The CALorimetric Electron Telescope (CALET) is a space-based calorimetric instrument, designed to carry out precision measurements of high energy cosmic rays. Installed on the Japanese Experiment Module - Exposed Facility on the ISS, it is collecting data with excellent performance and no significant interruptions since October 2015. We present the results of a direct measurement of the energy spectrum of cosmic-ray helium, based on about 6.5 years of collected data. It shows significant deviations from a single power law with a progressive hardening around a few hundred GeV followed by a softening in the multi-TeV region. A measurement of the proton to helium flux ratio is also presented. Thanks to the recent update of the CALET proton flux with higher statistics, the p/He ratio is measured with high precision, extending the energy reach of previous measurements with magnetic spectrometers by more than one order of magnitude.
Helium flux and its ratio to proton flux in cosmic rays measured with CALET on the International Space Station / Brogi, Paolo;Kobayashi, Kenko;Adriani, Oscar;Akaike, Yosui;Asano, Katsuaki;Asaoka, Yoichi;Berti, Eugenio;Bigongiari, Gabriele;Binns, Walter Robert;Bongi, Massimo;Bruno, Alessandro;Cannady, Nicholas Wade;Castellini, Guido;Checchia, Caterina;Cherry, Walter Robert;Collazuol, Gianmaria;de Nolfo, Georgia A.;Ebisawa, Ken;Ficklin, Anthony W.;Fuke, Hideyuki;Gonzi, Sandro;Guzik, T. Gregory;Hams, Thomas;Hibino, Kinya;Ichimura, Masakatsu;Ioka, Kunihito;Ishizaki, Wataru;Israel, Martin H.;Kasahara, Katsumasa;Kataoka, Jun;Kataoka, Ryuho;Katayose, Yusaku;Kato, Chihiro;Kawanaka, Norita;Kawakubo, Yuta;Kohri, Kazunori;Krawczynski, Henric S.;Krizmanic, John F.;Maestro, Paolo;Marrocchesi, Pier Simone;Messineo, Alberto Maria;Mitchell, Jason W.;Miyake, Shoko;Moiseev, Alexander;Mori, Masaki;Mori, Nicola;Motz, Holger Martin;Munakata, Kazuoki;Nakahira, Satoshi;Nishimura, Jun;Okuno, Shoji;Ormes, Jonathan;Ozawa, Shunsuke;Pacini, Lorenzo;Papini, Paolo;Rauch, Brian Flint;Ricciarini, Sergio Bruno;Sakai, Kazuhiro;Sakamoto, Takanori;Sasaki, Makoto;Shimizu, Yuki;Shiomi, Atsushi;Spillantini, Piero;Stolzi, Francesco;Sugita, Satoshi;Sulaj, Arta;Takita, Masato;Tamura, Tadahisa;Terasawa, Toshio;Torii, Shoji;Tsunesada, Yoshiki;Uchihori, Yukio;Vannuccini, Elena;Wefel, John P.;Yamaoka, Kazutaka;Yanagita, Shohei;Yoshida, Atsumasa;Yoshida, Kenji;Zober, Wolfgang V. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - ELETTRONICO. - 444 - 38th International Cosmic Ray Conference (ICRC2023):(2024), pp. 054.0-054.0. [10.22323/1.444.0054]
Helium flux and its ratio to proton flux in cosmic rays measured with CALET on the International Space Station
Adriani, Oscar;Berti, Eugenio;Bongi, Massimo;Gonzi, Sandro;Spillantini, Piero;
2024
Abstract
The CALorimetric Electron Telescope (CALET) is a space-based calorimetric instrument, designed to carry out precision measurements of high energy cosmic rays. Installed on the Japanese Experiment Module - Exposed Facility on the ISS, it is collecting data with excellent performance and no significant interruptions since October 2015. We present the results of a direct measurement of the energy spectrum of cosmic-ray helium, based on about 6.5 years of collected data. It shows significant deviations from a single power law with a progressive hardening around a few hundred GeV followed by a softening in the multi-TeV region. A measurement of the proton to helium flux ratio is also presented. Thanks to the recent update of the CALET proton flux with higher statistics, the p/He ratio is measured with high precision, extending the energy reach of previous measurements with magnetic spectrometers by more than one order of magnitude.
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