Accès ouvert déclaré
2024
preprint
Observation of a spectral hardening in cosmic ray boron spectrum with the DAMPE space mission
DAMPE Collaboration, F. Alemanno, C. Altomare, Q. An, P. Azzarello, F. C. T. Barbato, P. Bernardini, X. J. Bi, Henri Boutin, I. Cagnoli, M. S. Cai, Elisabetta Casilli, E. Catanzani, J. F. Chang, D. Y. Chen, Ji‐Long Chen, Z. F. Chen, Z. X. Chen, Paul Coppin, Maxwell Cui, T. S. Cui, Y. X. Cui, I. De Mitri, F. de Palma, A. Di Giovanni, T. K. Dong, Z. X. Dong, Giacinto Donvito, David Droz, J. L. Duan, K. K. Duan, R. R. Fan, Y. Z. Fan, F. Fang, Ke Fang, C. Q. Feng, L. Feng, J. M. Frieden, P. Fusco, Min Gao, F. Gargano, Essna Ghose, Ke Gong, Y. Z. Gong, D. Y. Guo, J. H. Guo, Shuo Han, Yi-Ming Hu, G. S. Huang, X. Y. Huang, Y. Y. Huang, M. Ionica, Leijie Jiang, Yue Jiang, Wen Jiang, Jie Kong, Andrii Kotenko, Dimitrios Kyratzis, S. J. Lei, W. H. Li, Wenwen Li, Xiaonan Li, Xuejing Li, Y. M. Liang, C. M. Liu, Haidong Liu, Jianglai Liu, S. B. Liu, Ye Liu, F. Loparco, Mingyang Ma, Peng-Xiong Ma, T. Ma, X. Y. Ma, G. Marsella, M. N. Mazziotta, D. Mo, X. Y. Niu, A. Parenti, Weiyu Peng, Peng Xu, C. Perrina, Enzo Putti-Garcia, Rui Qiao, J. N. Rao, R. Sarkar, P. Savina, Andrea Serpolla, Z. Shangguan, W. H. Shen, Ziyue Shen, Leandro Silveri, J. X. Song, M. Stolpovskiy, Hong Su, Meng Su, Haoliang Sun, Z. Y. Sun, A. Surdo, X. J. Teng, A. Tykhonov, J. Z. Wang, L. G. Wang, R. Wang, X. L. Wang, Y. F. Wang, Y. Wang, D. M. Wei, J. J. Wei, Y. F. Wei, Di Wu, J. Wu, S. S. Wu, Xiangping Wu, Z. Q. Xia, E. H. Xu, H. T. Xu, Jilei Xu, Z. H. Xu, Z. L. Xu, Z. Z. Xu, G. F. Xue, H. B. Yang, Peng Yang, Y. Q. Yang, H. J. Yao, Yongxiong Yu, Q. Yuan, Chuan Yue, Jianxiang Zang, Xiaofeng Zhang, W. Z. Zhang, Yan Zhang, Y. Zhang, Y. J. Zhang, Y. L. Zhang, Y. P. Zhang, Y. Q. Zhang, Z. Zhang, Z. Y. Zhang, Cong Zhao, Haiyan Zhao, X. F. Zhao, C. Y. Zhou, Yuxuan Zhu
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Le résumé fourni par la source
Secondary cosmic ray fluxes are important probes of the propagation and interaction of high-energy particles in the Galaxy. Recent measurements of primary and secondary cosmic ray nuclei have revealed unexpected spectral features that demand a deeper understanding. In this work we report the direct measurement of the cosmic ray boron spectrum from 10 GeV/n to 8 TeV/n with eight years of data collected by the Dark Matter Particle Explorer (DAMPE) mission. The measured spectrum shows an evident hardening at $182\pm24$ GeV/n with a spectral power index of $γ_1 = 3.02 \pm 0.01$ before the break and an index change of $Δγ= 0.31 \pm 0.05$ after the break. A simple power law model is disfavored at a confidence level of 8$σ$. Compared with the hardenings measured in the DAMPE proton and helium spectra, the secondary boron spectrum hardens roughly twice as much as these primaries, which is consistent with a propagation related mechanism to interpret the spectral hardenings of cosmic rays observed at hundreds of GeV/n.
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Les sujets associés
Dark Matter and Cosmic PhenomenaParticle Detector Development and PerformanceAstrophysics and Cosmic Phenomena