Updated on 2026/06/16

写真a

 
AKAIKE, Yosui
 
News & Topics
Affiliation
Faculty of Science and Engineering, Waseda Research Institute for Science and Engineering
Job title
Researcher(Associate Professor)

Research Experience

  • 2020.04
    -
    Now

    Japan Aerospace Exploration Agency   Space Environment Utilization Center, Human Spaceflight Technology Directorate   Visiting researcher

  • 2020.04
    -
    Now

    Waseda University   Research Institute for Science and Engineering   Researcher, Associate Professor

  • 2018.02
    -
    2020.03

    University of Maryland Baltimore County, NASA/GSFC/CRESST   Assistant Research Scientist

  • 2016.02
    -
    2018.02

    NASA Goddard Space Flight Center   Astroparticle Physics Laboratory   JSPS Overseas Research Fellow

  • 2015.04
    -
    2016.02

    Waseda University   School of Advanced Science and Engineering   Research Associate

  • 2012.04
    -
    2015.03

    The University of Tokyo   Institute for Cosmic Ray Research   JSPS Research Fellow PD

  • 2009.04
    -
    2012.03

    Waseda University   Faculty of Science and Engineering   JSPS Research Fellow DC1

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Research Areas

  • Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics / Space and planetary sciences / Astronomy

Awards

  • ICRC2025 Best Poster Prize

    2025.07   ICPAP Commission C4   Precise Measurements of the Electron plus Positron Spectrum with CALET on the International Space Station

    Winner： Y. Akaike

  • 2018 ISS Award for Compelling Results

    2018.07   The American Astronautical Society   Compelling Results in Physical Science and Material Development

    Winner： CALET team

 

Papers

  • Precision Spectral Measurements of Chromium and Titanium from 10 to 250 GeV/n and Sub-Iron to Iron Ratio with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, P. Betti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, M. Mattiazzi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, M. Negro, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   135 ( 2 )  2025.07  [Refereed]

    Authorship：Corresponding author

    　View Summary

    The Calorimetric Electron Telescope (CALET), in operation on the International Space Station since 2015, collected a large sample of cosmic-ray (CR) iron and sub-iron events over a wide energy interval. In this Letter, we report an update of our previous measurement of the iron flux and we present—for the first time—a high statistics measurement of the spectra of two sub-iron elements Cr and Ti in the energy interval from 10 to 250  GeV/n. The analyses are based on 8 years of data. Differently from older generations of cosmic-ray instruments which, in most cases, could not resolve individual sub-iron elements, CALET can identify each nuclear species from proton to nickel (and beyond) with a measurement of their electric charge. Thanks to the improvement in statistics and a more refined assessment of systematic uncertainties, the iron spectral shape is better resolved, at high energy, than in our previous paper, and we report its flux ratio to chromium and titanium. The measured fluxes of Cr and Ti show energy dependences compatible with a single power law with spectral indices −2.74±0.06 and −2.88±0.06, respectively.

    DOI

    Scopus

    1
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    (Scopus)

  • Direct Measurement of the Spectral Structure of Cosmic-Ray Electrons + Positrons in the TeV Region with CALET on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   131 ( 19 )  2023.11  [Refereed]

    Authorship：Corresponding author

    DOI

  • Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   130 ( 21 )  2023.05  [Refereed]

    Authorship：Corresponding author

    DOI

  • Direct Measurement of the Cosmic-Ray Helium Spectrum from 40 GeV to 250 TeV with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   130 ( 17 )  2023.04  [Refereed]

    DOI

  • Cosmic-ray Boron Flux Measured from 8.4 GeV/n to 3.8 TeV/n with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   129 ( 25 )  2022.12  [Refereed]

    Authorship：Corresponding author

    　View Summary

    We present the measurement of the energy dependence of the boron flux in cosmic rays and its ratio to the carbon flux in an energy interval from 8.4 GeV/n to 3.8 TeV/n based on the data collected by the Calorimetric Electron Telescope (CALET) during ∼6.4 yr of operation on the International Space Station. An update of the energy spectrum of carbon is also presented with an increase in statistics over our previous measurement. The observed boron flux shows a spectral hardening at the same transition energy E0∼200 GeV/n of the C spectrum, though B and C fluxes have different energy dependences. The spectral index of the B spectrum is found to be γ=-3.047±0.024 in the interval 25<E<200 GeV/n. The B spectrum hardens by ΔγB=0.25±0.12, while the best fit value for the spectral variation of C is ΔγC=0.19±0.03. The B/C flux ratio is compatible with a hardening of 0.09±0.05, though a single power-law energy dependence cannot be ruled out given the current statistical uncertainties. A break in the B/C ratio energy dependence would support the recent AMS-02 observations that secondary cosmic rays exhibit a stronger hardening than primary ones. We also perform a fit to the B/C ratio with a leaky-box model of the cosmic-ray propagation in the Galaxy in order to probe a possible residual value λ0 of the mean escape path length λ at high energy. We find that our B/C data are compatible with a nonzero value of λ0, which can be interpreted as the column density of matter that cosmic rays cross within the acceleration region.

    DOI PubMed

  • SuperTIGER instrument abundances of galactic cosmic rays for the charge interval 41 < Z < 56

    Nathan Elliot Walsh, Yosui Akaike, Walter Robert Binns, Richard G. Bose, Terri J. Brandt, Dana L. Braun, Nicholas W. Cannady, Paul F. Dowkontt, Thomas Hams, Martin H. Israel, John F. Krizmanic, Allan W. Labrador, Richard A. Mewaldt, John W. Mitchell, Ryan P. Murphy, Georgia A. de Nolfo, Scott Nutter, Martin A. Olevitch, Brian F. Rauch, Kenichi Sakai, Makoto Sasaki, Garry E. Simburger, Ed C. Stone, Teresa Tatoli, John Ennis Ward, Mark E. Wiedenbeck, Wolfgang Zober

    ADVANCES IN SPACE RESEARCH   70 ( 9 ) 2666 - 2673  2022.11  [Refereed]

    　View Summary

    We report preliminary elemental abundance results from the 55-day long-duration-balloon flight of SuperTIGER (Super Trans-Iron Galactic Element Recorder) during the 2012-2013 austral summer. SuperTIGER measured the relative abundances of Galactic cosmic -ray (GCR) nuclei with high statistical precision and well resolved individual element peaks from 10Ne to 40Zr. SuperTIGER also made exploratory measurements of the relative abundances up to 56Ba. Although the statistics are low for elements heavier than 40Zr, we pre-sent, for the first time, relative abundance measurements of charges Z = 41 -56 with individual element resolution. GCR measurements up to 40Zr support a source acceleration model where supernovae in OB associations preferentially accelerate refractory elements that are more readily embedded in interstellar dust grains than volatiles. In addition, injection into the GCR for both refractory and volatile ele-ments appears to follow a charge dependence consistent with their grain sputtering cross sections. By extending the GCR measurement range past 40Zr, we can begin to further constrain these models. (c) 2022 COSPAR. Published by Elsevier B.V. All rights reserved.

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  • Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. de Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   129 ( 10 )  2022.09  [Refereed]

    DOI

  • CALET Search for Electromagnetic Counterparts of Gravitational Waves during the LIGO/Virgo O3 Run

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. de Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    The Astrophysical Journal   933 ( 1 ) 85 - 85  2022.07  [Refereed]

    　View Summary

    Abstract

    The CALorimetric Electron Telescope (CALET) on the International Space Station consists of a high-energy cosmic-ray CALorimeter (CAL) and a lower-energy CALET Gamma-ray Burst Monitor (CGBM). CAL is sensitive to electrons up to 20 TeV, cosmic-ray nuclei from Z = 1 through Z ∼ 40, and gamma rays over the range 1 GeV–10 TeV. CGBM observes gamma rays from 7 keV to 20 MeV. The combined CAL-CGBM instrument has conducted a search for gamma-ray bursts (GRBs) since 2015 October. We report here on the results of a search for X-ray/gamma-ray counterparts to gravitational-wave events reported during the LIGO/Virgo observing run O3. No events have been detected that pass all acceptance criteria. We describe the components, performance, and triggering algorithms of the CGBM—the two Hard X-ray Monitors consisting of LaBr3(Ce) scintillators sensitive to 7 keV–1 MeV gamma rays and a Soft Gamma-ray Monitor BGO scintillator sensitive to 40 keV–20 MeV—and the high-energy CAL consisting of a charge detection module, imaging calorimeter, and the fully active total absorption calorimeter. The analysis procedure is described and upper limits to the time-averaged fluxes are presented.

    DOI

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  • Direct Measurement of the Nickel Spectrum in Cosmic Rays in the Energy Range from 8.8 GeV/ n to 240 GeV/ n with CALET on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical Review Letters   128 ( 13 )  2022.04  [Refereed]

    Authorship：Corresponding author

    　View Summary

    The relative abundance of cosmic ray nickel nuclei with respect to iron is by far larger than for all other transiron elements; therefore it provides a favorable opportunity for a low background measurement of its spectrum. Since nickel, as well as iron, is one of the most stable nuclei, the nickel energy spectrum and its relative abundance with respect to iron provide important information to estimate the abundances at the cosmic ray source and to model the Galactic propagation of heavy nuclei. However, only a few direct measurements of cosmic-ray nickel at energy larger than ∼3 GeV/n are available at present in the literature, and they are affected by strong limitations in both energy reach and statistics. In this Letter, we present a measurement of the differential energy spectrum of nickel in the energy range from 8.8 to 240 GeV/n, carried out with unprecedented precision by the Calorimetric Electron Telescope (CALET) in operation on the International Space Station since 2015. The CALET instrument can identify individual nuclear species via a measurement of their electric charge with a dynamic range extending far beyond iron (up to atomic number Z=40). The particle's energy is measured by a homogeneous calorimeter (1.2 proton interaction lengths, 27 radiation lengths) preceded by a thin imaging section (3 radiation lengths) providing tracking and energy sampling. This Letter follows our previous measurement of the iron spectrum [1O. Adriani (CALET Collaboration), Phys. Rev. Lett. 126, 241101 (2021).PRLTAO0031-900710.1103/PhysRevLett.126.241101], and it extends our investigation on the energy dependence of the spectral index of heavy elements. It reports the analysis of nickel data collected from November 2015 to May 2021 and a detailed assessment of the systematic uncertainties. In the region from 20 to 240 GeV/n our present data are compatible within the errors with a single power law with spectral index -2.51±0.07.

    DOI PubMed

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  • Measurement of the Iron Spectrum in Cosmic Rays from 10 GeV/n to 2.0 TeV/n with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, J. Link, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Physical Review Letters   126 ( 24 )  2021.06  [Refereed]

    Authorship：Corresponding author

    　View Summary

    The Calorimetric Electron Telescope (CALET), in operation on the International Space Station since 2015, collected a large sample of cosmic-ray iron over a wide energy interval. In this Letter a measurement of the iron spectrum is presented in the range of kinetic energy per nucleon from 10 GeV/n to 2.0 TeV/n allowing the inclusion of iron in the list of elements studied with unprecedented precision by space-borne instruments. The measurement is based on observations carried out from January 2016 to May 2020. The CALET instrument can identify individual nuclear species via a measurement of their electric charge with a dynamic range extending far beyond iron (up to atomic number Z=40). The energy is measured by a homogeneous calorimeter with a total equivalent thickness of 1.2 proton interaction lengths preceded by a thin (3 radiation lengths) imaging section providing tracking and energy sampling. The analysis of the data and the detailed assessment of systematic uncertainties are described and results are compared with the findings of previous experiments. The observed differential spectrum is consistent within the errors with previous experiments. In the region from 50 GeV/n to 2 TeV/n our present data are compatible with a single power law with spectral index -2.60±0.03.

    DOI PubMed

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    75
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  • Direct Measurement of the Cosmic-Ray Carbon and Oxygen Spectra from 10 GeV/ n to 2.2 TeV/ n with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, J. Link, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, F. Palma, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, S. Sugita, J. E. Suh, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Physical Review Letters   125 ( 25 )  2020.12  [Refereed]

    Authorship：Corresponding author

    　View Summary

    In this paper, we present the measurement of the energy spectra of carbon and oxygen in cosmic rays based on observations with the Calorimetric Electron Telescope on the International Space Station from October 2015 to October 2019. Analysis, including the detailed assessment of systematic uncertainties, and results are reported. The energy spectra are measured in kinetic energy per nucleon from 10 GeV/n to 2.2 TeV/n with an all-calorimetric instrument with a total thickness corresponding to 1.3 nuclear interaction length. The observed carbon and oxygen fluxes show a spectral index change of ∼0.15 around 200 GeV/n established with a significance >3σ. They have the same energy dependence with a constant C/O flux ratio 0.911±0.006 above 25 GeV/n. The spectral hardening is consistent with that measured by AMS-02, but the absolute normalization of the flux is about 27% lower, though in agreement with observations from previous experiments including the PAMELA spectrometer and the calorimetric balloon-borne experiment CREAM.

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  • Direct Measurement of the Cosmic-Ray Proton Spectrum from 50 GeV to 10 TeV with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, J. E. Suh, A. Sulaj, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, T. Terasawa, H. Tomida, S. Torii, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Physical Review Letters   122 ( 18 )  2019.05  [Refereed]

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    213
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  • Measurements of Heavy Cosmic-Ray Nuclei Spectra with CALET on the ISS

    Yosui Akaike

    26TH EXTENDED EUROPEAN COSMIC RAY SYMPOSIUM   1181  2019  [Refereed]

    Authorship：Lead author

    　View Summary

    CALorimetric Electron Telescope (CALET) has been accumulating data of high-energy cosmic rays on the International Space Station since August 2015. In addition to the primary observation of the all-electron spectra, CALET also measures the spectra of nuclei, their relative abundances and secondary-to-primary ratios to the highest energy region ever directly observed in order to investigate details of their origin and propagation in the galaxy. The CALET instrument consists of two layers of segmented plastic scintillators to identify the individual elements from Z = 1 to 40, a 3 radiation length thick tungsten-scintillating fiber imaging calorimeter to obtain complementary charge and tracking information, and a 27 radiation length thick segmented PWO calorimeter to measure the energy. In this paper, the capability of CALET to perform nuclei measurements and preliminary energy spectra of heavy nuclei components using 962 days of data is presented.

