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Main Authors:	DAMPE Collaboration, Alemanno, F., Altomare, C., An, Q., Azzarello, P., Barbato, F. C. T., Bernardini, P., Bi, X. J., Boutin, H., Cagnoli, I., Cai, M. S., Casilli, E., Catanzani, E., Chang, J., Chen, D. Y., Chen, J. L., Chen, Z. F., Chen, Z. X., Coppin, P., Cui, M. Y., Cui, T. S., Cui, Y. X., De Mitri, I., de Palma, F., Di Giovanni, A., Dong, T. K., Dong, Z. X., Donvito, G., Droz, D., Duan, J. L., Duan, K. K., Fan, R. R., Fan, Y. Z., Fang, F., Fang, K., Feng, C. Q., Feng, L., Frieden, J. M., Fusco, P., Gao, M., Gargano, F., Ghose, E., Gong, K., Gong, Y. Z., Guo, D. Y., Guo, J. H., Han, S. X., Hu, Y. M., Huang, G. S., Huang, X. Y., Huang, Y. Y., Ionica, M., Jiang, L. Y., Jiang, Y. Z., Jiang, W., Kong, J., Kotenko, A., Kyratzis, D., Lei, S. J., Li, W. H., Li, W. L., Li, X., Li, X. Q., Liang, Y. M., Liu, C. M., Liu, H., Liu, J., Liu, S. B., Liu, Y., Loparco, F., Ma, M., Ma, P. X., Ma, T., Ma, X. Y., Marsella, G., Mazziotta, M. N., Mo, D., Niu, X. Y., Parenti, A., Peng, W. X., Peng, X. Y., Perrina, C., Putti-Garcia, E., Qiao, R., Rao, J. N., Sarkar, R., Savina, P., Serpolla, A., Shangguan, Z., Shen, W. H., Shen, Z. Q., Shen, Z. T., Silveri, L., Song, J. X., Stolpovskiy, M., Su, H., Su, M., Sun, H. R., Sun, Z. Y., Surdo, A., Teng, X. J., Tykhonov, A., Wang, J. Z., Wang, L. G., Wang, S., Wang, X. L., Wang, Y. F., Wang, Y., Wei, D. M., Wei, J. J., Wei, Y. F., Wu, D., Wu, J., Wu, S. S., Wu, X., Xia, Z. Q., Xu, E. H., Xu, H. T., Xu, J., Xu, Z. H., Xu, Z. L., Xu, Z. Z., Xue, G. F., Yang, H. B., Yang, P., Yang, Y. Q., Yao, H. J., Yu, Y. H., Yuan, Q., Yue, C., Zang, J. J., Zhang, 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., Zhao, C., Zhao, H. Y., Zhao, X. F., Zhou, C. Y., Zhu, Y.
