Measurement of the cosmic ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite

astro-ph.HE High Energy Astrophysical Phenomena (astro-ph.HE) DAMPE Collaboration FOS: Physical sciences Particle and High Energy Physics Nuclear and Plasma Physics 530 01 natural sciences 7. Clean energy 520 Physical Sciences 0103 physical sciences Astrophysics - High Energy Astrophysical Phenomena Research Articles
DOI: 10.1126/sciadv.aax3793 Publication Date: 2019-09-28T02:15:16Z
AUTHORS (155)
ABSTRACT
The precise measurement of the spectrum protons, most abundant component cosmic radiation, is necessary to understand source and acceleration rays in Milky Way. This work reports ray proton fluxes with kinetic energies from 40 GeV 100 TeV, two a half years data recorded by DArk Matter Particle Explorer (DAMPE). first time an experiment directly measures protons up ~100 TeV high statistics. measured confirms spectral hardening found previous experiments reveals softening at ~13.6 index changing ~2.60 ~2.85. Our result suggests existence new feature lower than so-called knee, sheds light on origin Galactic rays.
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