Abstract
Abstract
The Cosmic Ray Energetics And Mass for the International Space Station (ISS-CREAM) experiment successfully recorded data for 539 days from 2017 August to 2019 February. We report the energy spectrum of cosmic-ray protons from the ISS-CREAM experiment at energies from 1.60 × 103 to 6.55 × 105 GeV. The measured spectrum deviates from a single power law. A smoothly broken power-law fit to the data, including statistical and systematic uncertainties, shows the spectral index change at 9.0 × 103 GeV from 2.57 ± 0.03 to 2.82 ± 0.02 with a significance of greater than 3σ. This bump-like structure is consistent with a spectral softening recently reported by the balloon-borne CREAM, DAMPE, and NUCLEON, but ISS-CREAM extends measurements to higher energies.
Funder
National Aeronautics and Space Administration
National Research Foundation of Korea
CNRS ∣ Institut National de Physique Nucléaire et de Physique des Particules
Centre National d’Etudes Spatiales
UNAM ∣ Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México
MSIT ∣ Institute for Information and Communications Technology Promotion
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
12 articles.
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