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

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ICRC2023_054.pdf (536.02 KB)

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https://pos.sissa.it/444/054/

Permanent Link

https://doi.org/10.22323/1.444.0054
 http://hdl.handle.net/11603/36420

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection

Author/Creator

Author/Creator ORCID

https://orcid.org/0000-0003-2916-6955
 https://orcid.org/0000-0002-9247-3010

Date

2023-07-25

Type of Work

conference papers and proceedings
Text

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Citation of Original Publication

Adriani, Oscar, Yosui Akaike, Katsuaki Asano, Yoichi Aaoka, Eugenio Berti, Gabriele Bigongiari, Walter Robert Binns, et al. “Helium Flux and Its Ratio to Proton Flux in Cosmic Rays Measured with CALET on the International Space Station.” In Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023), 444:054. SISSA Medialab, 2023. https://doi.org/10.22323/1.444.0054.

Rights

This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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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.