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  • Characteristics and Performance of the CALorimetric Electron Telescope (CALET) Calorimeter for Gamma-Ray Observations

    N. Cannady, Y. Asaoka, F. Satoh, M. Tanaka, S. Torii, M. L. Cherry, M. Mori, O. Adriani, Y. Akaike, K. Asano, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, G. Castellini, C. Checchia, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, K. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A.De Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, J. E. Suh, A. Sulaj, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Astrophysical Journal, Supplement Series   238 ( 1 )  2018.09  [Refereed]

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    33
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  • Search for GeV Gamma-Ray Counterparts of Gravitational Wave Events by CALET

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, H. S. Krawczynski, J. F. Krizmanic, K. Kohri, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, J. E. Suh, A. Sulaj, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Astrophysical Journal   863 ( 2 )  2018.08  [Refereed]

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    30
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  • On-orbit operations and offline data processing of CALET onboard the ISS

    Y. Asaoka, S. Ozawa, S. Torii, O. Adriani, Y. Akaike, K. Asano, M. G. Bagliesi, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, A. Javaid, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, H. S. Krawczynski, J. F. Krizmanic, S. Kuramata, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, K. Mizutani, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. de Nolfo, S. Okuno, J. F. Ormes, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    Astroparticle Physics   100   29 - 37  2018.07  [Refereed]

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  • Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, J. E. Suh, A. Sulaj, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Physical Review Letters   120 ( 26 )  2018.06  [Refereed]

    DOI PubMed

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    225
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  • Energy Spectrum of Cosmic-Ray Electron and Positron from 10 GeV to 3 TeV Observed with the Calorimetric Electron Telescope on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, A. Javaid, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, H. S. Krawczynski, J. F. Krizmanic, S. Kuramata, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, K. Mizutani, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    Physical Review Letters   119 ( 18 )  2017.11  [Refereed]

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    197
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  • Relativistic electron precipitation at International Space Station: Space weather monitoring by Calorimetric Electron Telescope

    Ryuho Kataoka, Yoichi Asaoka, Shoji Torii, Toshio Terasawa, Shunsuke Ozawa, Tadahisa Tamura, Yuki Shimizu, Yosui Akaike, Masaki Mori

    GEOPHYSICAL RESEARCH LETTERS   43 ( 9 ) 4119 - 4125  2016.05  [Refereed]

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    34
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  • Energy calibration of Calorimetric Electron Telescope (CALET) in space

    Tae Niita, Shoji Torii, Yosui Akaike, Yoichi Asaoka, Katsuaki Kasahara, Shunsuke Ozawa, Tadahisa Tamura

    ADVANCES IN SPACE RESEARCH   55 ( 11 ) 2500 - 2508  2015.06  [Refereed]

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    27
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  • A balloon experiment using CALET prototype (bCALET-2)

    Tae Niita, Shoji Torii, Katsuaki Kasahara, Hiroyuki Murakami, Shunsuke Ozawa, Yoshitaka Ueyama, Yosui Akaike, Tadahisa Tamura, Kenji Yoshida, Yusaku Katayose, Yuki Shimizu, Hideyuki Fuke

    ADVANCES IN SPACE RESEARCH   55 ( 2 ) 753 - 760  2015.01  [Refereed]

    DOI J-GLOBAL

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    3
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  • Beam test performance of a scintillator-based detector for the charge identification of relativistic ions

    P. S. Marrocchesi, O. Adriani, Y. Akaike, M. G. Bagliesi, A. Basti, G. Bigongiari, S. Bonechi, M. Bongi, M. Y. Kim, T. Lomtadze, P. Maestro, T. Niita, S. Ozawa, Y. Shimizu, S. Torii

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   659 ( 1 ) 477 - 483  2011.12  [Refereed]

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  • Simulated performance of the calorimetric electron telescope (CALET) experiment

    Y. Akaike, K. Taira, K. Kasahara, S. Torii, Y. Shimizu, K. Yoshida

    ADVANCES IN SPACE RESEARCH   45 ( 5 ) 690 - 697  2010.03  [Refereed]

    Authorship：Lead author

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    8
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  • Expected performance of CALET by Monte carlo simulation

    Y. Akaike, K. Kasahara, S. Torii, Y. Shimizij, K. Taira, K. Yoshida, I. Watanabe

    Journal of the Physical Society of Japan   78 ( SUPPL. A ) 169 - 172  2009  [Refereed]

    Authorship：Lead author

    DOI

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    1
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  • Balloon borne experiment with CALET prototype

    Y. Shimizu, S. Torii, K. Kasahara, Y. Akaike, Y. Fukuta, K. Hidaka, K. Taira, T. Tamura, K. Yoshida, Y. Katayose, H. Murakami

    Journal of the Physical Society of Japan   78 ( Suppl.A ) 165 - 168  2009  [Refereed]

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    4
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  • Charge–Sign Dependent Drift Effects in the Time–Lag of Cosmic–Ray Variation Relative to Solar Activity Observed with the Calorimetric Electron Telescope (CALET)

    O Adriani, Y Akaike, K Asano, Y Asaoka, E Berti, P Betti, G Bigongiari, W R Binns, L W Blum, M Bongi, P Brogi, A Bruno, N Cannady, G Castellini, C Checchia, M L Cherry, G Collazuol, G A de Nolfo, K Ebisawa, A W Ficklin, H Fuke, S Gonzi, T G Guzik, T Hams, K Hibino, M Ichimura, M H Israel, K Kasahara, J Kataoka, R Kataoka, Y Katayose, C Kato, Y Kato, N Kawanaka, Y Kawakubo, K Kobayashi, K Kohri, H S Krawczynski, J F Krizmanic, P Maestro, P S Marrocchesi, M Mattiazzi, A M Messineo, J W Mitchell, S Miyake, A A Moiseev, M Mori, N Mori, H M Motz, K Munakata, S Nakahira, M Negro, J Nishimura, S Okuno, J F Ormes, S Ozawa, L Pacini, P Papini, A Picquenot, B F Rauch, S B Ricciarini, K Sakai, T Sakamoto, M Sasaki, Y Shimizu, A Shiomi, P Spillantini, F Stolzi, S Sugita, M Takita, T Tamura, M Teramoto, T Terasawa, S Torii, Y Tsunesada, Y Uchihori, E Vannuccini, J P Wefel, K Yamaoka, S Yanagita, A Yoshida, K Yoshida, W V Zober

    Progress of Theoretical and Experimental Physics   2026 ( 3 ) 033F01  2026.02  [Refereed]

    　View Summary

    Abstract

    The 11-yr variation of galactic cosmic-ray flux lags behind the variation of the sunspot number. An average $\sim$1-yr time-lag is expected from the outward propagating solar wind with the frozen-in photospheric magnetic field varying in the solar cycle, and from the inward diffusive transport of cosmic-ray particles. The long-term neutron monitor data, however, show that the time-lag is significantly longer (shorter) in the odd (even) solar cycle. In this paper, we analyze the time-lag in proton and electron fluxes observed by the Calorimetric Electron Telescope (CALET). It is found that the time-lag is similar in proton and electron fluxes during an $A &amp;gt; 0$ polarity epoch of the solar dipole magnetic field. In an even solar cycle 24 including a polarity reversal from $A &amp;lt; 0$ to $A &amp;gt; 0$, on the other hand, it is found that the time-lag of proton (electron) flux variation is significantly shorter (longer) than the average $\sim$1-yr lag by analyzing the combined data with CALET and AMS-02. This is the first observation of the charge-sign dependent time-lag. We demonstrate that these observations can be qualitatively interpreted in terms of different 11-yr time profiles of proton and electron fluxes in $A &amp;gt; 0$ and $A &amp;lt; 0$ epochs expected from the drift effect.

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  • Effects of the May 2024 Solar Storm on the Earth's Radiation Belts Observed by CALET on the International Space Station

    A.Ficklin, A.Bruno, L.Blum, N.W.Cannady, T.G.Guzik, O.Adriani, Y.Akaike, K.Asano, Y.Asaoka, E.Berti, P.Betti, G.Bigongiari, W.R.Binns, M.Bongi, P.Brogi, A.Bruno, N.Cannady, G.Castellini, C.Checchia, M.L.Cherry, G.Collazuol, K.Ebisawa, A.W.Ficklin, H.Fuke, S.Gonzi, T.G.Guzik, T.Hams, K.Hibino, M.Ichimura, M.H.Israel, K.Kasahara, J.Kataoka, R.Kataoka, Y.Katayose, C.Kato, N.Kawanaka, Y.Kawakubo, K.Kobayashi, K.Kohri, H.S.Krawczynski, J.F.Krizmanic, P.Maestro, P.S.Marrocchesi, M.Mattiazzi, A.M.Messineo, J.W.Mitchell, S.Miyake, A.A.Moiseev, M.Mori, N.Mori, H.Motz, K.Munakata, S.Nakahira, M.Negro, G.A.deNolfo, J.Nishimura, S.Okuno, J.F.Ormes, S.Ozawa, L.Pacini, P.Papini, B.F.Rauch, S.B.Ricciarini, K.Sakai, T.Sakamoto, M.Sasaki, Y.Shimizu, A.Shiomi, P.Spillantini, F.Stolzi, S.Sugita, A.Sulaj, M.Takita, T.Tamura, T.Terasawa, S.Torii, Y.Tsunesada, Y.Uchihori, E.Vannuccini, J.P.Wefel, K.Yamaoka, S.Yanagita, A.Yoshida, K.Yoshida, W.V.Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     1293 - 1293  2025.09

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  • Cosmic-ray modulation over the past 10 years observed with CALET on the International Space Station

    S.Miyake, K.Munakata, C.Kato, Y.Akaike, K.Kobayashi, S.Torii, R.Kataoka, T.Terasawa, O.Adriani, Y.Akaike, K.Asano, Y.Asaoka, E.Berti, P.Betti, G.Bigongiari, W.R.Binns, M.Bongi, P.Brogi, A.Bruno, N.Cannady, G.Castellini, C.Checchia, M.L.Cherry, G.Collazuol, K.Ebisawa, A.W.Ficklin, H.Fuke, S.Gonzi, T.G.Guzik, T.Hams, K.Hibino, M.Ichimura, M.H.Israel, K.Kasahara, J.Kataoka, R.Kataoka, Y.Katayose, C.Kato, N.Kawanaka, Y.Kawakubo, K.Kobayashi, K.Kohri, H.S.Krawczynski, J.F.Krizmanic, P.Maestro, P.S.Marrocchesi, M.Mattiazzi, A.M.Messineo, J.W.Mitchell, S.Miyake, A.A.Moiseev, M.Mori, N.Mori, H.Motz, K.Munakata, S.Nakahira, M.Negro, G.A.deNolfo, J.Nishimura, S.Okuno, J.F.Ormes, S.Ozawa, L.Pacini, P.Papini, B.F.Rauch, S.B.Ricciarini, K.Sakai, T.Sakamoto, M.Sasaki, Y.Shimizu, A.Shiomi, P.Spillantini, F.Stolzi, S.Sugita, A.Sulaj, M.Takita, T.Tamura, T.Terasawa, S.Torii, Y.Tsunesada, Y.Uchihori, E.Vannuccini, J.P.Wefel, K.Yamaoka, S.Yanagita, A.Yoshida, K.Yoshida, W.V.Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     1337 - 1337  2025.09

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  • Nine years of gamma-ray burst observations with the CALET Gamma-ray Burst Monitor

    Y.Kawakubo, N.Cannady, T.Sakamoto, M.Cherry,O.Adriani, Y.Akaike, K.Asano, Y.Asaoka, E.Berti, P.Betti, G.Bigongiari, W.R.Binns, M.Bongi, P.Brogi, A.Bruno, N.Cannady, G.Castellini, C.Checchia, M.L.Cherry, G.Collazuol, K.Ebisawa, A.W.Ficklin, H.Fuke, S.Gonzi, T.G.Guzik, T.Hams, K.Hibino, M.Ichimura, M.H.Israel, K.Kasahara, J.Kataoka, R.Kataoka, Y.Katayose, C.Kato, N.Kawanaka, Y.Kawakubo, K.Kobayashi, K.Kohri, H.S.Krawczynski, J.F.Krizmanic, P.Maestro, P.S.Marrocchesi, M.Mattiazzi, A.M.Messineo, J.W.Mitchell, S.Miyake, A.A.Moiseev, M.Mori, N.Mori, H.Motz, K.Munakata, S.Nakahira, M.Negro, G.A.deNolfo, J.Nishimura, S.Okuno, J.F.Ormes, S.Ozawa, L.Pacini, P.Papini, B.F.Rauch, S.B.Ricciarini, K.Sakai, T.Sakamoto, M.Sasaki, Y.Shimizu, A.Shiomi, P.Spillantini, F.Stolzi, S.Sugita, A.Sulaj, M.Takita, T.Tamura, T.Terasawa, S.Torii, Y.Tsunesada, Y.Uchihori, E.Vannuccini, J.P.Wefel, K.Yamaoka, S.Yanagita, A.Yoshida, K.Yoshida, W.V.Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     937 - 937  2025.09

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  • Improving electron/proton discrimination at high energies with CALET on the International Space Station

    S.Gonzi, E.Berti, P.Betti, L.Pacini, O.Adriani, Y.Akaike, K.Asano, Y.Asaoka, E.Berti, P.Betti, G.Bigongiari, W.R.Binns, M.Bongi, P.Brogi, A.Bruno, N.Cannady, G.Castellini, C.Checchia, M.L.Cherry, G.Collazuol, K.Ebisawa, A.W.Ficklin, H.Fuke, S.Gonzi, T.G.Guzik, T.Hams, K.Hibino, M.Ichimura, M.H.Israel, K.Kasahara, J.Kataoka, R.Kataoka, Y.Katayose, C.Kato, N.Kawanaka, Y.Kawakubo, K.Kobayashi, K.Kohri, H.S.Krawczynski, J.F.Krizmanic, P.Maestro, P.S.Marrocchesi, M.Mattiazzi, A.M.Messineo, J.W.Mitchell, S.Miyake, A.A.Moiseev, M.Mori, N.Mori, H.Motz, K.Munakata, S.Nakahira, M.Negro, G.A.deNolfo, J.Nishimura, S.Okuno, J.F.Ormes, S.Ozawa, L.Pacini, P.Papini, B.F.Rauch, S.B.Ricciarini, K.Sakai, T.Sakamoto, M.Sasaki, Y.Shimizu, A.Shiomi, P.Spillantini, F.Stolzi, S.Sugita, A.Sulaj, M.Takita, T.Tamura, T.Terasawa, S.Torii, Y.Tsunesada, Y.Uchihori, E.Vannuccini, J.P.Wefel, K.Yamaoka, S.Yanagita, A.Yoshida, K.Yoshida, W.V.Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     011 - 011  2025.09

