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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1909.12860 (astro-ph)
[Submitted on 27 Sep 2019 (v1), last revised 1 Oct 2019 (this version, v2)]

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

Authors:Q. An, R. Asfandiyarov, P. Azzarello, P. Bernardini, X. J. Bi, M. S. Cai, J. Chang, D. Y. Chen, H. F. Chen, J. L. Chen, W. Chen, M. Y. Cui, T. S. Cui, H. T. Dai, A. D'Amone, A. De Benedittis, I. De Mitri, M. Di Santo, M. Ding, T. K. Dong, Y. F. Dong, Z. X. Dong, G. Donvito, D. Droz, J. L. Duan, K. K. Duan, D. D'Urso, R. R. Fan, Y. Z. Fan, F. Fang, C. Q. Feng, L. Feng, P. Fusco, V. Gallo, F. J. Gan, M. Gao, F. Gargano, K. Gong, Y. Z. Gong, D. Y. Guo, J. H. Guo, X. L. Guo, S. X. Han, Y. M. Hu, G. S. Huang, X. Y. Huang, Y. Y. Huang, M. Ionica, W. Jiang, X. Jin, J. Kong, S. J. Lei, S. Li, W. L. Li, X. Li, X. Q. Li, Y. Li, Y. F. Liang, Y. M. Liang, N. H. Liao, C. M. Liu, H. Liu, J. Liu, S. B. Liu, W. Q. Liu, Y. Liu, F. Loparco, C. N. Luo, M. Ma, P. X. Ma, S. Y. Ma, T. Ma, X. Y. Ma, G. Marsella, M. N. Mazziotta, D. Mo, X. Y. Niu, X. Pan, W. X. Peng, X. Y. Peng, R. Qiao, J. N. Rao, M. M. Salinas, G. Z. Shang, W. H. Shen, Z. Q. Shen, Z. T. Shen, J. X. Song, H. Su, M. Su, Z. Y. Sun, A. Surdo, X. J. Teng, A. Tykhonov, S. Vitillo, C. Wang, H. Wang, H. Y. Wang, J. Z. Wang, L. G. Wang et al. (54 additional authors not shown)  You must enable JavaScript to view entire author list.
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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 two and a half years of data recorded by the DArk Matter Particle Explorer (DAMPE). This is the first time an experiment directly measures the cosmic ray protons up to ~100 TeV with a high statistics. The measured spectrum confirms the spectral hardening 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.
Comments: 37 pages, 5 figures, published in Science Advances
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:1909.12860 [astro-ph.HE]
  (or arXiv:1909.12860v2 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1909.12860
Journal reference: Science Advances, Vol. 5, no. 9, eaax3793 (2019)
Related DOI: https://doi.org/10.1126/sciadv.aax3793

Submission history

From: Chuan Yue [view email]
[v1] Fri, 27 Sep 2019 18:14:27 UTC (136 KB)
[v2] Tue, 1 Oct 2019 02:10:55 UTC (136 KB)
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