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

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https://doi.org/10.22323/1.395.0098
 http://hdl.handle.net/11603/25334

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
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Author/Creator ORCID

https://orcid.org/0000-0003-2916-6955

Date

2022-03-18

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conference papers and proceedings
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Citation of Original Publication

“Extended measurement of the proton spectrum with CALET on the International Space Station,” K. Kobayashi and P. S. Marrocchesi for the CALET Collaboration, Proceedings of Science: 37th International Cosmic Ray Conference , (Berlin, Germany), 098 (2021). https://doi.org/10.22323/1.395.0098

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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

CALET is aiming to measure the main components of high energy cosmic rays up to ~1 PeV in order to understand the cosmic ray acceleration and propagation. Using CALET data from Oct. 2015 to Sep. 2020, we have extended the measurement of the cosmic ray proton spectrum from PRL2019. Statistics has been increased by more than two years. We confirm the spectral hardening around ~500GeV that was reported in PRL2019. We also expand the energy region to E<60TeV and observed a spectral softening in E>10TeV as well. By double broken power law fitting, it is obtained that the hardening at 550±130GeV and the softening at 11±4TeV.