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  • Characterisation of backscattering effects in CALET due to hadronic showers generated in the calorimeter

    A.Foresi, P.Maestro, O.Adriani, Y.Akaike, K.Asano, Y.Asaoka, E.Berti, P.Betti, G.Bigongiari, W.R.Binns, M.Bongi, P.Brogi, A.Bruno, N.Cannady, G.Castellini, C.Checchia, M.L.Cherry, G.Collazuol, K.Ebisawa, A.W.Ficklin, H.Fuke, S.Gonzi, T.G.Guzik, T.Hams, K.Hibino, M.Ichimura, M.H.Israel, K.Kasahara, J.Kataoka, R.Kataoka, Y.Katayose, C.Kato, N.Kawanaka, Y.Kawakubo, K.Kobayashi, K.Kohri, H.S.Krawczynski, J.F.Krizmanic, P.Maestro, P.S.Marrocchesi, M.Mattiazzi, A.M.Messineo, J.W.Mitchell, S.Miyake, A.A.Moiseev, M.Mori, N.Mori, H.Motz, K.Munakata, S.Nakahira, M.Negro, G.A.deNolfo, J.Nishimura, S.Okuno, J.F.Ormes, S.Ozawa, L.Pacini, P.Papini, B.F.Rauch, S.B.Ricciarini, K.Sakai, T.Sakamoto, M.Sasaki, Y.Shimizu, A.Shiomi, P.Spillantini, F.Stolzi, S.Sugita, A.Sulaj, M.Takita, T.Tamura, T.Terasawa, S.Torii, Y.Tsunesada, Y.Uchihori, E.Vannuccini, J.P.Wefel, K.Yamaoka, S.Yanagita, A.Yoshida, K.Yoshida, W.V.Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     039 - 039  2025.09

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  • CALET on-orbit operations and data calibration for 10 years observation on the International Space Station

    K.Kobayashi, T.Tamura, Y.Akaike, O.Adriani, Y.Akaike, K.Asano, Y.Asaoka, E.Berti, P.Betti, G.Bigongiari, W.R.Binns, M.Bongi, P.Brogi, A.Bruno, N.Cannady, G.Castellini, C.Checchia, M.L.Cherry, G.Collazuol, K.Ebisawa, A.W.Ficklin, H.Fuke, S.Gonzi, T.G.Guzik, T.Hams, K.Hibino, M.Ichimura, M.H.Israel, K.Kasahara, J.Kataoka, R.Kataoka, Y.Katayose, C.Kato, N.Kawanaka, Y.Kawakubo, K.Kobayashi, K.Kohri, H.S.Krawczynski, J.F.Krizmanic, P.Maestro, P.S.Marrocchesi, M.Mattiazzi, A.M.Messineo, J.W.Mitchell, S.Miyake, A.A.Moiseev, M.Mori, N.Mori, H.Motz, K.Munakata, S.Nakahira, M.Negro, G.A.deNolfo, J.Nishimura, S.Okuno, J.F.Ormes, S.Ozawa, L.Pacini, P.Papini, B.F.Rauch, S.B.Ricciarini, K.Sakai, T.Sakamoto, M.Sasaki, Y.Shimizu, A.Shiomi, P.Spillantini, F.Stolzi, S.Sugita, A.Sulaj, M.Takita, T.Tamura, T.Terasawa, S.Torii, Y.Tsunesada, Y.Uchihori, E.Vannuccini, J.P.Wefel, K.Yamaoka, S.Yanagita, A.Yoshida, K.Yoshida, W.V.Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     058 - 058  2025.09

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  • Boosted-Decision-Trees based analysis for the measurement of light elements fluxes with CALET

    M.Mattiazzi, P.Brogi, O.Adriani, Y.Akaike, K.Asano, Y.Asaoka, E.Berti, P.Betti, G.Bigongiari, W.R.Binns, M.Bongi, P.Brogi, A.Bruno, N.Cannady, G.Castellini, C.Checchia, M.L.Cherry, G.Collazuol, K.Ebisawa, A.W.Ficklin, H.Fuke, S.Gonzi, T.G.Guzik, T.Hams, K.Hibino, M.Ichimura, M.H.Israel, K.Kasahara, J.Kataoka, R.Kataoka, Y.Katayose, C.Kato, N.Kawanaka, Y.Kawakubo, K.Kobayashi, K.Kohri, H.S.Krawczynski, J.F.Krizmanic, P.Maestro, P.S.Marrocchesi, M.Mattiazzi, A.M.Messineo, J.W.Mitchell, S.Miyake, A.A.Moiseev, M.Mori, N.Mori, H.Motz, K.Munakata, S.Nakahira, M.Negro, G.A.deNolfo, J.Nishimura, S.Okuno, J.F.Ormes, S.Ozawa, L.Pacini, P.Papini, B.F.Rauch, S.B.Ricciarini, K.Sakai, T.Sakamoto, M.Sasaki, Y.Shimizu, A.Shiomi, P.Spillantini, F.Stolzi, S.Sugita, A.Sulaj, M.Takita, T.Tamura, T.Terasawa, S.Torii, Y.Tsunesada, Y.Uchihori, E.Vannuccini, J.P.Wefel, K.Yamaoka, S.Yanagita, A.Yoshida, K.Yoshida, W.V.Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     083 - 083  2025.09

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  • Progress Toward Reproducing the GeV Galactic Center Excess Using CALET Data

    A.Coleman, W.V.Zober, M.Negro, N.W.Cannady, B.Rauch, O.Adriani, Y.Akaike, K.Asano, Y.Asaoka, E.Berti, P.Betti, G.Bigongiari, W.R.Binns, M.Bongi, P.Brogi, A.Bruno, N.Cannady, G.Castellini, C.Checchia, M.L.Cherry, G.Collazuol, K.Ebisawa, A.W.Ficklin, H.Fuke, S.Gonzi, T.G.Guzik, T.Hams, K.Hibino, M.Ichimura, M.H.Israel, K.Kasahara, J.Kataoka, R.Kataoka, Y.Katayose, C.Kato, N.Kawanaka, Y.Kawakubo, K.Kobayashi, K.Kohri, H.S.Krawczynski, J.F.Krizmanic, P.Maestro, P.S.Marrocchesi, M.Mattiazzi, A.M.Messineo, J.W.Mitchell, S.Miyake, A.A.Moiseev, M.Mori, N.Mori, H.Motz, K.Munakata, S.Nakahira, M.Negro, G.A.deNolfo, J.Nishimura, S.Okuno, J.F.Ormes, S.Ozawa, L.Pacini, P.Papini, B.F.Rauch, S.B.Ricciarini, K.Sakai, T.Sakamoto, M.Sasaki, Y.Shimizu, A.Shiomi, P.Spillantini, F.Stolzi, S.Sugita, A.Sulaj, M.Takita, T.Tamura, T.Terasawa, S.Torii, Y.Tsunesada, Y.Uchihori, E.Vannuccini, J.P.Wefel, K.Yamaoka, S.Yanagita, A.Yoshida, K.Yoshida, W.V.Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     613 - 613  2025.09

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  • Energy spectra and flux ratios of BCNO cosmic-ray nuclei measured by CALET up to multi-TeV energies

    P.Maestro, O.Adriani, Y.Akaike, K.Asano, Y.Asaoka, E.Berti, P.Betti, G.Bigongiari, W.R.Binns, M.Bongi, P.Brogi, A.Bruno, N.Cannady, G.Castellini, C.Checchia, M.L.Cherry, G.Collazuol, K.Ebisawa, A.W.Ficklin, H.Fuke, S.Gonzi, T.G.Guzik, T.Hams, K.Hibino, M.Ichimura, M.H.Israel, K.Kasahara, J.Kataoka, R.Kataoka, Y.Katayose, C.Kato, N.Kawanaka, Y.Kawakubo, K.Kobayashi, K.Kohri, H.S.Krawczynski, J.F.Krizmanic, P.Maestro, P.S.Marrocchesi, M.Mattiazzi, A.M.Messineo, J.W.Mitchell, S.Miyake, A.A.Moiseev, M.Mori, N.Mori, H.Motz, K.Munakata, S.Nakahira, M.Negro, G.A.deNolfo, J.Nishimura, S.Okuno, J.F.Ormes, S.Ozawa, L.Pacini, P.Papini, B.F.Rauch, S.B.Ricciarini, K.Sakai, T.Sakamoto, M.Sasaki, Y.Shimizu, A.Shiomi, P.Spillantini, F.Stolzi, S.Sugita, A.Sulaj, M.Takita, T.Tamura, T.Terasawa, S.Torii, Y.Tsunesada, Y.Uchihori, E.Vannuccini, J.P.Wefel, K.Yamaoka, S.Yanagita, A.Yoshida, K.Yoshida, W.V.Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     077 - 077  2025.09

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  • Extended measurement of the proton spectrum with CALET on the International Space Station

    K.Kobayashi, P.S.Marrocchesi, O.Adriani, Y.Akaike, K.Asano, Y.Asaoka, E.Berti, P.Betti, G.Bigongiari, W.R.Binns, M.Bongi, P.Brogi, A.Bruno, N.Cannady, G.Castellini, C.Checchia, M.L.Cherry, G.Collazuol, K.Ebisawa, A.W.Ficklin, H.Fuke, S.Gonzi, T.G.Guzik, T.Hams, K.Hibino, M.Ichimura, M.H.Israel, K.Kasahara, J.Kataoka, R.Kataoka, Y.Katayose, C.Kato, N.Kawanaka, Y.Kawakubo, K.Kobayashi, K.Kohri, H.S.Krawczynski, J.F.Krizmanic, P.Maestro, P.S.Marrocchesi, M.Mattiazzi, A.M.Messineo, J.W.Mitchell, S.Miyake, A.A.Moiseev, M.Mori, N.Mori, H.Motz, K.Munakata, S.Nakahira, M.Negro, G.A.deNolfo, J.Nishimura, S.Okuno, J.F.Ormes, S.Ozawa, L.Pacini, P.Papini, B.F.Rauch, S.B.Ricciarini, K.Sakai, T.Sakamoto, M.Sasaki, Y.Shimizu, A.Shiomi, P.Spillantini, F.Stolzi, S.Sugita, A.Sulaj, M.Takita, T.Tamura, T.Terasawa, S.Torii, Y.Tsunesada, Y.Uchihori, E.Vannuccini, J.P.Wefel, K.Yamaoka, S.Yanagita, A.Yoshida, K.Yoshida, W.V.Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     059 - 059  2025.09

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  • CALET's sensitivity to electron cosmic-ray spectral and anisotropy signatures of the Vela SNR

    Holger Motz, O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, P. Betti, G. Bigongiari, W.R. Binns, M. Bongi, P. Brogi, A. Bruno, N. Cannady, G. Castellini, C. Checchia, M.L. Cherry, G. Collazuol, K. Ebisawa, A.W. Ficklin, H. Fuke, S. Gonzi, T.G. Guzik, T. Hams, K. Hibino, M. Ichimura, M.H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H.S. Krawczynski, J.F. Krizmanic, P. Maestro, P.S. Marrocchesi, M. Mattiazzi, A.M. Messineo, J.W. Mitchell, S. Miyake, A.A. Moiseev, M. Mori, N. Mori, K. Munakata, S. Nakahira, M. Negro, G.A. de Nolfo, J. Nishimura, S. Okuno, J.F. Ormes, S. Ozawa, L. Pacini, P. Papini, B.F. Rauch, S.B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J.P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W.V. Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     099 - 099  2025.09

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  • A deep learning method for event recognition in CALET data

    Adrien Picquenot, Michela Negro, Nicholas W Cannady, O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, P. Betti, G. Bigongiari, W.R. Binns, M. Bongi, P. Brogi, A. Bruno, G. Castellini, C. Checchia, M.L. Cherry, G. Collazuol, G.A. deNolfo, K. Ebisawa, A.W. Ficklin, H. Fuke, S. Gonzi, T.G. Guzik, T. Hams, K. Hibino, M. Ichimura, M.H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H.S. Krawczynski, John Krizmanic, P. Maestro, P.S. Marrocchesi, M. Mattiazzi, A.M. Messineo, J.W. Mitchell, S. Miyake, A.A. Moiseev, M. Mori, N. Mori, H.M. Motz, K. Munakata, S. Nakahira, J. Nishimura, S. Okuno, J.F. Ormes, S. Ozawa, L. Pacini, P. Papini, B.F. Rauch, S.B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J.P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W.V. Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     113 - 113  2025.09

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  • Updated Limits on Anisotropy in Electron+Positron Cosmic Rays from CALET Data

    Holger Motz, Yosui Akaike, O. Adriani, K. Asano, Y. Asaoka, E. Berti, P. Betti, G. Bigongiari, W.R. Binns, M. Bongi, P. Brogi, A. Bruno, N. Cannady, G. Castellini, C. Checchia, M.L. Cherry, G. Collazuol, K. Ebisawa, A.W. Ficklin, H. Fuke, S. Gonzi, T.G. Guzik, T. Hams, K. Hibino, M. Ichimura, M.H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H.S. Krawczynski, J.F. Krizmanic, P. Maestro, P.S. Marrocchesi, M. Mattiazzi, A.M. Messineo, J.W. Mitchell, S. Miyake, A.A. Moiseev, M. Mori, N. Mori, K. Munakata, S. Nakahira, M. Negro, G.A. de Nolfo, J. Nishimura, S. Okuno, J.F. Ormes, S. Ozawa, L. Pacini, P. Papini, B.F. Rauch, S.B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J.P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W.V. Zober

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     100 - 100  2025.09

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  • Measurement of Cr and Ti fluxes and sub-iron/iron flux ratios with CALET on the International Space Station

    Francesco Stolzi, Caterina Checchia, Yosui Akaike

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     136 - 136  2025.09

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  • Direct measurement of the all-particle spectrum up to the PeV region with CALET on the International Space Station

    Yosui Akaike, Shoji Torii, Kazuyoshi Kobayashi

    Proceedings of 39th International Cosmic Ray Conference — PoS(ICRC2025)     004 - 004  2025.09

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  • Detected Abundances of Nuclei Relative to 26Fe for Elements 14Si through 44Ru with CALET on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, P. Betti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, M. Mattiazzi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, M. Negro, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    The Astrophysical Journal   988 ( 2 ) 148 - 148  2025.07

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    Abstract

    The Calorimetric Electron Telescope (CALET), launched to the International Space Station (ISS) in 2015 August and continuously operating since, measures cosmic-ray (CR) electrons, nuclei, and gamma rays. CALET, with its 27 radiation length deep Total Absorption Calorimeter, measures particle energy and allows for the measurement of spectra, secondary to primary ratios of the more abundant CR nuclei through 28Ni, while the main charge detector can measure ultra-heavy CR nuclei through 44Ru. The results for the abundances of elements from Z = 14 to Z = 44 relative to 26Fe over 7.5 yr of observation are presented here and compared to previous measurements from ACE-CRIS, SuperTIGER, and HEAO-3.

