热门
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.1; An, Q.2,3; Asfandiyarov, R.4; Azzarello, P.4; Bernardini, P.5,6; Bertucci, B.1,7; Cai, M. S.8,9; Chang, J.8,9 ; Chen, D. Y.8,10; Chen, H. F.2,3
|
| 刊名 | NATURE
 |
| 出版日期 | 2017-12-07 |
| 卷号 | 552期号:7683页码:63-+ |
| ISSN号 | 0028-0836 |
| DOI | 10.1038/nature24475 |
| 通讯作者 | Ambrosi, G.() |
| 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. |
| WOS关键词 | PARTICLE DARK-MATTER ; SUPERNOVA-REMNANTS ; DAMPE ; PROPAGATION ; CANDIDATES ; SIGNATURE ; ENERGIES ; GALAXY |
| WOS研究方向 | Science & Technology - Other Topics |
| 语种 | 英语 |
| 出版者 | NATURE PUBLISHING GROUP |
| WOS记录号 | WOS:000417560500043 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/22130]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Ambrosi, G. |
| 作者单位 | 1.Ist Nazl Fis Nucl INFN, Sez Perugia, I-06123 Perugia, Italy 2.Univ Sci & Technol China, State Key Lab Particle Detect & Elect, Hefei 230026, Anhui, Peoples R China 3.Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China 4.Univ Geneva, Dept Nucl & Particle Phys, CH-1211 Geneva, Switzerland 5.Univ Salento, Dipartimento Matemat & Fis E De Giorgi, I-73100 Lecce, Italy 6.Ist Nazl Fis Nucl INFN, Sez Lecce, I-73100 Lecce, Italy 7.Univ Perugia, Dipartimento Fis & Geol, I-06123 Perugia, Italy 8.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China 9.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China 10.Univ Chinese Acad Sci, Yuquan Rd 19, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | 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-+. |
入库方式： OAI收割
来源：紫金山天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。