Precise measurement of the electron plus positron spectrum with CALET on the International Space Station
The primary objectives of the CALorimetric Electron Telescope (CALET) mission are to search for possible nearby cosmic-ray sources and dark matter signatures through the precise measurement of the electron plus positron (all-electron) spectrum. The instrument is optimized to measure the all-electron spectrum well into the TeV region, with a total thickness of 30 radiation lengths at normal incidence and fine shower imaging capability. These capabilities provide an excellent energy resolution of 2\% over a wide energy range from 20~GeV to 20~TeV, and enable highly precise measurements by suppressing hadron contamination to below a few percent. CALET has been accumulating scientific data for more than nine years on the International Space Station without major interruption. In this study, we will present the latest results of the all-electron spectrum with high-statistics data, and briefly discuss its interpretation regarding nearby electron sources at the TeV region.
Authors
- S. Torii (ORCID: https://orcid.org/0000-0003-3363-3827)
- Yosui Akaike (ORCID: https://orcid.org/0000-0002-9489-1515)
Publication Details
- Published
- 2025-09-23
- DOI
- https://doi.org/10.22323/1.501.0005
- Primary Topic
- Muon and positron interactions and applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Aeronautics and Space Administration
- University of Maryland, Baltimore County
- University of Chicago
- Nihon University
- Louisiana State University
- University of Denver
- Università degli Studi di Siena
- Ministry of Education, Culture, Sports, Science and Technology
- Università degli Studi di Padova
- Okinawa Institute of Science and Technology Graduate University
- Waseda University
- Università degli Studi di Firenze
- University of Tokyo
- Aoyama Gakuin University
- Ritsumeikan University
- Hirosaki University
- Kanagawa University
- National Astronomical Observatory of Japan
- High Energy Accelerator Research Organization
- Università di Pisa
- Iran Telecommunication Research Center
- Tokyo Metropolitan University
- Goddard Space Flight Center
- College of Science and Engineering, University of Minnesota
- Japan Society for the Promotion of Science
- Japan Aerospace Exploration Agency
- National Institute of Information and Communications Technology
- Institute of Space and Astronautical Science