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  • Exploring Outer Radiation Belt Losses From the International Space Station

    Xiao‐Jia Zhang, Anton Artemyev, Yuto Katoh, Yikai Hsieh, Vassilis Angelopoulos, Shoji Torii, Ryuho Kataoka, Yosui Akaike, Satoshi Nakahira

    Geophysical Research Letters    2025.07

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  • The iron and nickel spectra measured with CALET on the international space station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W.R. Binns, M. Bongi, P. Brogi, A. Bruno, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, M. Mattiazzi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. de Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    International Journal of Modern Physics A    2025.01

    　View Summary

    Recent direct measurements of the energy spectra of the charged cosmic ray have revealed unexpected spectral features, most notably the onset of a progressive hardening at few hundreds of GeV/n not only of proton and He spectra but also observable for heavier nuclei. Thus, the study of the spectra behavior of heavy elements may shed light on understanding propagation and acceleration phenomena in our Galaxy. In particular, Fe and Ni provide favorable conditions for observations thanks to the low background contamination from spallation of higher mass elements they are affected by. The CALorimetric Electron Telescope, CALET, has been measuring high-energy cosmic rays on the International Space Station since October 2015. The instrument consists of two layers of segmented plastic scintillators, a 3 radiation length thick tungsten-scintillating fiber imaging calorimeter and a 27 radiation length thick PWO calorimeter. It identifies the charge of individual elements up to Ni and beyond and it measures the energy of cosmic-ray nuclei providing a direct measurement of their spectra. In this contribution, the iron and nickel spectra, resulted after 5 years of data acquisition, are presented in the energy range between 10 and 2000 GeV/n and between 8.8 and 240 GeV/n, respectively. The analysis procedure and the assessment of systematic errors are detailed, in addition to the ratio between the two fluxes. Both spectra show similar shape and energy dependence.

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  • The Calorimetric Electron Telescope (CALET) on the International Space Station: Results from the first eight years on orbit

    Y. Akaike, O. Adriani, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W.R. Binns, M. Bongi, P. Brogi, A. Bruno, N. Cannady, G. Castellini, C. Checchia, M.L. Cherry, G. Collazuol, G.A. de Nolfo, K. Ebisawa, A.W. Ficklin, H. Fuke, S. Gonzi, T.G. Guzik, T. Hams, K. Hibino, M. Ichimura, W. Ishizaki, M.H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H.S. Krawczynski, J.F. Krizmanic, P. Maestro, P.S. Marrocchesi, A.M. Messineo, J.W. Mitchell, S. Miyake, A.A. Moiseev, M. Mori, N. Mori, H.M. Motz, K. Munakata, S. Nakahira, J. Nishimura, M. Negro, S. Okuno, J.F. Ormes, S. Ozawa, L. Pacini, P. Papini, B.F. Rauch, S.B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J.P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W.V. Zober

    Advances in Space Research    2024.04

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  • Direct measurements of cosmic – Ray iron and nickel with CALET on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W.R. Binns, M. Bongi, P. Brogi, A. Bruno, N. Cannady, G. Castellini, C. Checchia, M.L. Cherry, G. Collazuol, G.A. de Nolfo, K. Ebisawa, A.W. Ficklin, H. Fuke, S. Gonzi, T.G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M.H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H.S. Krawczynski, J.F. Krizmanic, P. Maestro, P.S. Marrocchesi, M. Mattiazzi, A.M. Messineo, J.W. Mitchell, S. Miyake, A.A. Moiseev, M. Mori, N. Mori, H.M. Motz, K. Munakata, S. Nakahira, J. Nishimura, S. Okuno, J.F. Ormes, S. Ozawa, L. Pacini, P. Papini, B.F. Rauch, S.B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J.P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W.V. Zober

    Advances in Space Research    2024.03

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  • From SuperTIGER to TIGERISS

    B. F. Rauch, W. V. Zober, Q. Abarr, Y. Akaike, W. R. Binns, R. F. Borda, R. G. Bose, T. J. Brandt, D. L. Braun, J. H. Buckley, N. W. Cannady, S. Coutu, R. M. Crabill, P. F. Dowkontt, M. H. Israel, M. Kandula, J. F. Krizmanic, A. W. Labrador, W. Labrador, L. Lisalda, J. V. Martins, M. P. McPherson, R. A. Mewaldt, J. G. Mitchell, J. W. Mitchell, S. A. I. Mognet, R. P. Murphy, G. A. de Nolfo, S. Nutter, M. A. Olevitch, N. E. Osborn, I. M. Pastrana, K. Sakai, M. Sasaki, S. Smith, H. A. Tolentino, N. E. Walsh, J. E. Ward, D. Washington, A. T. West, L. P. Williams

    Instruments    2024.01

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  • Erratum: Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station [Phys. Rev. Lett. 130, 211001 (2023)

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, G. A. de Nolfo, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Physical review letters   131 ( 10 ) 109902  2023.09

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    This corrects the article DOI: 10.1103/PhysRevLett.130.211001.

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  • The cosmic-ray electron and positron spectrum measured with CALET on the International Space Station

    Yosui Akaike, Oscar Adriani, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.08

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  • Results from CALorimetric Electron Telescope (CALET) Observations of Gamma-rays on the International Space Station

    Masaki Mori, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.08

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  • Optimization of the proton background rejection in the measurement of the electron flux at high energies with CALET on the International Space Station

    Sandro Gonzi, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.08

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  • Results of the Ultra-Heavy Cosmic-Ray Analysis with CALET on the International Space Station

    Wolfgang V Zober, Brian Flint Rauch, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.08

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  • Feasibility study on an analysis of CR helium flux with the CALET detector based on an extended acceptance

    Marco Mattiazzi, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.08

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  • Dark Matter Limits from the CALET Electron+Positron Spectrum with Individual Astrophysical Source Background

    Holger Motz, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.08

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  • Interpretation of the CALET Electron+Positron Spectrum by Astrophysical Sources

    Holger Motz, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.08

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  • Cosmic-Ray Modulation during Solar Cycles 24-25 Transition Observed with CALET on the International Space Station

    Shoko Miyake, Oscar Adriani, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober, Kazuoki Munakata, Yosui Akaike

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.08

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  • Observation of spectral structures in the flux of cosmic ray protons with CALET on the International Space Station

    Kazuyoshi Kobayashi, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.08

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  • CALET Search for electromagnetic counterparts of gravitational waves in O4

    Yuta Kawakubo, Michael L. Cherry, Takanori Sakamoto, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.08

    DOI

  • Flux ratios of primary elements measured by CALET on the International Space Station

    Caterina Checchia, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.08

    DOI

  • Iron and Nickel fluxes measured by CALET on the International Space Station

    Francesco Stolzi, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.08

    DOI

  • Refinement of the High-Energy Gamma-ray Selection for CALET on the International Space Station

    Nicholas W Cannady, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.07

    DOI

  • Statistical analysis into the drivers behind relativistic electron precipitation events observed by CALET on the International Space Station

    Anthony Ficklin, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.07

    DOI

  • Status of the operations of CALET for 7.5 years on the International Space Station

    Tadahisa Tamura, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.07

    DOI

  • Observational Challenges on the ISS: A Case Study with CALET

    Nicholas W Cannady, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.07

    DOI

  • Event-by-Event Analysis for TeV Electron Candidates with CALET on the International Space Station

    Nicholas W Cannady, Yosui Akaike, Shoji Torii, Oscar Adriani, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.07

    DOI

  • Boron flux in cosmic rays and its flux ratio to primary species measured with CALET on the International Space Station

    Paolo Maestro, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.07

    DOI

  • Measurement of iron cosmic-ray primaries below 10 GeV/n by use of the geomagnetic effect with CALET

    Masakatsu Ichimura, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Paolo Brogi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.07

    DOI

  • Helium flux and its ratio to proton flux in cosmic rays measured with CALET on the International Space Station

    Paolo Brogi, Oscar Adriani, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, Massimo Bongi, Alessandro Bruno, Nicholas Wade Cannady, Guide Castellini, Caterina Checchia, Walter Robert Cherry, Gianmaria Collazuol, Georgia A. de Nolfo, Ken Ebisawa, Anthony W. Ficklin, Hideyuki Fuke, Sandro Gonzi, T. Gregory Guzik, Thomas Hams, Kinya Hibino, Masakatsu Ichimura, Kunihito Ioka, Wataru Ishizaki, Martin H. Israel, Katsumasa Kasahara, Jun Kataoka, Ryuho Kataoka, Yusaku Katayose, Chihiro Kato, Norita Kawanaka, Yuta Kawakubo, Kenko Kobayashi, Kazunori Kohri, Henric S. Krawczynski, John F. Krizmanic, Paolo Maestro, Pier Simone Marrocchesi, Alberto Maria Messineo, Jason W. Mitchell, Shoko Miyake, Alexander Moiseev, Masaki Mori, Nicola Mori, Holger Martin Motz, Kazuoki Munakata, Satoshi Nakahira, Jun Nishimura, Shoji Okuno, Jonathan Ormes, Shunsuke OZAWA, Lorenzo Pacini, Paolo Pacini, Brian Flint Rauch, Ricciarini Ricciarini, Kazuhiro Sakai, Takanori Sakamoto, Makoto Sasaki, Yuki Shimizu, Atsushi Shiomi, Piero Spillantini, Francesco Stolzi, Satoshi Sugita, Arta Sulaj, Masato Takita, Tadahisa Tamura, Toshio Terasawa, Shoji Torii, Yoshiki Tsunesada, Yukio Uchihori, Elena Vannuccini, John P. Wefel, Kazutaka Yamaoka, Shohei Yanagita, Atsumasa Yoshida, Kenji Yoshida, Wolfgang V Zober

    Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)    2023.07

    DOI

  • CALET on the International Space Station: a precise measurement of the iron spectrum

    O. Adriani, Yosui Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W. R. Binns, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, Caterina Checchia, M. L. Cherry, G. Collazuol, K. Ebisawa, A. W. Ficklin, H. Fuke, S. Gonzi, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. de Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, Francesco Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W. V. Zober

    Proceedings of Science   398  2022.05

    　View Summary

    The Calorimetric Electron Telescope (CALET) was launched on the International Space Station in 2015 and since then has collected a large sample of cosmic-ray charged particles over a wide energy. Thanks to a couple of layers of segmented plastic scintillators placed on top of the detector, the instrument is able to identify the charge of individual elements from proton to iron (and above). The imaging tungsten scintillating fiber calorimeter provides accurate particle tracking and the lead tungstate homogeneous calorimeter can measured the energy with a wide dynamic range. One of the CALET scientific objectives is to measure the energy spectra of cosmic rays to shed light on their acceleration and propagation in the Galaxy. By the observation in first five years, a precise measurement of the iron spectrum is now available in the range of kinetic energy per nucleon from 10 GeV/n to 2 TeV/n. The CALET's result with a description of the analysis and details on systematic uncertainties will be illustrated. Also, a comparison with previous experiments' results is given.

  • Investigating the Vela SNR's Emission of Electron Cosmic Rays with CALET at the International Space Station

    H. Motz, O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, E. Berti, G. Bigongiari, W.R. Binns, M. Bongi, P. Brogi, A. Bruno, J.H. Buckley, N. Cannady, G. Castellini, C. Checchia, M.L. Cherry, G. Collazuol, K. Ebisawa, A.W. Ficklin, H. Fuke, S. Gonzi, T.G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M.H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kobayashi, K. Kohri, H. Krawczynski, J.F. Krizmanic, J. Link, P. Maestro, P.S. Marrocchesi, A.M. Messineo, J.W. Mitchell, S. Miyake, A.A. Moiseev, M. Mori, N. Mori, K. Munakata, S. Nakahira, J. Nishimura, G.A. de Nolfo, S. Okuno, J.F. Ormes, N. Ospina, S. Ozawa, L. Pacini, P. Papini, B.F. Rauch, S.B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, P. Spillantini, F. Stolzi, S. Sugita, A. Sulaj, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J.P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, W.V. Zober

    Proceedings of Science, 37th International Cosmic Ray Conference   Volume 395 ( 100 )  2022.03

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  • Monte Carlo Study of Electron and Positron Cosmic-Ray Propagation with the CALET Spectrum

    Katsuaki Asano, Yoichi Asaoka, Yosui Akaike, Norita Kawanaka, Kazunori Kohri, Holger M. Motz, Toshio Terasawa

    ASTROPHYSICAL JOURNAL   926 ( 1 ) 5 - 5  2022.02  [Refereed]

    　View Summary

    <title>Abstract</title>
    Focusing on the electron and positron spectrum measured with the Calorimetric Electron Telescope (CALET), which shows characteristic structures, we calculate the flux contributions of cosmic rays that have escaped from randomly appearing supernova remnants. We adopt a Monte Carlo method to take into account the stochastic nature of the appearance of nearby sources. We find that without a complicated energy dependence of the diffusion coefficient, simple power-law diffusion coefficients can produce spectra similar to the CALET spectrum, even with a dispersion in the injection index. The positron component measured with AMS-02 is consistent with a bump-like structure around 300 GeV in the CALET spectrum. One to three nearby supernovae can contribute up to a few tens of percent of the CALET flux at 2–4 TeV, while ten or more unknown and distant (≳500 pc) supernovae account for the remaining several tens of percent of the flux. The CALET spectrum, showing a sharp drop at ∼1 TeV, allows for a contribution of cosmic rays from an extraordinary event that occurred ∼400 kyr ago. This type of event releases electrons/positrons with a total energy more than 10 times the average energy for usual supernovae, and its occurrence rate is lower than one three-hundredth of the usual supernova rate.