Format:	Preprint
Published:	2024
Subjects:	High Energy Astrophysical Phenomena High Energy Physics - Experiment
Online Access:	https://arxiv.org/abs/2412.11460
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author	DAMPE Collaboration Alemanno, F. Altomare, C. An, Q. Azzarello, P. Barbato, F. C. T. Bernardini, P. Bi, X. J. Boutin, H. Cagnoli, I. Cai, M. S. Casilli, E. Catanzani, E. Chang, J. Chen, D. Y. Chen, J. L. Chen, Z. F. Chen, Z. X. Coppin, P. Cui, M. Y. Cui, T. S. Cui, Y. X. De Mitri, I. de Palma, F. Di Giovanni, A. Dong, T. K. Dong, Z. X. Donvito, G. Droz, D. Duan, J. L. Duan, K. K. Fan, R. R. Fan, Y. Z. Fang, F. Fang, K. Feng, C. Q. Feng, L. Frieden, J. M. Fusco, P. Gao, M. Gargano, F. Ghose, E. Gong, K. Gong, Y. Z. Guo, D. Y. Guo, J. H. Han, S. X. Hu, Y. M. Huang, G. S. Huang, X. Y. Huang, Y. Y. Ionica, M. Jiang, L. Y. Jiang, Y. Z. Jiang, W. Kong, J. Kotenko, A. Kyratzis, D. Lei, S. J. Li, W. H. Li, W. L. Li, X. Li, X. Q. Liang, Y. M. Liu, C. M. Liu, H. Liu, J. Liu, S. B. Liu, Y. Loparco, F. Ma, M. Ma, P. X. Ma, T. Ma, X. Y. Marsella, G. Mazziotta, M. N. Mo, D. Niu, X. Y. Parenti, A. Peng, W. X. Peng, X. Y. Perrina, C. Putti-Garcia, E. Qiao, R. Rao, J. N. Sarkar, R. Savina, P. Serpolla, A. Shangguan, Z. Shen, W. H. Shen, Z. Q. Shen, Z. T. Silveri, L. Song, J. X. Stolpovskiy, M. Su, H. Su, M. Sun, H. R. Sun, Z. Y. Surdo, A. Teng, X. J. Tykhonov, A. Wang, J. Z. Wang, L. G. Wang, S. Wang, X. L. Wang, Y. F. Wang, Y. Wei, D. M. Wei, J. J. Wei, Y. F. Wu, D. Wu, J. Wu, S. S. Wu, X. Xia, Z. Q. Xu, E. H. Xu, H. T. Xu, J. Xu, Z. H. Xu, Z. L. Xu, Z. Z. Xue, G. F. Yang, H. B. Yang, P. Yang, Y. Q. Yao, H. J. Yu, Y. H. Yuan, Q. Yue, C. Zang, J. J. Zhang, 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. Zhao, C. Zhao, H. Y. Zhao, X. F. Zhou, C. Y. Zhu, Y.
author_facet	DAMPE Collaboration Alemanno, F. Altomare, C. An, Q. Azzarello, P. Barbato, F. C. T. Bernardini, P. Bi, X. J. Boutin, H. Cagnoli, I. Cai, M. S. Casilli, E. Catanzani, E. Chang, J. Chen, D. Y. Chen, J. L. Chen, Z. F. Chen, Z. X. Coppin, P. Cui, M. Y. Cui, T. S. Cui, Y. X. De Mitri, I. de Palma, F. Di Giovanni, A. Dong, T. K. Dong, Z. X. Donvito, G. Droz, D. Duan, J. L. Duan, K. K. Fan, R. R. Fan, Y. Z. Fang, F. Fang, K. Feng, C. Q. Feng, L. Frieden, J. M. Fusco, P. Gao, M. Gargano, F. Ghose, E. Gong, K. Gong, Y. Z. Guo, D. Y. Guo, J. H. Han, S. X. Hu, Y. M. Huang, G. S. Huang, X. Y. Huang, Y. Y. Ionica, M. Jiang, L. Y. Jiang, Y. Z. Jiang, W. Kong, J. Kotenko, A. Kyratzis, D. Lei, S. J. Li, W. H. Li, W. L. Li, X. Li, X. Q. Liang, Y. M. Liu, C. M. Liu, H. Liu, J. Liu, S. B. Liu, Y. Loparco, F. Ma, M. Ma, P. X. Ma, T. Ma, X. Y. Marsella, G. Mazziotta, M. N. Mo, D. Niu, X. Y. Parenti, A. Peng, W. X. Peng, X. Y. Perrina, C. Putti-Garcia, E. Qiao, R. Rao, J. N. Sarkar, R. Savina, P. Serpolla, A. Shangguan, Z. Shen, W. H. Shen, Z. Q. Shen, Z. T. Silveri, L. Song, J. X. Stolpovskiy, M. Su, H. Su, M. Sun, H. R. Sun, Z. Y. Surdo, A. Teng, X. J. Tykhonov, A. Wang, J. Z. Wang, L. G. Wang, S. Wang, X. L. Wang, Y. F. Wang, Y. Wei, D. M. Wei, J. J. Wei, Y. F. Wu, D. Wu, J. Wu, S. S. Wu, X. Xia, Z. Q. Xu, E. H. Xu, H. T. Xu, J. Xu, Z. H. Xu, Z. L. Xu, Z. Z. Xue, G. F. Yang, H. B. Yang, P. Yang, Y. Q. Yao, H. J. Yu, Y. H. Yuan, Q. Yue, C. Zang, J. J. Zhang, 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. Zhao, C. Zhao, H. Y. Zhao, X. F. Zhou, C. Y. Zhu, Y.
