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 | Dampe Collaboration |
| 刊名 | NATURE
 |
| 出版日期 | 2017 |
| 卷号 | 552期号:7683页码:63-+ |
| ISSN号 | 0028-0836 |
| DOI | 10.1038/nature24475 |
| 文献子类 | Article |
| 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. |
| 电子版国际标准刊号 | 1476-4687 |
| 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 |
| WOS记录号 | WOS:000417560500043 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/284682]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Dampe Collaboration. Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons[J]. NATURE,2017,552(7683):63-+. |
| APA | Dampe Collaboration.(2017).Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons.NATURE,552(7683),63-+. |
| MLA | Dampe Collaboration."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：高能物理研究所
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