    DOI

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  • CALET Observations during the First 5 Years on the ISS

    P. S. Marrocchesi, O. Adriani, Y. Akaike, Y. Asaoka, E. Berti, G. Bigongiari, M. Bongi, P. Brogi, A. Bruno, N. Cannady, C. Checchia, M. L. Cherry, G. Collazuol, A. W. Ficklin, T. G. Guzik, M. Ichimura, M. H. Israel, K. Kasahara, Y. Kawakubo, J. F. Krizmanic, A. M. Messineo, J. W. Mitchell, S. Miyake, M. Mori, N. Mori, H. M. Motz, K. Munakata, L. Pacini, F. Palma, P. Papini, B. F. Rauch, S. B. Ricciarini, T. Sakamoto, M. Sasaki, F. Stolzi, A. Sulaj, T. Tamura, S. Torii, J. P. Wefel, K. Yoshida, W. V. Zober

    Physics of Atomic Nuclei   84 ( 6 ) 985 - 994  2021.11

    　View Summary

    The CALorimetric Electron Telescope CALET is collecting science data on the International Space Station since October 2015 with excellent and continuous performance. Energy is measured with a deep homogeneous calorimeter (1.2 nuclear interaction lengths, 27 radiation lengths) preceded by an imaging pre-shower (3 radiation lengths, 1mm granularity) providing tracking and 10-5 electron/proton discrimination. Two independent sub-systems identify the charge Z of the incident particle from proton to iron and above (Z<40). CALET measures the cosmic-ray electron + positron flux up to 20 TeV, gamma rays up to 10 TeV, and nuclei up to the PeV scale. In this paper, we report the on-orbit performance of the instrument and summarize the main results obtained during the first 5 years of operation, including the electron + positron energy spectrum and the individual spectra of protons, heavier nuclei and iron. Solar modulation and gamma-ray observations are also concisely reported, as well as transient phenomena and the search for gravitational wave counterparts.

    DOI

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    3
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  • CALET on the International Space Station: The first three years of observations

    P. Brogi, P. Brogi, O. Adriani, O. Adriani, Y. Akaike, Y. Akaike, K. Asano, Y. Asaoka, Y. Asaoka, M. G. Bagliesi, M. G. Bagliesi, E. Berti, E. Berti, G. Bigongiari, G. Bigongiari, W. R. Binns, S. Bonechi, S. Bonechi, M. Bongi, M. Bongi, A. Bruno, J. H. Buckley, N. Cannady, N. Cannady, G. Castellini, C. Checchia, C. Checchia, M. L. Cherry, G. Collazuol, G. Collazuol, V. Di Felice, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, N. Kawanaka, Y. Kawakubo, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, J. F. Krizmanic, J. Link, J. Link, P. Maestro, P. Maestro, P. S. Marrocchesi, P. S. Marrocchesi, A. M. Messineo, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, N. Ospina, S. Ozawa, L. Pacini, F. Palma, F. Palma, P. Papini, B. F. Rauch, S. B. Ricciarini, S. B. Ricciarini, K. Sakai, K. Sakai, T. Sakamoto, M. Sasaki, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, F. Stolzi, S. Sugita, J. E. Suh, J. E. Suh, A. Sulaj

    Physica Scripta   95 ( 7 )  2020.07

    　View Summary

    The CALorimetric Electron Telescope CALET is a space instrument designed to carry out precision measurements of high energy cosmic-rays on the JEM-EF external platform on the International Space Station, where it has been collecting science data continuously since mid October 2015. In addition to its primary goal of identifying nearby sources of high-energy electrons and possible signatures of dark matter in the electron spectrum, CALET is carrying out extensive measurements of the energy spectra, relative abundances and secondary-to-primary ratios of elements from proton to iron, and even above (up to Z = 40), studying the details of galactic particle propagation and acceleration. An overview of CALET based on the data taken during the first three years of observations is presented, including a direct measurement of the electron+positron energy spectrum from 11 GeV to 4.8 TeV. The proton spectrum has been measured from 50 GeV to 10 TeV covering, for the first time with a single space-borne instrument, the whole energy interval previously investigated in separate sub-ranges by magnetic spectrometers and calorimetric instruments. Preliminary spectra of cosmic-ray nuclei are also presented, together with gamma-ray observations and searches for an e.m. counterpart of LIGO/Virgo GW events.

    DOI

    Scopus

    5
    Citation
    (Scopus)

  • CALET results after three years on the International Space Station

    Y. Asaoka, O. Adriani, Y. Akaike, K. Asano, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, J. Link, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, M. Mori, N. Mori, H. M. Motz, K. Munakata, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, N. Opsina, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, V. Pal'Shin, P. Papini, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, S. Sugita, J. E. Suh, A. Sulaj, I. Takahashi, M. Takita, T. Tamura, T. Terasawa, S. Torii, Y. Tsunesada, Y. Uchihori, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Journal of Physics: Conference Series   1468 ( 1 )  2020.03

    　View Summary

    The CALET (CALorimetric Electron Telescope) space experiment, which is currently conducting direct cosmic-ray observations onboard the International Space Station (ISS), is an all-calorimetric instrument optimized for cosmic-ray electron measurements with capability to measure hadrons and gamma-rays. Since the start of observation in October 2015, smooth and continuous operations have taken place. In this paper, we will give a brief summary of the CALET observations ranging from charged cosmic rays, gamma-rays, to space weather, while focusing on the energy spectra of electrons and protons.

    DOI

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    2
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    (Scopus)

  • CALET Results after Three Years on Orbit on the International Space Station

    P. Maestro, O. Adriani, Y. Akaike, Y. Asaoka, E. Berti, G. Bigongiari, M. Bongi, P. Brogi, A. Bruno, N. Cannady, C. Checchia, M. L. Cherry, G. Collazuol, T. G. Guzik, M. Ichimura, M. H. Israel, K. Kasahara, Y. Kawakubo, J. F. Krizmanic, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, M. Mori, N. Mori, H. M. Motz, K. Munakata, L. Pacini, F. Palma, P. Papini, B. F. Rauch, S. B. Ricciarini, T. Sakamoto, M. Sasaki, F. Stolzi, A. Sulaj, T. Tamura, S. Torii, J. P. Wefel, K. Yoshida

    Physics of Atomic Nuclei   82 ( 6 ) 766 - 772  2019.11

    DOI

  • The CALorimetric Electron Telescope (CALET) on the international space station: Results from the first two years on orbit

    Y. Asaoka, O. Adriani, Y. Akaike, K. Asano, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, A. Bruno, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, K. Kohri, H. S. Krawczynski, J. F. Krizmanic, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, S. Nakahira, J. Nishimura, G. A. De Nolfo, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, V. Pal'Shin, P. Papini, A. V. Penacchioni, B. F. Rauch, S. B. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, S. Sugita, J. E. Suh, A. Sulaj, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida

    Journal of Physics: Conference Series   1181 ( 1 )  2019.03  [Refereed]

    　View Summary

    © Published under licence by IOP Publishing Ltd. The CALorimetric Electron Telescope (CALET) is a high-energy astroparticle physics space experiment installed on the International Space Station (ISS), developed and operated by Japan in collaboration with Italy and the United States. The CALET mission goals include the investigation of possible nearby sources of high-energy electrons, of the details of galactic particle acceleration and propagation, and of potential signatures of dark matter. CALET measures the cosmic-ray electron+positron flux up to 20 TeV, gamma-rays up to 10 TeV, and nuclei with Z=1 to 40 up to 1, 000 TeV for the more abundant elements during a long-term observation aboard the ISS. Starting science operation in mid-October 2015, CALET performed continuous observation without major interruption with close to 20 million triggered events over 10 GeV per month. Based on the data taken during the first two-years, we present an overview of CALET observations: 1) Electron+positron energy spectrum, 2) Nuclei analysis, 3) Gamma-ray observation including a characterization of on-orbit performance. Results of the electromagnetic counterpart search for LIGO/Virgo gravitational wave events are discussed as well.

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    22
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  • Solar modulation of galactic cosmic-ray electrons measured with CALET

    Shoko Miyake, Yotaro Migita, Yoichi Asaoka, Yosui Akaike, Shoji Torii, Toshio Terasawa, Ryuho Kataoka, Kenichi Sakai

    Proceedings of Science   358  2019

    　View Summary

    The CALorimetric Electron Telescope (CALET) installed on the International Space Station has multiple event trigger modes for measuring high-energy particles and gamma rays. The observations of the low-energy cosmic-ray (CR) electrons (electrons + positrons) in an energy region from 1 GeV to 10 GeV have been successfully performed by a low-energy shower trigger mode working in the geomagnetic polar regions. The continuous measurements of the low-energy CR electrons may provide a crucial key to the understanding of the solar modulation of the galactic cosmic rays. Here we have analyzed the low-energy CR electrons measured by CALET over the past three years to investigate the solar modulation of the CR electrons. We have obtained the continuous variation of the low-energy electron flux increasing as time passes, which have been expected from a recent weakening solar cycle. We have also confirmed that there are additional small fluctuations in the flux, that has a potential to be explained by the effects of the interplanetary coronal mass ejections or the co-rotating interaction region of the solar wind.

  • Energy calibration of CALET onboard the International Space Station

    Y. Asaoka, Y. Akaike, Y. Komiya, R. Miyata, S. Torii, O. Adriani, K. Asano, M. G. Bagliesi, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, A. Javaid, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, H. Kitamura, H. S. Krawczynski, J. F. Krizmanic, S. Kuramata, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, K. Mizutani, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, Y. E. Nakagawa, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    Astroparticle Physics   91   1 - 10  2017.05

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  • CALET UPPER LIMITS on X-RAY and GAMMA-RAY COUNTERPARTS of GW151226

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, A. Javaid, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, C. Kato, N. Kawanaka, Y. Kawakubo, H. Kitamura, H. S. Krawczynski, J. F. Krizmanic, S. Kuramata, T. Lomtadze, P. Maestro, P. S. Marrocchesi, A. M. Messineo, J. W. Mitchell, S. Miyake, K. Mizutani, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, Y. E. Nakagawa, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, L. Pacini, F. Palma, P. Papini, A. V. Penacchioni, B. F. Rauch, S. Ricciarini, K. Sakai, T. Sakamoto, M. Sasaki, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, F. Stolzi, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tsunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    Astrophysical Journal Letters   829 ( 1 )  2016.09

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    39
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  • 19aAZ-3 Operation of CALET ground monitoring data system

    Yamaguchi Masayuki, Torii Shoji, Asaoka Yoichi, Kasahara Katsuaki, Akaike Yosui, Ozawa Shunsuke, Kamio Taiju, Satoh Fumiya, Takemoto Shoichi, Miyata Ryohei, the CALET collaboration

    Meeting Abstracts of the Physical Society of Japan   71   458 - 458  2016

    DOI CiNii

  • 19aAZ-2 Optimization of Electron Observation Condition for CALET onboard ISS

    Asaoka Yoichi, Torii Shoji, Kasahara Katsuaki, Akaike Yosui, Ozawa Shunsuke, Ando Yuki, Kamio Taiju, Satoh Fumiya, Takemoto Shoichi, Tanaka Mizuki, Miyata Ryohei, Yamaguchi Masayuki, Yamato Keiichi, Motz Holger, Shimizu Yuki, Tamura Tadahisa, Ueno Shiro, Tomida Hiroshi, the CALET collaboration

    Meeting Abstracts of the Physical Society of Japan   71   457 - 457  2016

    DOI CiNii

  • 19aAZ-5 Real time event-selection algorithm for the CALET on-orbit observation

    Takemoto Shoichi, Torii Shoji, Asaoka Yoichi, Kasahara Katsuaki, Akaike Yosui, Ozawa Shunsuke, Kamio Taiju, Tanaka Mizuki, Miyata Ryohei, Yamaguchi Masayuki, the CALET collaboration

    Meeting Abstracts of the Physical Society of Japan   71   460 - 460  2016

    DOI CiNii

  • 19aAZ-4 MIP Calibration of CALET Using On-Orbit Data

    Komiya Yuma, Torii Shoji, Kasahara Katsuaki, Akaike Yosui, Asaoka Yoichi, Ozawa Shunsuke, Motz Holger, Shimizu Yuki, Tamura Tadahisa, CALET collaborating teams

    Meeting Abstracts of the Physical Society of Japan   71   459 - 459  2016

    DOI CiNii

  • 19aAZ-7 Method of determining the arrival direction of cosmic rays in CALET observation

    Satoh Fumiya, Torii Shoji, Asaoka Yoichi, Kasahara Katsuaki, Akaik Yosui, Ozawa Shunsuke, Takemoto Shoichi, Nakahira Satoshi, the CALET collaboration

    Meeting Abstracts of the Physical Society of Japan   71   461 - 461  2016

    DOI CiNii

  • The CALorimetric Electron Telescope (CALET) for high-energy astroparticle physics on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, J. H. Buckley, G. Castellini, M. L. Cherry, G. Collazuol, K. Ebisawa, V. Di Felice, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, M. H. Israel, A. Javaid, E. Kamioka, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, N. Kawanaka, H. Kitamura, T. Kotani, H. S. Krawczynski, J. F. Krizmanic, A. Kubota, S. Kuramata, T. Lomtadze, P. Maestro, L. Marcelli, P. S. Marrocchesi, J. W. Mitchell, S. Miyake, K. Mizutani, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, Y. E. Nakagawa, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, F. Palma, P. Papini, B. F. Rauch, S. B. Ricciarini, T. Sakamoto, M. Sasaki, M. Shibata, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    Journal of Physics: Conference Series   632 ( 1 )  2015.08

    　View Summary

    The CALorimetric Electron Telescope (CALET) is a space experiment, currently under development by Japan in collaboration with Italy and the United States, which will measure the flux of cosmic-ray electrons (and positrons) up to 20 TeV energy, of gamma rays up to 10 TeV, of nuclei with Z from 1 to 40 up to 1 PeV energy, and will detect gamma-ray bursts in the 7 keV to 20 MeV energy range during a 5 year mission. These measurements are essential to investigate possible nearby astrophysical sources of high energy electrons, study the details of galactic particle propagation and search for dark matter signatures. The main detector of CALET, the Calorimeter, consists of a module to identify the particle charge, followed by a thin imaging calorimeter (3 radiation lengths) with tungsten plates interleaving scintillating fibre planes, and a thick energy measuring calorimeter (27 radiation lengths) composed of lead tungstate logs. The Calorimeter has the depth, imaging capabilities and energy resolution necessary for excellent separation between hadrons, electrons and gamma rays. The instrument is currently being prepared for launch (expected in 2015) to the International Space Station ISS, for installation on the Japanese Experiment Module - Exposure Facility (JEM-EF).

