2020/09/30 by Jia-Shu Niu · 1 citation
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #COSMIC cancer database #Computational physics #Cosmic ray #Dark Matter and Cosmic Phenomena #Hardening (computing) #Materials science #Nuclear physics #Particle physics theoretical and experimental studies #Physics #Power law #Rigidity (electromagnetism) #Spectral index #Spectral line #Spectral shape analysis #Statistics #Superposition principle #astro-ph.HE
paper · pdf · doi:10.1088/1674-1137/abe03d
published as Chinese Physics C Vol. 45, No. 4 (2021) 041004 · 8 pages, 1 table, 5 figures
openalex publication_date 2021/01/27 · arxiv created 2021/03/20 · arxiv updated 2021/03/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract Many experiments have confirmed spectral hardening at a few hundred GeV in the spectra of cosmic ray (CR) nuclei. Three different origins have been proposed: primary source acceleration, propagation, and the superposition of different kinds of sources. In this work, a broken power law has been employed to fit each of the spectra of cosmic ray nuclei from AMS-02 directly, for rigidities greater than 45 GeV. The fitting results of the break rigidity and the spectral index differences less than and greater than the break rigidity show complicated relationships among different nuclear species, which cannot be reproduced naturally by a simple primary source scenario or a propagation scenario. However, with a natural and simple assumption, the superposition of different kinds of sources could have the potential to explain the fitting results successfully. Spectra of CR nuclei from a single future experiment, such as DAMPE, will provide us the opportunity to do cross checks and reveal the properties of the different kinds of sources.