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

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      Science Advances
      American Association for the Advancement of Science (AAAS)

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          Abstract

          The precise measurement of the spectrum of protons, the most abundant component of the cosmic radiation, is necessary to understand the source and acceleration of cosmic rays in the Milky Way. This work reports the measurement of the cosmic ray proton fluxes with kinetic energies from 40 GeV to 100 TeV, with 2 1/ 2 years of data recorded by the DArk Matter Particle Explorer (DAMPE). This is the first time that an experiment directly measures the cosmic ray protons up to ~100 TeV with high statistics. The measured spectrum confirms the spectral hardening at ~300 GeV found by previous experiments and reveals a softening at ~13.6 TeV, with the spectral index changing from ~2.60 to ~2.85. Our result suggests the existence of a new spectral feature of cosmic rays at energies lower than the so-called knee and sheds new light on the origin of Galactic cosmic rays.

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          Most cited references43

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          On the Origin of the Cosmic Radiation

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            A multidimensional unfolding method based on Bayes' theorem

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              Precision Measurement of the Proton Flux in Primary Cosmic Rays from Rigidity 1 GV to 1.8 TV with the Alpha Magnetic Spectrometer on the International Space Station

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                Author and article information

                Journal
                Science Advances
                Sci. Adv.
                American Association for the Advancement of Science (AAAS)
                2375-2548
                September 27 2019
                September 2019
                September 27 2019
                September 2019
                : 5
                : 9
                : eaax3793
                Article
                10.1126/sciadv.aax3793
                7aeebcf8-0c7c-435f-b27f-3342b846d6c2
                © 2019
                History

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