    DOI

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    12
    Citation
    (Scopus)

  • The CALorimetric Electron Telescope (CALET) for high-energy astroparticle physics on the International Space Station

    O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, J. H. Buckley, G. Castellini, M. L. Cherry, G. Collazuol, K. Ebisawa, V. Di Felice, H. Fuke, T. G. Guzik, T. Hams, M. Hareyama, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, M. H. Israel, A. Javaid, E. Kamioka, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose, N. Kawanaka, H. Kitamura, T. Kotani, H. S. Krawczynski, J. F. Krizmanic, A. Kubota, S. Kuramata, T. Lomtadze, P. Maestro, L. Marcelli, P. S. Marrocchesi, J. W. Mitchell, S. Miyake, K. Mizutani, A. A. Moiseev, K. Mori, M. Mori, N. Mori, H. M. Motz, K. Munakata, H. Murakami, Y. E. Nakagawa, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, F. Palma, P. Papini, B. F. Rauch, S. B. Ricciarini, T. Sakamoto, M. Sasaki, M. Shibata, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    EPJ Web of Conferences   95  2015.05

    　View Summary

    The CALorimetric Electron Telescope (CALET) is a space experiment, currently under development by Japan in collaboration with Italy and the United States, which will measure the flux of cosmic-ray electrons (and positrons) up to 20 TeV energy, of gamma rays up to 10 TeV, of nuclei with Z from 1 to 40 up to 1 PeV energy, and will detect gamma-ray bursts in the 7 keV to 20 MeV energy range during a 5 year mission. These measurements are essential to investigate possible nearby astrophysical sources of high energy electrons, study the details of galactic particle propagation and search for dark matter signatures. The main detector of CALET, the Calorimeter, consists of a module to identify the particle charge, followed by a thin imaging calorimeter (3 radiation lengths) with tungsten plates interleaving scintillating fibre planes, and a thick energy measuring calorimeter (27 radiation lengths) composed of lead tungstate logs. The Calorimeter has the depth, imaging capabilities and energy resolution necessary for excellent separation between hadrons, electrons and gamma rays. The instrument is currently being prepared for launch (expected in 2015) to the International Space Station ISS, for installation on the Japanese Experiment Module - Exposure Facility (JEM-EF).

    DOI

    Scopus

    1
    Citation
    (Scopus)

  • 26pSJ-3 Optimization of the CALET observation condition based on simulated events

    Yamato Keiichi, Torii Shoji, Asaoka Yoichi, Kasahara Katsuaki, Akaike Yosui, Ozawa Shunsuke, Kamio Taiju, Takemoto Shoichi, Yamaguchi Masayuki, Motz Holger, Shimizu Yuki, Tamura Tadahisa, Ueno Shiro, Tomida Hiroshi, CALET collaboration

    Meeting Abstracts of the Physical Society of Japan   70   366 - 366  2015

    DOI CiNii

  • 26pSJ-8 Performance of the CALET-CHD charge resolution evaluated by CERN-SPS heavy ion beam tests

    Okada Yuko, Torii Shoji, Asaoka Yoichi, Kasahara Katsuaki, Ozawa Shunsuke, Akaike Yosui, Tanaka Masafumi, Tsuchikawa Eriko, Motz Holger, Tamura Tadahisa, CALET collaboration

    Meeting Abstracts of the Physical Society of Japan   70   367 - 367  2015

    DOI CiNii

  • 21pDC-5 Development of data control system for CALET on-orbit operation

    Kamio Taiju, Torii Shoji, Ozawa Shunsuke, Shimomura Kenta, Niita Tae, Rikiishi Kazuki, Asaoka Yoichi, Kasahara Katsuaki, Motz Holger, Tamura Tadahisa, Shimizu Yuki, Akaike Yosui

    Meeting Abstracts of the Physical Society of Japan   70   400 - 400  2015

    DOI CiNii

  • 26pSJ-2 Mission Operations at Waseda CALET Operations Center (WCOC)

    Asaoka Yoichi, Torii Shoji, Akaike Yosui, Ozawa Shunsuke, Kasahara Katsuaki, Kamio Taiju, Niita Tae, Motz Holger, Shimizu Yuki, Tamura Tadahisa, Ueno Shiro, Tomida Hiroshi, CALET collaboration

    Meeting Abstracts of the Physical Society of Japan   70   365 - 365  2015

    DOI CiNii

  • 21pDC-9 Expected Dark Matter Sensitivity of CALET in Relation to Present and Future AMS-02 Observation

    Motz Holger, Asaoka Yoichi, Torii Shoji, Bhattacharyya Saptashwa, Niita Tae, Okada Yuko, Akaike Yosui, CALET collaboration

    Meeting Abstracts of the Physical Society of Japan   70   402 - 402  2015

    DOI CiNii

  • 21pDC-8 CALET's performance for observation of heavy nuclei energy-spectra

    Sato Fumika, Torii Shoji, Saito Yu, Niita Tae, Asaoka Yoichi, Kasahara Katsuaki, Ozawa Shunsuke, Akaike Yosui, CALET Collaboration

    Meeting Abstracts of the Physical Society of Japan   70   401 - 401  2015

    DOI CiNii

  • Status and performance of the CALorimetric Electron Telescope (CALET) on the international space station

    O. Adriani, Y. Akaike, Y. Asaoka, K. Asano, M. G. Bagliesi, G. Bigongiari, W. R. Binns, M. Bongi, J. H. Buckley, A. Cassese, G. Castellini, M. L. Cherry, G. Collazuol, K. Ebisawa, V. di Felice, H. Fuke, T. G. Guzik, T. Hamsa, N. Hasebe, M. Hareyama, K. Hibino, M. Ichimura, K. Ioka, M. H. Israel, A. Javaid, E. Kamioka, K. Kasahara, Y. Katayose, J. Kataoka, R. Kataoka, N. Kawanaka, H. Kitamura, T. Kotani, H. S. Krawczynski, J. F. Krizmanic, A. Kubota, S. Kuramata, T. Lomtadze, P. Maestro, L. Marcelli, P. S. Marrocchesi, J. W. Mitchell, S. Miyake, K. Mizutani, H. M. Motz, A. A. Moiseev, K. Mori, M. Mori, N. Mori, K. Munakata, H. Murakami, Y. E. Nakagawa, S. Nakahira, J. Nishimura, S. Okuno, J. F. Ormes, S. Ozawa, F. Palma, P. Papini, B. F. Rauch, S. Ricciarini, T. Sakamoto, M. Sasaki, M. Shibata, Y. Shimizu, A. Shiomi, R. Sparvoli, P. Spillantini, I. Takahashi, M. Takayanagi, M. Takita, T. Tamura, N. Tateyama, T. Terasawa, H. Tomida, S. Torii, Y. Tunesada, Y. Uchihori, S. Ueno, E. Vannuccini, J. P. Wefel, K. Yamaoka, S. Yanagita, A. Yoshida, K. Yoshida, T. Yuda

    Nuclear Physics B - Proceedings Supplements   256-257   225 - 232  2014.12

    　View Summary

    © 2014 Elsevier B.V. The CALorimetric Electron Telescope (CALET) space experiment, currently under development by Japan in collaboration with Italy and the United States, will measure the flux of cosmic-ray electrons (including positrons) to 20 TeV, gamma rays to 10 TeV and nuclei with Z=1 to 40 up to 1,000 TeV during a two-year mission on the International Space Station (ISS), extendable to five years. These measurements are essential to search for dark matter signatures, investigate the mechanism of cosmic-ray acceleration and propagation in the Galaxy and discover possible astrophysical sources of high-energy electrons nearby the Earth. The instrument consists of two layers of segmented plastic scintillators for the cosmic-ray charge identification (CHD), a 3 radiation length thick tungsten-scintillating fiber imaging calorimeter (IMC) and a 27 radiation length thick lead-tungstate calorimeter (TASC). CALET has sufficient depth, imaging capabilities and excellent energy resolution to allow for a clear separation between hadrons and electrons and between charged particles and gamma rays. The instrument will be launched to the ISS within 2014 Japanese Fiscal Year (by the end of March 2015) and installed on the Japanese Experiment Module-Exposed Facility (JEM-EF). In this paper, we will review the status and main science goals of the mission and describe the instrument configuration and performance.

    DOI

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  • Data Analysis and Handling for CALET

    AKAIKE Yosui, ASAOKA Yoichi, UENO Shiro, TAMURA Tadahisa, TERASAWA Toshio, TOMIDA Hiroshi, TORII Shoji, NAKAGAWA.E Yujin, NIITA Tae

    JAXA research and development report   13   99 - 107  2014.03

    　View Summary

    CALorimetric Electron Telescope (CALET) is a new observatory to be placed on the International Space Station in 2014 to carry out the accurate measurements of electrons in 1 GeV . 20 TeV, gamma-rays in 10 GeV . 10 TeV and protons and nuclei in several 10 GeV . 1000 TeV. The scienti.c objectives of the mission are mainly to search for nearby cosmic ray sources and dark matter signatures. CALET, with its imaging and deep calorimeter, provides excellent energy resolution and high background rejection, which are con.rmed by Monte Carlo simulations and accelerator beam experiments. In this paper, we present the data analysis methods based on simulations and experiments with the ground system for CALET operation and data handling.

    CiNii

  • 28aTS-4 CALET Ground Operations System : Role and Status of WCOC

    ASAOKA Yoichi, TORII Shoji, OZAWA Shunsuke, KASAHARA Katsuaki, KAMIO Taiju, SHIMOMURA Kenta, NIITA Tae, MOTZ Holger, RIKIISHI Kazuki, TAMURA Tadahisa, UENO Shiro, SHIMIZU Yuki, TOMIDA Hiroshi, AKAIKE Yosui, the CALET Team

    Meeting Abstracts of the Physical Society of Japan   69.1.1   123  2014

    DOI CiNii

  • 19aSC-5 Development of CALET Data Processing System at Waseda CALET Operations Center(WCOC)

    Asaoka Yoichi, Torii Shoji, Ozawa Shunsuke, Kasahara Katsuaki, Kamio Taiju, Niita Tae, Motz Holger, Rikiishi Kazuki, Tamura Tadahisa, Ueno Shiro, Shimizu Yuki, Tomida Hiroshi, Akaike Yosui, CALET collaboration

    Meeting Abstracts of the Physical Society of Japan   69.2.1   38  2014

    DOI CiNii

  • 28aTS-5 CALET Telemetory Data Simulation on ISS Orbit

    SHIMOMURA Kenta, TORII Shoji, ASAOKA Yoichi, OZAWA Shunsuke, KASAHARA Katsuaki, KAMIO Yasuki, NIITA Tae, MOTZ Holger, RIKIISHI Kazuki, TAMURA Tadahisa, UENO Shiro, SHIMIZU Yuki, TOMIDA Hiroshi, AKAIKE Yosui, the CALET Team

    Meeting Abstracts of the Physical Society of Japan   69.1.1   123  2014

    DOI CiNii

  • 19aSC-6 Evaluation of the CALET on-orbit data by simulation of observed data

    Rikiishi Kazuki, Torii Shoji, Kamio Taiju, Shimomura Kenta, Niita Tae, Asaoka Yoichi, Kasahara Katsuaki, Ozawa Shunsuke, Motz Holger, Tamura Tadahisa, Shimizu Yuki, Akaike Yosui, CALET collaboration

    Meeting Abstracts of the Physical Society of Japan   69.2.1   38  2014

    DOI CiNii

  • 19aSC-7 Development of operation system for the CALET on-orbit data at WCOC

    Shimomura Kenta, Torii Shoji, Kamio Taiju, Niita Tae, Rikiishi Kazuki, Asaoka Yoichi, Kasahara Katsuaki, Ozawa Shunsuke, Motz Holger, Tamura Tadahisa, Shimizu Yuki, Akaike Yosui, CALET collaboration

    Meeting Abstracts of the Physical Society of Japan   69.2.1   38  2014

    DOI CiNii

  • The performance evaluation of CALET-CHD by CERN-SPS ion beam experiment

    OZAWA Shunsuke, AKAIKE Yosui, UEYAMA Yoshitaka, KASAHARA Katsuaki, KANEKO Shogo, SAITO Yu, TAMURA Tadahisa, TORII Shoji, MURATA Akira, NIITA Tae, CALETteam

    Meeting Abstracts of the Physical Society of Japan   68.2.1   115  2013

    DOI CiNii

  • The CALET structure and thermal model used for beam test at CERN

    Ueyama Yoshitaka, Torii Shoji, Kasahara Katsuaki, Ozawa Shunsuke, Niita Tae, Nakamura Masanori, Kaneko Shogo, Katahira Ryo, Murata Akira, Tamura Tadahisa, Katayose Yusaku, Akaike Yosui, Shimizu Yuki

    Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013   2013-October  2013

    　View Summary

    The Calorimetric Electron Telescope (CALET) is a new space experiment for astroparticle physics, which will carry out a five-year observation at the Japanese Experiment Module-Exposed Facility (JEM-EF) of the International Space Station (ISS). The experiment, currently under development by Japan in collaboration with Italy and the United States, will measure mainly the flux of cosmic-ray electrons (including positrons) to 20 TeV, gamma-rays to 10 TeV, and nuclei with Z=1 to 40 up to 1000 TeV. We have carried out a beam test of the CALET calorimeter at CERN-SPS by using the Beam-Test Model (BTM), which consisted of the Structure and Thermal Model (STM) and the Bread Board Model(BBM) of the front end circuits. The model consists of the same support structure as the CALET flight model and it includes the Imaging Calorimeter (IMC), the Total Absorption Calorimeter(TASC) and the Charge Detector(CHD). A part of the sensors; the scintillating fibers in the IMC, the PWO logs in the TASC, and the plastic scintillators paddles in the CHD, was adapted for the test. We will describe the model, and will report the basic performance obtained in the beam test.

