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

      DAMPE Collaboration * , 1 , 2 , 3 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 8 , 9 , 7 , 8 , 1 , 2 , 10 , 7 , 8 , 8 , 11 , 1 , 2 , 4 , 5 , 4 , 5 , 12 , 13 , 4 , 5 , 7 , 10 , 8 , 6 , 11 , 14 , 3 , 10 , 7 , 8 , 15 , 6 , 8 , 9 , 10 , 1 , 2 , 8 , 14 , 16 , 3 , 1 , 2 , 6 , 14 , 6 , 8 , 6 , 8 , 9 , 8 , 9 , 11 , 8 , 1 , 2 , 8 , 8 , 15 , 8 , 9 , 1 , 2 , 10 , 8 , 7 , 8 , 11 , 8 , 11 , 10 , 8 , 11 , 8 , 1 , 2 , 8 , 10 , 1 , 2 , 10 , 8 , 14 , 16 , 8 , 9 , 11 , 8 , 9 , 1 , 2 , 8 , 11 , 4 , 5 , 14 , 10 , 10 , 8 , 9 , 6 , 8 , 6 , 11 , 3 , 11 , 11 , 7 , 8 , 1 , 2 , 11 , 10 , 8 , 17 , 10 , 5 , 11 , 3 , 3 , 1 , 2 , 11 , 6 , 6 , 11 , 1 , 2 , 7 , 8 , 10 , 1 , 2 , 1 , 2 , 7 , 8 , 7 , 8 , 12 , 13 , 8 , 9 , 8 , 1 , 2 , 1 , 2 , 6 , 8 , 9 , 1 , 2 , 11 , 3 , 10 , 8 , 9 , 11 , 8 , 9 , 8 , 1 , 2 , 11 , 10 , 10 , 10 , 10 , 10 , 10 , 8 , 9 , 7 , 8 , 8 , 6 , 6 , 10 , 8 , 10 , 11 , 7 , 8 , 10 , 1 , 2 , 10 , 7 , 8 , 8 , 1 , 2 , 6 , 10 , 11 , 11 , 10 , 1 , 2 , 11 , 3

      Science Advances

      American Association for the Advancement of Science

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          Abstract

          DAMPE satellite has directly measured the cosmic ray proton spectrum from 40 GeV to 100 TeV and revealed a new feature at about 13.6 TeV.

          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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                Author and article information

                Affiliations
                [1 ]State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China.
                [2 ]Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China.
                [3 ]Department of Nuclear and Particle Physics, University of Geneva, Geneva CH-1211, Switzerland.
                [4 ]Dipartimento di Matematica e Fisica E. De Giorgi, Università del Salento, I-73100 Lecce, Italy.
                [5 ]Istituto Nazionale di Fisica Nucleare (INFN)–Sezione di Lecce, I-73100 Lecce, Italy.
                [6 ]Institute of High Energy Physics, Chinese Academy of Sciences, Yuquan Road 19B, Beijing 100049, China.
                [7 ]University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, China.
                [8 ]Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210033, China.
                [9 ]School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China.
                [10 ]Institute of Modern Physics, Chinese Academy of Sciences, Nanchang Road 509, Lanzhou 730000, China.
                [11 ]National Space Science Center, Chinese Academy of Sciences, Nanertiao 1, Zhongguancun, Haidian District, Beijing 100190, China.
                [12 ]Gran Sasso Science Institute (GSSI), Via Iacobucci 2, I-67100 L’Aquila, Italy.
                [13 ]Istituto Nazionale di Fisica Nucleare (INFN)–Laboratori Nazionali del Gran Sasso, Assergi, I-67100 L’Aquila, Italy.
                [14 ]Istituto Nazionale di Fisica Nucleare (INFN)–Sezione di Bari, I-70125, Bari, Italy.
                [15 ]Istituto Nazionale di Fisica Nucleare (INFN)–Sezione di Perugia, I-06123 Perugia, Italy.
                [16 ]Dipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari, I-70126 Bari, Italy.
                [17 ]Department of Physics and Laboratory for Space Research, The University of Hong Kong, Pok Fu Lam, Hong Kong, China.
                Author notes
                [* ]Corresponding author. Email: dampe@ 123456pmo.ac.cn
                [†]

                Deceased.

                [‡]

                Present address: Università di Sassari, Dipartimento di Chimica e Farmacia, I-07100 Sassari, Italy.

                Journal
                Sci Adv
                Sci Adv
                SciAdv
                advances
                Science Advances
                American Association for the Advancement of Science
                2375-2548
                September 2019
                27 September 2019
                : 5
                : 9
                6868675 aax3793 10.1126/sciadv.aax3793
                Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

                This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

                Funding
                Funded by: doi http://dx.doi.org/10.13039/501100001809, National Natural Science Foundation of China;
                Award ID: 11525313, 11622327, 11722328, U1738205, U1738207, U1738208
                Funded by: National key R&D program of China;
                Award ID: 2016YFA0400200
                Categories
                Research Article
                Research Articles
                SciAdv r-articles
                Physics
                Physics
                Custom metadata
                Jeanelle Ebreo

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