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Choi, G. H.; Seo, E. S.; Aggarwal, S.; Amare, Y.; Angelaszek, D.; Bowman, D. P.; Chen, Y. C.; Copley, M.; Derome, L.; Eraud, L.; Falana, C.; Gerrety, A.; Han, J. H.; Huh, H. G.; Haque, A.; Hwang, Y. S.; Hyun, H. J.; Jeon, H. B.; Jeon, J. A.; Jeong, S.; Kang, S. C.; Kim, H. J.; Kim, K. C.; Kim, M. H.; Lee, H. Y.; Lee, J.; Lee, M. H.; Lu, L.; Lundquist, J. P.; Lutz, L.; Menchaca-Rocha, A.; Ofoha, O.; Park, H.; Park, I. H.; Park, J. M.; Picot-Clemente, N.; Scrandis, R.; Smith, J. R.; Takeishi, R.; Vedenkin, N.; Walpole, P.; Weinmann, R. P.; Wu, H.; Wu, J.; Yin, Z.; Yoon, Y. S.; Zhang, H. G.
The Astrophysical journal, 12/2022, Letnik: 940, Številka: 2Journal Article
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 × 10 3 to 6.55 × 10 5 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 × 10 3 GeV from 2.57 ± 0.03 to 2.82 ± 0.02 with a significance of greater than 3 σ . 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.
