Measurement of the Cosmic P+he Energy Spectrum from 50 GeV to 0.5 PeV with the DAMPE Space Mission

DAMPE Collaboration,F. Alemanno, C. Altomare, Q. An, P. Azzarello,F. C. T. Barbato, P. Bernardini, X. J. Bi, I. Cagnoli,M. S. Cai,E. Casilli,E. Catanzani, J. Chang, D. Y. Chen, J. L. Chen, Z. F. Chen, P. Coppin,M. Y. Cui,T. S. Cui,Y. X. Cui, H. T. Dai,A. De Benedittis,I. De Mitri, F. de Palma, M. Deliyergiyev, A. Di Giovanni,M. Di Santo, Q. Ding,T. K. Dong,Z. X. Dong,G. Donvito, D. Droz,J. L. Duan,K. K. Duan,R. R. Fan, Y. Z. Fan, F. Fang, K. Fang, C. Q. Feng, L. Feng, M. Fernandez Alonso, J. M. Frieden, P. Fusco, M. Gao, F. Gargano, K. Gong, Y. Z. Gong, D. Y. Guo, J. H. Guo,S. X. Han, Y. M. Hu, G. S. Huang, X. Y. Huang, Y. Y. Huang, M. Ionica, L. Y. Jiang, Y. Z. Jiang, W. Jiang, J. Kong, A. Kotenko,D. Kyratzis,S. J. Lei, W. H. Li, W. L. Li, X. Li, X. Q. Li,Y. M. Liang, C. M. Liu, H. Liu, J. Liu, S. B. Liu, Y. Liu, F. Loparco,C. N. Luo, M. Ma, P. X. Ma, T. Ma, X. Y. Ma, G. Marsella, M. N. Mazziotta, D. Mo,M. Muñoz Salinas, X. Y. Niu, X. Pan, A. Parenti, W. X. Peng, X. Y. Peng,C. Perrina, E. Putti-Garcia, R. Qiao, J. N. Rao,A. Ruina,Z. Shangguan, W. H. Shen,Z. Q. Shen, Z. T. Shen,L. Silveri, J. X. Song, M. Stolpovskiy, H. Su, M. Su,H. R. Sun, Z. Y. Sun, A. Surdo, X. J. Teng, A. Tykhonov, J. Z. Wang, L. G. Wang, S. Wang, S. X. Wang, X. L. Wang, Y. Wang, Y. F. Wang, Y. Z. Wang, Z. M. Wang, D. M. Wei, J. J. Wei, Y. F. Wei, D. Wu, J. Wu, L. B. Wu, S. S. Wu, X. Wu,Z. Q. Xia, H. T. Xu, J. Xu, Z. H. Xu, Z. L. Xu, E. H. Xu, Z. Z. Xu,G. F. Xue, H. B. Yang, P. Yang, Y. Q. Yang, H. J. Yao, Y. H. Yu,G. W. Yuan, Q. Yuan, C. Yue, J. J. Zang, S. X. Zhang,W. Z. Zhang,Yan Zhang,Yi Zhang,Y. J. Zhang,Y. L. Zhang,Y. P. Zhang,Y. Q. Zhang,Z. Zhang,Z. Y. Zhang, C. Zhao, H. Y. Zhao, X. F. Zhao, C. Y. Zhou, Y. Zhu

Physical Review D（2024）

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Abstract

Recent observations of the light component of the cosmic-ray spectrum have revealed unexpected features that motivate further and more precise measurements up to the highest energies. The Dark Matter Particle Explorer is a satellite-based cosmic-ray experiment that has been operational since December 2015, continuously collecting data on high-energy cosmic particles with very good statistics, energy resolution, and particle identification capabilities. In this work, the latest measurements of the energy spectrum of proton+helium in the energy range from 46 GeV to 464 TeV are presented. Among the most distinctive features of the spectrum, a spectral hardening at 600 GeV has been observed, along with a softening at 29 TeV measured with a 6.6σ significance. Moreover, the detector features and the analysis approach allowed for the extension of the spectral measurement up to the sub-PeV region. Even if with small statistical significance due to the low number of events, data suggest a new spectral hardening at about 150 TeV.

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High-Energy Astrophysics

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