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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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arxiv 1909.12860 v2 pith:LRELVLU6 submitted 2019-09-27 astro-ph.HE

Q. An , R. Asfandiyarov , P. Azzarello , P. Bernardini , X. J. Bi , M. S. Cai , J. Chang , D. Y. Chen
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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 Q. Wang S. Wang X. H. Wang X. L. Wang Y. F. Wang Y. P. Wang Y. Z. Wang Z. M. Wang D. M. Wei J. J. Wei Y. F. Wei S. C. Wen D. Wu J. Wu L. B. Wu S. S. Wu X. Wu K. Xi Z. Q. Xia H. T. Xu Z. H. Xu Z. L. Xu Z. Z. Xu G. F. Xue H. B. Yang P. Yang Y. Q. Yang Z. L. Yang H. J. Yao Y. H. Yu Q. Yuan C. Yue J. J. Zang F. Zhang J. Y. Zhang J. Z. Zhang P. F. Zhang S. X. Zhang W. Z. Zhang Y. Zhang Y. J. Zhang Y. L. Zhang Y. P. Zhang Y. Q. Zhang Z. Zhang Z. Y. Zhang H. Zhao H. Y. Zhao X. F. Zhao C. Y. Zhou Y. Zhou X. Zhu Y. Zhu S. Zimmer (DAMPE collaboration)
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keywords cosmicmeasurementraysspectralspectrumdampeenergiesproton
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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.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Uncertainty in Hadronic Diffuse $\gamma$-Ray Emission from the Temporal Stochasticity of Cosmic-Ray Sources

    astro-ph.HE 2025-09 conditional novelty 6.0 of 10

    Temporal stochasticity of cosmic-ray sources causes a normalization uncertainty in the local proton flux that propagates into a hadronic gamma-ray uncertainty of 30-100%, comparable to or exceeding experimental errors...

  2. LHAASO protons versus LHAASO diffuse gamma-rays: a consistency check

    astro-ph.HE 2025-06 conditional novelty 6.0 of 10

    The LHAASO proton spectrum, folded with gas maps and interaction models, predicts a diffuse gamma-ray flux that exceeds LHAASO's measured diffuse gamma-ray flux, especially in the inner Galaxy.

  3. Implication of multiple source populations of Galactic cosmic rays from proton and helium spectra

    astro-ph.HE 2025-11 conditional novelty 5.0 of 10

    The proton and helium spectra from 1 GeV to 10 PeV can be reproduced only by adding two local sources or a second background population on top of the standard cosmic-ray background.

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