contents	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.
format	Preprint
id	arxiv_https___arxiv_org_abs_2412_11460
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Observation of a spectral hardening in cosmic ray boron spectrum with the DAMPE space mission DAMPE Collaboration Alemanno, F. Altomare, C. An, Q. Azzarello, P. Barbato, F. C. T. Bernardini, P. Bi, X. J. Boutin, H. Cagnoli, I. Cai, M. S. Casilli, E. Catanzani, E. Chang, J. Chen, D. Y. Chen, J. L. Chen, Z. F. Chen, Z. X. Coppin, P. Cui, M. Y. Cui, T. S. Cui, Y. X. De Mitri, I. de Palma, F. Di Giovanni, A. Dong, T. K. Dong, Z. X. Donvito, G. Droz, D. Duan, J. L. Duan, K. K. Fan, R. R. Fan, Y. Z. Fang, F. Fang, K. Feng, C. Q. Feng, L. Frieden, J. M. Fusco, P. Gao, M. Gargano, F. Ghose, E. Gong, K. Gong, Y. Z. Guo, D. Y. Guo, J. H. Han, S. X. Hu, Y. M. Huang, G. S. Huang, X. Y. Huang, Y. Y. Ionica, M. Jiang, L. Y. Jiang, Y. Z. Jiang, W. Kong, J. Kotenko, A. Kyratzis, D. Lei, S. J. Li, W. H. Li, W. L. Li, X. Li, X. Q. Liang, Y. M. Liu, C. M. Liu, H. Liu, J. Liu, S. B. Liu, Y. Loparco, F. Ma, M. Ma, P. X. Ma, T. Ma, X. Y. Marsella, G. Mazziotta, M. N. Mo, D. Niu, X. Y. Parenti, A. Peng, W. X. Peng, X. Y. Perrina, C. Putti-Garcia, E. Qiao, R. Rao, J. N. Sarkar, R. Savina, P. Serpolla, A. Shangguan, Z. Shen, W. H. Shen, Z. Q. Shen, Z. T. Silveri, L. Song, J. X. Stolpovskiy, M. Su, H. Su, M. Sun, H. R. Sun, Z. Y. Surdo, A. Teng, X. J. Tykhonov, A. Wang, J. Z. Wang, L. G. Wang, S. Wang, X. L. Wang, Y. F. Wang, Y. Wei, D. M. Wei, J. J. Wei, Y. F. Wu, D. Wu, J. Wu, S. S. Wu, X. Xia, Z. Q. Xu, E. H. Xu, H. T. Xu, J. Xu, Z. H. Xu, Z. L. Xu, Z. Z. Xue, G. F. Yang, H. B. Yang, P. Yang, Y. Q. Yao, H. J. Yu, Y. H. Yuan, Q. Yue, C. Zang, J. J. Zhang, 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. Zhao, C. Zhao, H. Y. Zhao, X. F. Zhou, C. Y. Zhu, Y. High Energy Astrophysical Phenomena High Energy Physics - Experiment 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.
title	Observation of a spectral hardening in cosmic ray boron spectrum with the DAMPE space mission
topic	High Energy Astrophysical Phenomena High Energy Physics - Experiment
url	https://arxiv.org/abs/2412.11460

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