  • Observation of electrons and gamma-rays with a balloon-borne CALET prototype (bCALET-2)

    NIITA Tae, TORII Shoji, OZAWA Shunsuke, KASAHARA Katsuaki, MURAKAMI Hiroyuki, AKAIKE Yosui, UEYAMA Yoshitaka, ITO Daijiro, KARUBE Mikihiko, KONDO Keinosuke, KYUTAN Marie, TAMURA Tadahisa, YOSHIDA Kenji, KATAYOSE Yusaku, SHIMIZU Yuki, FUKE Hideyuki

    JAXA research and development report   11   17 - 46  2012.03

    　View Summary

    We carried out the balloon experiments using CALET (CALorimetric Electron Telescope) proto-type detectors in May 2006 (bCALET-1) and August 2009 (bCALET-2) for verification of the detector performance and the capability of measuring cosmic rays at high altitude. The bCALET-2 instrument for observing the electrons and the gamma rays at energies in 1-100 GeV, is composed of an imaging calorimeter, consisting of 4096 scintillating fibers with a total of 3.6 radiation lengths of tungsten plates, and a total absorption calorimeter, consisting of crossed 60 BGO logs of 13.4 radiation lengths depth. The bCALET-2 was launched from the Taiki Aerospace Research Field, Japan Aerospace Exploration Agency, in Hokkaido, and flew successfully for 2.5 hours at a level altitude of 35 km. In this paper, we will present the spectra of electrons and gamma rays in the energy range of 1-100 GeV measured by bCALET-2, compared with our previous observations, bCALET-1 and BETS. The detector performance is studied by comparing with the simulations, and the cosmic ray fluxes, which are compatible with previous experiments, are successfully obtained.

    CiNii

  • Performance of the CALET prototype: CERN beam test

    Mikihiko Karube, Shoji Torii, Katsuaki Kasahara, Shunsuke Ozawa, Yosui Akaike, Toshihide Aiba, Yoshitaka Ueyama, Masanori Nakamura, Keisuke Yoshida, Tadahisa Tamura, Shoji Okuno, Yusaku Katayose, Yuki Shimizu

    Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011   6   383 - 386  2011

    　View Summary

    We are developing the CALET mission to observe high energy cosmic rays at the Japanese Experiment Module/Exposed Facility (JEM/EF) on the International Space Station. The instrument will be flown in 2013, and will be used for 5 years. The primary scientific purpose of CALET is to search for nearby cosmic ray sources and dark matter. We carried out an accelerator beam test with high energy particles with the CALET prototype at the CERN-SPS. The purpose of this test was to assess the detector performance as well as to study the accuracy of the Monte Carlo simulation method. The prototype detector consists of an imaging calorimeter with 256 scintillating fibers and a total absorption calorimeter consisting of 16 PWO logs. The longitudinal structure is similar with the CALET instrument. We used positron and proton beams in the energy region from 6 to 200 GeV, and from 30 to 150 GeV, respectively. Comparing the experimental data with the simulation results, we have measured the energy deposition in each component, the energy resolution, the lateral shower spread and the e/p separation capability.

    DOI

    Scopus

    2
    Citation
    (Scopus)

  • The CALET CHD for determination of nuclear charge

    Yuki Shimizu, Oscar Adriani, Yosui Akaike, Carlo Avanzini, Maria Grazia Bagliesi, Andrea Basti, Gabriele Bigongiari, Massimo Bongi, Guido Castellini, Daijiro Ito, Mikihiko Karube, Katsuaki Kasahara, Me Young Kim, Keinosuke Kondo, Temuriaz Lomtadze, Masanori Nakamura, Paolo Maestro, Pier Simone Marrocchesi, Fabio Morsani, Tae Niita, Sergio Bruno Ricciarini, Shoji Torii, Yoshitaka Ueyama

    Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011   6   391 - 394  2011  [Refereed]

    　View Summary

    Calorimetric Electron Telescope (CALET) will be a high energy cosmic ray observatory on the Japanese Experimental Module - Exposed Facility of the International Space Station. In addition to electrons and gamma-rays, CALET has an excellent detection capability of cosmic ray nuclei. In order to determine the atomic number of measured nuclei, the CHarge Detector (CHD) is placed on the top of the calorimeter. The CALET-CHD consists of two orthogonal layers of plastic scintillator charge-measuring modules. Each layer is segmented into 14 scintillator paddles (45 cm×3.2 cm×1 cm) for the reduction of back scattering effects. We evaluated the charge resolution of the plastic scintillators with heavy ion accelerators. In this presentation, we will report the design of the CALET-CHD and its nuclei identification capability as inferred from heavy ion beam tests.

    DOI

    Scopus

    1
    Citation
    (Scopus)

  • The event trigger system for CALET

    Yoshitaka Ueyama, Shoji Torii, Katsuaki Kasahara, Hiroyuki Murakami, Shunsuke Ozawa, Yosui Akaike, Tae Niita, Masanori Nakamura, Keisuke Yoshida, Tadahisa Tamura, Shoji Okuno, Yusaku Katayose, Yuki Shimizu

    Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011   6   387 - 390  2011  [Refereed]

    　View Summary

    The CALorimetric Electron Telescope, CALET, is a mission to study high energy phenomena in the universe by observing high energy cosmic rays (electrons, gamma rays, and nuclei) on the International Space Station. The instrument consists of a segmented plastic scintillator charge-measuring module, an imaging calorimeter consisting of 8 scintillating fiber planes interleaved with tungsten plates of 3 radiation length, and a total absorption calorimeter consisting of orthogonal PWO logs of 27 radiation length. It is necessary to eliminate the background events, mostly low energy protons that prevent efficient observation of high energy cosmic rays. Therefore, CALET has an on-board trigger system to select events which are 1) high energy showers, 2) low energy showers and 3) non-interacting protons or heavy nuclei. These triggers are generated by a combination of the signals from the charge detector, the imaging calorimeter, and the top layer of PWO in the total absorption calorimeter. A CERN-SPS beam test of the CALET prototype detector was carried out by using muons, electrons, and hadrons. We introduce the CALET trigger system and present its performance verified during the beam test.

    DOI

    Scopus

  • Measurements of cosmic-ray electron and gamma-ray flux with balloon-borne CALET prototype

    T. Niita, S. Torii, K. Kasahara, T. Tamura, K. Yoshida, Y. Katayose, H. Murakami, S. Ozawa, Y. Shimizu, Y. Akaike, Y. Ueyama, D. Ito, M. Karube, K. Kondo, M. Kyutan

    Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011   6   21 - 24  2011  [Refereed]

    　View Summary

    We carried out the balloon experiments using CALET (CALorimetric Electron Telescope) prototype detectors in May 2006 (bCALET-1) and August 2009 (bCALET-2) for verification of both the detector performance and the capability of measuring the cosmic rays at higher atmosphere. The bCALET-2 instrument for observing the electrons and the gamma rays at energies in 1-100 GeV is composed of an imaging calorimeter consisting of 4096 scintillating fibers with a total of 3.6 radiation lengths of tungsten plates, and a total absorption calorimeter consisting of crossed 60 BGO logs with a total of 13.4 radiation lengths depth. The bCALET-2 was launched from the Taiki Aerospace Research Field, Japan Aerospace Exploration Agency, in Hokkaido, and flew successfully for 2.5 hours at a level altitude of 35 km. In this paper, we will present the spectra of electrons and gamma rays in the energy range of 1-100 GeV measured by bCALET-2, comparing with our previous observations, bCALET-1 and BETS. The detector performance is studied by comparing with the simulations, and the observed fluxes are found to be compatible with the expected.

    DOI

    Scopus

    2
    Citation
    (Scopus)

  • Expected CALET telescope performance from monte carlo simulations

    Yosui Akaike, Katsuaki Kasahara, Shoji Torii, Shunsuke Ozawa, Yuki Shimizu, Mikihiko Karube, Keisuke Yoshida, Kenji Yoshida, Masakatsu Ichimura

    Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011   6   371 - 374  2011  [Refereed]

    　View Summary

    The CALorimetric Electron Telescope, CALET, is a versatile detector for exploring the high energy universe, planned to be placed on the Japanese Experiment Module Facility of the International Space Station, ISS. CALET is designed to perform direct measurements of electrons from 1 GeV to 20 TeV, gamma-rays from 10 GeV to 10 TeV, and protons and nuclei from several 10 GeV to 1000 TeV. The main detector consists of a Charge Detector (CHD), an Imaging Calorimeter (IMC), and a Total Absorption Calorimeter (TASC). The total thickness of the calorimeter is 30 X0 for electromagnetic particles or 1.3 λ for protons. We have been carrying out Monte Carlo simulations with EPICS to study the CALET performance. With its imaging and deep calorimeter, CALET provides excellent proton rejection, ∼ 105, and a high energy resolution, ∼2%, over 100 GeV for electromagnetic particles, which make possible the observation of electrons and gamma-rays into the TeV region. In this paper, we will present the expected performance in observing the different particle species, including the geometric factor, the trigger efficiency, the energy resolution and the particle identification power.

    DOI

    Scopus

    14
    Citation
    (Scopus)

  • The balloon-bone CALET prototype detector (bCALET)

    Shunsuke Ozawa, Shoji Torii, Katsuaki Kasahara, Hiroyuki Murakami, Yosui Akaike, Yoshitaka Ueyama, Daijiro Ito, Motohiko Karube, Keinosuke Kondo, Tae Niita, Tadahisa Tamura, Yusaku Katayose, Kenji Yoshida, Yoshitaka Saito, Hideyuki Fuke, Jiro Kawada

    Proceedings of the 32nd International Cosmic Ray Conference, ICRC 2011   6   71 - 74  2011  [Refereed]

    　View Summary

    The CALET payload will be installed in the Japanese Experiment Module Exposed Facility (JEM-EF) of the International Space Station (ISS). We developed a balloon-borne payload to evaluate the performance of CALET by carrying out precursor flights for the electron and gamma-ray observations. The first flight of bCALET-1 (balloon-borne CALET prototype) was carried out in 2006, and the enhanced version, bCALET-2, was successfully flown in August 2009. The bCALET-2 is composed of IMaging Calorimeter (IMC) and Total AbSorption Calorimeter (TASC). The IMC has an area of 256 mm × 256 mm, and is consisted of 8 layers of scintillating fiber belts with a total 3.6 radiation lengths of tungsten plates interleaved within the fiber planes for imaging the pre-shower development. TASC is consisted of crossed BGO logs (25 mm × 25 mm × 300 mm in each) with a total of 13.4 radiation lengths depth, for measuring the total energy deposit of incoming shower particles. The geometry factor is nearly 320 cm2sr over 10 GeV. We succeeded the observation of the electron energy spectrum in 1 GeV ∼ several 10 GeV electron and the atmospheric gamma-rays in 1 GeV ∼ a few 10 GeV, which are consistent with previous observations by BETS. The results are compared with simulations for confirming the detector performance.

    DOI

    Scopus

    1
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    (Scopus)

  • Scientific prospects of electron and gamma-ray observations with the CALET instrument on-board ISS

    Kenji Yoshida, Aya Kubota, Shoji Torii, Katsuaki Kasahara, Yosui Akaike, Tadahisa Tamura, Masaki Mori

    31st International Cosmic Ray Conference, ICRC 2009    2009

    　View Summary

    The CALorimetric Electron Telescope, CALET, is a new all-sky gamma-ray and electron observatory being developed for the Exposure Facility of Japanese Experiment Module (JEM-EF) on the International Space Station (ISS). The mission goal is to investigate high-energy universe by observing cosmic-ray electrons in 1 GeV - 20 TeV, gamma rays in 20 MeV - 10 TeV, and protons, heavier nuclei in several 10 GeV - 1 PeV. The main instrument consists of an imaging calorimeter of scintillating fibers, IMC, and a total absorption calorimeter of BGO, TASC. CALET has a unique capability to observe highenergy electrons and gamma rays with an energy resolution better than a few % above 100 GeV, an angular resolution of 0.1 deg above 100 GeV, a wide field of view of around 1.8 sr, and a hadron rejection power larger than 105. This capability enables us to search for nearby cosmic-ray sources, dark matter, and survey the variable gamma-ray sky.

  • Simulated performance of CALET on ISS orbit

    Yosui Akaike, Katsuaki Kasahara, Shoji Torii, Shunsuke Ozawa, Koichi Taira, Kenji Yoshida

    31st International Cosmic Ray Conference, ICRC 2009    2009

    　View Summary

    Calorimetric Electron Telescope, CALET, is being developed to be on board the Japanese Experiment Module Exposed Facility, JEM/EF, of the International Space Station, ISS. Major goals of the mission are to search for nearby cosmic ray sources and dark matter by carrying out a precise measurement of the electrons in 1 GeV - 20 TeV and the gamma-rays in 20 MeV - A few TeV. CALET will measure the protons and the nuclei up to 1000 TeV as well. The main detector is composed of Imaging Calorimeter, IMC, Total Absorption Calorimeter, TASC, Silicon Array, SIA, and Anti-Coincidence Detector, ACD, to detect various kinds of particles in very wide energy range. The total absorber thickness is 31 X0 for electromagnetic particles and 1.4 ̧ for protons. To get optimized CALET performance in observing each kind of particles, we have been carrying out Monte Carlo simulation. In this paper, we estimate the trigger rate at the ISS orbit by calculating the cosmic ray flux at an altitude of 400 km. The rate is 37 Hz for the shower trigger over 10 GeV, which is mainly adopted in the CALET mission. An expected performance of detector such as the geometrical factor, the energy resolution, the angular resolution and the electron/proton separation is also presented.

