CALET Observations during the First 5 Years on the ISS

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Marrocchesi2021_Article_CALETObservationsDuringTheFirs.pdf (1.5 MB)

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https://link.springer.com/article/10.1134/S1063778821130214

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https://doi.org/10.1134/S1063778821130214
 http://hdl.handle.net/11603/24065

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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
UMBC Physics Department

Author/Creator

Author/Creator ORCID

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

Date

2021-12-29

Type of Work

journal articles
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Program

Citation of Original Publication

Marrocchesi, P.S., Adriani, O., Akaike, Y. et al. CALET Observations during the First 5 Years on the ISS. Phys. Atom. Nuclei 84, 985–994 (2021). https://doi.org/10.1134/S1063778821130214

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.
Public Domain Mark 1.0

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Abstract

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.