The measurement of the energy spectrum of cosmic ray helium nuclei from 70 GeV to 80 TeV using 4.5 years of data recorded by the Dark Matter Particle Explorer (DAMPE) is reported in this work. A hardening of the spectrum is observed at an energy of about 1.3 TeV, similar to previous observations. In addition, a spectral softening at about 34 TeV is revealed for the first time with large statistics and well controlled systematic uncertainties, with an overall significance of 4.3σ. The DAMPE spectral measurements of both cosmic protons and helium nuclei suggest a particle charge dependent softening energy, although with current uncertainties a dependence on the number of nucleons cannot be ruled out.

Measurement of the Cosmic Ray Helium Energy Spectrum from 70 GeV to 80 TeV with the DAMPE Space Mission / Alemanno, F.; An, Q.; Azzarello, P.; Barbato, F. C. T.; Bernardini, P.; Bi, X. J.; Cai, M. S.; Catanzani, E.; Chang, J.; Chen, D. Y.; Chen, J. L.; Chen, Z. F.; Cui, M. Y.; Cui, T. S.; Cui, Y. X.; Dai, H. T.; D'amone, A.; De Benedittis, A.; De Mitri, I.; De Palma, F.; Deliyergiyev, M.; Di Santo, M.; Dong, T. K.; Dong, Z. X.; Donvito, G.; Droz, D.; Duan, J. L.; Duan, K. K.; D'urso, D.; Fan, R. R.; Fan, Y. Z.; Fang, K.; Fang, F.; Feng, C. Q.; Feng, L.; Fusco, P.; Gao, M.; Gargano, F.; Gong, K.; Gong, Y. Z.; Guo, D. Y.; Guo, J. H.; Guo, X. L.; Han, S. X.; Hu, Y. M.; Huang, G. S.; Huang, X. Y.; Huang, Y. Y.; Ionica, M.; Jiang, W.; Kong, J.; Kotenko, A.; Kyratzis, D.; Lei, S. J.; Li, S.; Li, W. L.; Li, X.; Li, X. Q.; Liang, Y. M.; Liu, C. M.; Liu, H.; Liu, J.; Liu, S. B.; Liu, W. Q.; Liu, Y.; Loparco, F.; Luo, C. N.; Ma, M.; Ma, P. X.; Ma, T.; Ma, X. Y.; Marsella, G.; Mazziotta, M. N.; Mo, D.; Niu, X. Y.; Pan, X.; Parenti, A.; Peng, W. X.; Peng, X. Y.; Perrina, C.; Qiao, R.; Rao, J. N.; Ruina, A.; Salinas, M. M.; Shang, G. Z.; Shen, W. H.; Shen, Z. Q.; Shen, Z. T.; Silveri, L.; Song, J. X.; Stolpovskiy, M.; Su, H.; Su, M.; Sun, Z. Y.; Surdo, A.; Teng, X. J.; Tykhonov, A.; Wang, H.; Wang, J. Z.; Wang, L. G.; Wang, S.; Wang, X. L.; Wang, Y.; Wang, Y. F.; Wang, Y. Z.; Wang, Z. M.; Wei, D. M.; Wei, J. J.; Wei, Y. F.; Wen, S. C.; Wu, D.; Wu, J.; Wu, L. B.; Wu, S. S.; Wu, X.; Xia, Z. Q.; Xu, H. T.; 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, G. W.; Yuan, Q.; Yue, C.; Zang, J. J.; Zhang, 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.; Zhao, C.; Zhao, H. Y.; Zhao, X. F.; Zhou, C. Y.; Zhu, Y.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 126:20(2021), p. 201102. [10.1103/PhysRevLett.126.201102]

Measurement of the Cosmic Ray Helium Energy Spectrum from 70 GeV to 80 TeV with the DAMPE Space Mission

D'urso D.;
2021

Abstract

The measurement of the energy spectrum of cosmic ray helium nuclei from 70 GeV to 80 TeV using 4.5 years of data recorded by the Dark Matter Particle Explorer (DAMPE) is reported in this work. A hardening of the spectrum is observed at an energy of about 1.3 TeV, similar to previous observations. In addition, a spectral softening at about 34 TeV is revealed for the first time with large statistics and well controlled systematic uncertainties, with an overall significance of 4.3σ. The DAMPE spectral measurements of both cosmic protons and helium nuclei suggest a particle charge dependent softening energy, although with current uncertainties a dependence on the number of nucleons cannot be ruled out.
Measurement of the Cosmic Ray Helium Energy Spectrum from 70 GeV to 80 TeV with the DAMPE Space Mission / Alemanno, F.; An, Q.; Azzarello, P.; Barbato, F. C. T.; Bernardini, P.; Bi, X. J.; Cai, M. S.; Catanzani, E.; Chang, J.; Chen, D. Y.; Chen, J. L.; Chen, Z. F.; Cui, M. Y.; Cui, T. S.; Cui, Y. X.; Dai, H. T.; D'amone, A.; De Benedittis, A.; De Mitri, I.; De Palma, F.; Deliyergiyev, M.; Di Santo, M.; Dong, T. K.; Dong, Z. X.; Donvito, G.; Droz, D.; Duan, J. L.; Duan, K. K.; D'urso, D.; Fan, R. R.; Fan, Y. Z.; Fang, K.; Fang, F.; Feng, C. Q.; Feng, L.; Fusco, P.; Gao, M.; Gargano, F.; Gong, K.; Gong, Y. Z.; Guo, D. Y.; Guo, J. H.; Guo, X. L.; Han, S. X.; Hu, Y. M.; Huang, G. S.; Huang, X. Y.; Huang, Y. Y.; Ionica, M.; Jiang, W.; Kong, J.; Kotenko, A.; Kyratzis, D.; Lei, S. J.; Li, S.; Li, W. L.; Li, X.; Li, X. Q.; Liang, Y. M.; Liu, C. M.; Liu, H.; Liu, J.; Liu, S. B.; Liu, W. Q.; Liu, Y.; Loparco, F.; Luo, C. N.; Ma, M.; Ma, P. X.; Ma, T.; Ma, X. Y.; Marsella, G.; Mazziotta, M. N.; Mo, D.; Niu, X. Y.; Pan, X.; Parenti, A.; Peng, W. X.; Peng, X. Y.; Perrina, C.; Qiao, R.; Rao, J. N.; Ruina, A.; Salinas, M. M.; Shang, G. Z.; Shen, W. H.; Shen, Z. Q.; Shen, Z. T.; Silveri, L.; Song, J. X.; Stolpovskiy, M.; Su, H.; Su, M.; Sun, Z. Y.; Surdo, A.; Teng, X. J.; Tykhonov, A.; Wang, H.; Wang, J. Z.; Wang, L. G.; Wang, S.; Wang, X. L.; Wang, Y.; Wang, Y. F.; Wang, Y. Z.; Wang, Z. M.; Wei, D. M.; Wei, J. J.; Wei, Y. F.; Wen, S. C.; Wu, D.; Wu, J.; Wu, L. B.; Wu, S. S.; Wu, X.; Xia, Z. Q.; Xu, H. T.; 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, G. W.; Yuan, Q.; Yue, C.; Zang, J. J.; Zhang, 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.; Zhao, C.; Zhao, H. Y.; Zhao, X. F.; Zhou, C. Y.; Zhu, Y.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 126:20(2021), p. 201102. [10.1103/PhysRevLett.126.201102]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11388/248757
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 21
  • ???jsp.display-item.citation.isi??? 19
social impact