Update of the Helium flux measurement with CALET on the International Space Station
The CALorimetric Electron Telescope (CALET) is a space-based calorimetric instrument, designed to carry out precise measurements of high energy cosmic rays. Installed on the Japanese Experiment Module - Exposed Facility on the ISS, it is collecting data with excellent performance and no significant interruptions since October 2015. We present the updated results of the direct measurement of the energy spectrum of cosmic-ray helium, based on more than 9 years of collected data, with an expected statistical increase of about 40% compared with the previously published measurement. The helium flux shows significant deviations from a single power law with a progressive hardening around a few hundred GeV followed by a softening in the multi-TeV region. The increase in statistics allows to extend the upper limit of the measured energy range and to improve the precision of the measurement itself in the high energy part of the spectrum.
Authors
- M. Mattiazzi (ORCID: https://orcid.org/0000-0003-3900-6816)
- P. Brogi (ORCID: https://orcid.org/0000-0001-7953-0271)
- Kazuyoshi Kobayashi (ORCID: https://orcid.org/0000-0003-1533-3476)
Publication Details
- Published
- 2025-09-23
- DOI
- https://doi.org/10.22323/1.501.0019
- Primary Topic
- Atomic and Subatomic Physics Research
- 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