Precise Measurement of the Cosmic-Ray Electron and Positron Spectrum with CALET on the International Space Station

Thumbnail Image

Files

ICRC2021_105.pdf (2.32 MB)

Links to Files

https://pos.sissa.it/395/105/

Permanent Link

https://doi.org/10.22323/1.395.0105
 http://hdl.handle.net/11603/25337

Collections

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

Date

2022-03-18

Type of Work

conference papers and proceedings
Text

Department

Program

Citation of Original Publication

“Precise Measurement of the Cosmic-Ray Electron and Positron Spectrum with CALET on the International Space Station,” S. Torii and Y. Akaike for the CALET Collaboration, Proceedings of Science: 37th International Cosmic Ray Conference , (Berlin, Germany), 105 (2021). https://doi.org/10.22323/1.395.0105

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

Subjects

Abstract

Primary objectives of the CALET (CALorimetric Electron Telescope) mission are to search for possible nearby cosmic-ray sources and dark matter signatures with the precise measurement of the electron and positron (all-electron) spectrum. The instrument, consisting of a charge detector, an imaging calorimeter and a total absorption calorimeter, is optimized to measure the all-electron spectrum well into the TeV region with a thick calorimeter of 30 radiation length with fine shower imaging capability. Due to the excellent energy resolution (a few % above 10 GeV) and the outstanding e/p separation (~10^5), CALET achieves optimal performance for a detailed search for structures in the energy spectrum. CALET has been accumulating scientific data for more than five years without any major interruption, and the statistics of observed electron events has increased more than double since the latest publication in 2018. In this paper we will present precise measurements of the all-electron spectrum up to several TeV, as obtained with the high statistics data, and we will briefly discuss about its interpretation.