  • 22aSH-5 CALET開発報告32 : シミュレーション計算による原子核成分観測性能の評価(22aSH 高・超高エネルギー,宇宙線・宇宙物理領域)

    平 晃一, 笠原 克昌, 鳥居 祥二, 小澤 俊介, 有働 慈治, 赤池 陽水, 吉田 健二, CALETチーム

    日本物理学会講演概要集   63.2.1   86  2008

    DOI CiNii

  • Balloon observation of electrons and gamma rays with CALET prototype

    Y. Shimizu, S. Torii, K. Kasahara, Y. Akaike, Y. Fukuta, K. Hidaka, K. Taira, T. Tamura, K. Yoshida, Y. Katayose, H. Murakami

    Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007   2 ( 1 ) 433 - 436  2007

    　View Summary

    We carried out a balloon observation of cosmic rays using a prototype of the CALET at the Sanriku Balloon Center of the Japan Aerospace Exploration Agency. The prototype detector consists of 1024 scintillating fibers for track imaging and 24 BGO scintillator logs for total absorption of showers. The observation was carried at an altiude between 35 and 37 km for about 3.5 hours. We measured electrons and-rays in the energy region between 1 to 100 GeV, and 20 MeV to 1 GeV, respectively. In addition to verification of the prototype system, we have obtained the electron flux which is useful to investigate solar modulation. Now we are planning a series of balloon experiments with larger-scale detectors and longer-duration flights, which includes one-month observation by a super-pressure balloon.

  • Expected performance of CALET

    K. Kasahara, S. Torii, Y. Shimizu, Y. Akaike, K. Taira, K. Yoshida, I. Watanabe

    Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007   3 ( 2 ) 1433 - 1436  2007

    　View Summary

    CALET is a detector planned to be on board ISS to investigate high energy universe by observing high energy gamma-rays, electrons and other cosmic ray. It is now in the phase A/B study period of the JAXA program. The performance of CALET was studied earlier[1] but the design structure (mainly its size) has been changed since that time. We have been performing new M.C simulations corresponding to the new structure to evaluate its basic performance. This is to report some of the new results.

▼display all

Presentations

  • Direct Measurement of All-particle Spectrum up to the PeV region with CALET on the International Space Station

    Yosui Akaike

    ICRC2025 - The Astroparticle Physics Conference 

    Presentation date： 2025.07

    Event date：
    2025.07
    　
    　

  • Precise Measurement of the Electron plus Positron Spectrum with CALET on the International Space Station

    Yosui Akaike

    ICRC2025 - The Astroparticle Physics Conference 

    Presentation date： 2025.07

    Event date：
    2025.07
    　
    　

  • The Calorimetric Electron Telescope (CALET) on the International Space Station: Results from the Six Years on Orbit

    Yosui Akaike  [Invited]

    44th COSPAR Scientific Assembly 

    Presentation date： 2022.07

    Event date：
    2022.07
    　
    　

  • Direct Measurements of Cosmic Rays with the Calorimetric Electron Telescope on the International Space Station

    Yosui Akaike  [Invited]

    21st International Symposium on Very High Energy Cosmic Ray Interactions 

    Presentation date： 2022.05

    Event date：
    2022.05
    -
    2022

  • Direct cosmic-ray measurements with CALET on the International Space Station

    Yosui Akaike  [Invited]

    International Conference on High Energy Density Sciences 

    Presentation date： 2021.04

    Event date：
    2021.04
    　
    　

Research Projects

  • Search for nearby sources and dark matter signatures by precise measurement of cosmic-ray electrons in the TeV region

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    2024.04
    -
    2027.03
     

  • Research on the galactic cosmic-ray acceleration and propagation by the direct measurement of the cosmic-ray nuclei

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Project Year :

    2021.04
    -
    2024.03
     

    Akaike Yosui

    　View Summary

    In this study, we analyzed data from the Calorimetric Electron Telescope (CALET), a cosmic-ray experiment installed on the International Space Station. We derived energy spectra of cosmic-ray nuclei such as protons, He, B, C, O, Fe and Ni with unprecedented accuracy. The obtained data are crucial for understanding the acceleration and propagation of cosmic rays, including the hardening of spectra and measurements of secondary-to-primary ratios that cannot be explained by standard acceleration and propagation models. Furthermore, we also achieved results regarding the energy spectrum of electrons + positrons and the charge dependence of cosmic-ray fluxes due to solar modulation.

  • Study of the cosmic-ray acceleration and propagation with the direct observation of high-energy galactic cosmic-rays

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity Start-up

    Project Year :

    2020.09
    -
    2022.03
     

    AKAIKE Yosui

    　View Summary

    The goals of this study are to search for possible nearby cosmic-ray sources and dark matter signature with the precise measurement of the electron and positron spectrum with the CALET (CALorimetric Electron Telescope) on the International Space Station. CALET has been accumulating scientific data without any major interruptions for over six years since the start of operation in October, 2015. The significance of the spectral cutoff in TeV region is improved to 6.5σ.

  • 宇宙線電子観測の高精度化による宇宙線起源の解明

    日本学術振興会  科学研究費助成事業

    Project Year :

    2015.04
    -
    2016.03
     

    赤池 陽水

    　View Summary

    国際宇宙ステーションにおける宇宙線観測実験CALETは、宇宙線の起源や加速・伝播機構の解明を目的に、GeVからTeVの高エネルギー領域における宇宙線観測を実施している。CALETの検出器は平成27年8月に宇宙ステーション補給機「こうのとり」によって国際宇宙ステーションに搭載され10月から観測を開始した。所期の目的であるTeV領域の電子観測に成功し、高統計のエネルギースペクトルの導出に向けて長期間の観測を行っている。
    本研究では、精確なエネルギースペクトルの導出に向けて、CALETの取得データの詳細な解析を実施した。打ち上げ前に地上で取得した宇宙線ミューオンやテストパルス、及び宇宙ステーション搭載後に機上で収集した宇宙線のデータを基に、検出器全チャンネルの応答が打上前後で変化せず正常な応答を示していることを確認した。また長期間の定常観測に向けて、軌道上の観測環境に応じた観測条件の最適化を実施した。軌道上で取得したデータを基に検出器のエネルギー較正を実施するとともに、取得イベントのエネルギーや粒子種の再構成を実施し、CALETがTeV領域の電子成分のイベントを取得していることを示した。さらに陽子から鉄までの原子核、及びガンマ線が検出されていることを示した。これらの成果を基に、CALET実験は正常に初期運用を終了し、定常運用への移行を達成している。今後高統計・高精度なエネルギースペクトルの導出に向け、長期間の観測を継続すると共にデータ解析の高精度化を図る予定である。

  • 高エネルギー宇宙電子・ガンマ線観測による近傍加速源・暗黒物質の研究

    日本学術振興会  科学研究費助成事業

    Project Year :

    2012.04
    -
    2015.03
     

    赤池 陽水

    　View Summary

    銀河宇宙線の起源や加速・伝播機構の解明に向けて、国際宇宙ステーションにおける宇宙線観測実験CALETの装置開発を進めている。本研究では、シミュレーション計算や加速器ビーム実験を通じて装置性能の検証を進めてきた。またフライトモデルの製作に伴い、地上における各種動作試験や較正実験を行った。
    (1) シミュレーション計算による観測性能評価と軌道上における検出器較正手法の開発 軌道上における検出器の出力較正のため、陽子やヘリウムを利用した較正手法を検討している。シミュレーション計算を基に、出力較正に利用可能な最小電離損失粒子の選別手法を開発し、またイベントレートを見積もることにより、軌道上において現実的な時間で較正可能であることを示した。
    (2) フライトモデルの地上較正試験 CALETのフライト品の完成に伴い、検出器の組上げ試験、システム試験、熱真空試験等を実施した。各過程において、テストパルスやペデスタルのノイズレベルの評価、宇宙線ミューオンを利用した動作確認等を行ってきた。最終的なエネルギー較正に必要となる信号応答の基礎データの取得についても、紫外線パルスレーザー光を利用して全チャンネルの較正試験を実施した。
    (3) CERN-SPSにおける重粒子ビーム実験 CALETのフライトモデルと同じ構造をもつ熱構造モデルを用いて、欧州原子核研究機構CERNのSPS加速器においてArの破砕核を利用した加速器実験を実施した。この実験では、初めてカロリメータによるシャワー粒子の出力応答を検証することができたため、後方散乱の影響を含む電荷測定性能、エネルギー測定性能の検証を行った。今後詳細な解析を進め、CALETに最適なハドロン相互作用モデルの検証も行う。

  • 宇宙における高エネルギー粒子の生成・加速機構の実験的研究

    日本学術振興会  科学研究費助成事業

    Project Year :

    2009
    -
    2011
     

    赤池 陽水

    　View Summary

    本研究の目的は、高エネルギー宇宙線電子成分の観測により、近傍加速源や暗黒物質の探索を行うことである。このために、電子観測に最適な検出器を開発し、国際宇宙ステーション(International Space Station:ISS)における本格的な宇宙線観測計画(CALorimetric Electron Telescope:CALET)を進めている。高精度な電子観測を実現するためには、検出器に優れたエネルギー測定性能とバックグラウンドとなる陽子との強力な粒子識別性能が要求される。CALIETはこれらを実現するために厚いカロリメータ型の検出器を採用しており、これまでにシミュレーション計算を通じて、潜在的に高い観測能力を持つことを示している。本年度はこれらを実証するために、欧州原子核機構(CERN)におけるSPS加速器を用いたビーム試験を実施した。電子10-290GeV、陽子30-350GeVのビームをCALETのプロトタイプとなる検出器に照射し、シャワーの粒子数分布やエネルギー分解能、粒子識別において重要なパラメータとなるシャワーの横拡がりや遷移曲線について、電子、陽子の各粒子、各エネルギーにおける実験データの解析を進めている。これらの実験データは、CALETにおける開発要素の技術実証やISSにおける観測性能の実証に加えて、シミュレーション計算で再現することにより、CALETの解析手法の検証やシミュレーション計算自体の精度向上の点で大きな成果が得られている。また今回のビーム試験では、高統計の陽子イベントを取得しており、今後さらに詳細に解析を進めることで、シミュレーション計算において最も不定性の大きいハドロン相互作用モデルについて、CALETに最も適したモデル選別の検証も実施する予定である。

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Misc

  • Repetition period of REP and chorus observed during the conjunction event of ISS/CALET and the Arase satellite

    ARAI Madoka, KATOH Yuto, KATAOKA Ryuho, TERAMOTO Mariko, KUMAMOTO Atsushi, TSUCHIYA Fuminori, KASABA Yasumasa, MIYOSHI Yoshizumi, KASAHARA Yoshiya, MATSUDA Shoya, SHINOHARA Iku, YAMAMOTO Kazuhiro, MATSUOKA Ayako, HORI Tomoaki, SHINBORI Atsuki, TORII Shoji, AKAIKE Yosui

    地球電磁気・地球惑星圏学会総会及び講演会(Web)   156th  2024

    J-GLOBAL

  • Search for electromagnetic counterparts of gravitational wave events during the O4 period with CALET

    川久保雄太, CHERRY M.L., 赤池陽水, 小林兼好, 鳥居祥二, 森正樹, 坂本貴紀, 吉田篤正, CANNADY N.

    日本物理学会講演概要集(CD-ROM)   78 ( 2 )  2023

    J-GLOBAL

  • Search for gamma-ray spectral lines from Galactic dark matter interactions with CALET

    森正樹, 赤池陽水, 小林兼好, 鳥居祥二, CANNADY N., 川久保雄太, CHERRY M.L.

    日本物理学会講演概要集(CD-ROM)   77 ( 2 )  2022

    J-GLOBAL

  • 宇宙線源分布の統計的揺らぎとCALET電子・陽電子宇宙線スペクトル

    浅野勝晃, 浅岡陽一, 赤池陽水, 川中宣太, 郡和範, MOTZ H. M., 寺澤敏夫

    日本天文学会年会講演予稿集   2022  2022

    J-GLOBAL

  • The study of charge resolution and radiation hardness of the charge detector for CALET

    小澤俊介, 鳥居祥二, 小谷太郎, 中川友進, 赤池陽水, 植山良貴, 近藤慧之輔, 仁井田多絵, 九反万里恵, 中村政則, 二宮翔太, 舟橋亮輔, 吉田圭佑, 渡邊仁規, 内堀幸夫, 北村尚, 清水雄輝, 片寄祐作

    NIRS-M (National Inst. of Radiological Sciences)   ( 251 )  2012

    J-GLOBAL

  • The Charge resolution of silicone pixel array detector for CALET

    小澤俊介, 鳥居祥二, 清水雄輝, 赤池陽水, 相場俊英, 植山良貴, 伊藤大二郎, 苅部樹彦, 近藤慧之輔, 仁井田多絵, 内堀幸夫, 北村尚, 片寄祐作

    NIRS-M (National Inst. of Radiological Sciences)   ( 244 )  2011

    J-GLOBAL

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Internal Special Research Projects

  • 国際宇宙ステーションにおける宇宙線高精度観測による宇宙線電子起源の解明

    2015  

    　View Summary

    本研究は、2015年8月に国際宇宙ステーションに搭載された宇宙線観測装置CALETによる観測データを基に、高エネルギー宇宙線の起源や加速・伝播機構の解明を目指している。本研究では打ち上げ前後の地上試験や初期運用時の収集データの解析を通じて、検出器が性能要求を満たす観測性能を有しており、打上げ前後で変わらない観測性能を示していることを確認した。また観測データの解析を実施し、所期の目的であるTeV領域の宇宙線電子成分の直接観測を達成した。本研究で得られた研究成果は、今後の詳細なデータ解析の基礎として重要であり、精緻なエネルギースペクトルの導出のため、高統計なデータ収集及びデータ解析を今後実施する予定である。