Energy spectra of carbon and oxygen cosmic rays with CALET on the International Space Station

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https://pos.sissa.it/395/093

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https://doi.org/10.22323/1.395.0093
 http://hdl.handle.net/11603/25333

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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

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Author/Creator ORCID

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

Date

2022-03-18

Type of Work

conference papers and proceedings
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Citation of Original Publication

"Energy spectra of carbon and oxygen cosmic rays with CALET on the International Space Station,” P. Maestro for the CALET Collaboration, Proceedings of Science: 37th International Cosmic Ray Conference, (Berlin, Germany), 093 (2021). https://doi.org/10.22323/1.395.0093

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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

We present the measurements of the energy spectra of carbon and oxygen nuclei in cosmic rays based on 4 years of observation with the Calorimetric Electron Telescope (CALET) on the International Space Station. The energy spectra are measured 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 and equipped with charge detectors capable of single element resolution. Data analysis, including the detailed assessment of systematic uncertainties, and results are reported. The observed carbon and oxygen fluxes show a spectral hardening around 200 GeV/n established with a significance > 3σ. They have the same energy dependence and a constant C/O flux ratio above 25 GeV/n. These measurements will contribute to a better understanding of the origin of the spectral hardening.