中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons

文献类型:期刊论文

作者Ambrosi, G.; An, Q.; Asfandiyarov, R.; Azzarello, P.; Bernardini, P.; Bertucci, B.; Cai, M. S.; Chang, J.; Chen, D. Y.; Chen, H. F.
刊名NATURE
出版日期2017
卷号552期号:7683页码:63
DOI10.1038/nature24475
英文摘要High-energy cosmic-ray electrons and positrons (CREs), which lose energy quickly during their propagation, provide a probe of Galactic high-energy processes(1-7) and may enable the observation of phenomena such as dark-matter particle annihilation or decay(8-10). The CRE spectrum has been measured directly up to approximately 2 teraelectronvolts in previous balloon-or space-borne experiments(11-16), and indirectly up to approximately 5 teraelectronvolts using ground-based Cherenkov gamma-ray telescope arrays(17,18). Evidence for a spectral break in the teraelectronvolt energy range has been provided by indirect measurements(17,18), although the results were qualified by sizeable systematic uncertainties. Here we report a direct measurement of CREs in the energy range 25 gigaelectronvolts to 4.6 teraelectronvolts by the Dark Matter Particle Explorer (DAMPE)(19) with unprecedentedly high energy resolution and low background. The largest part of the spectrum can be well fitted by a 'smoothly broken power-law' model rather than a single power-law model. The direct detection of a spectral break at about 0.9 teraelectronvolts confirms the evidence found by previous indirect measurements(17,18), clarifies the behaviour of the CRE spectrum at energies above 1 teraelectronvolt and sheds light on the physical origin of the sub-teraelectronvolt CREs.
源URL[http://libir.pmo.ac.cn/handle/332002/17890]  
专题中国科学院紫金山天文台
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Ambrosi, G.,An, Q.,Asfandiyarov, R.,et al. Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons[J]. NATURE,2017,552(7683):63.
APA Ambrosi, G..,An, Q..,Asfandiyarov, R..,Azzarello, P..,Bernardini, P..,...&Zimmer, S..(2017).Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons.NATURE,552(7683),63.
MLA Ambrosi, G.,et al."Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons".NATURE 552.7683(2017):63.

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