期刊
PHYSICAL REVIEW LETTERS
卷 122, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.041102
关键词
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资金
- DOE [DE-AC02-05CH11231]
- Sao Paulo Research Foundation (FAPESP), Brazil [2014/19149-7]
- CAS, China
- NSFC, China
- MOST, China
- provincial government of Shandong, China
- provincial government of Jiangsu, China
- provincial government of Guangdong, China
- China Scholarship Council, China
- CNRS/IN2P3, France
- CNES, France
- Enigmass, France
- ANR, France
- Pascale Ehrenfreund, Germany
- DLR, Germany [50OO1403]
- JARA-HPC, Germany [JARA0052]
- INFN under ASI-INFN Agreements, Italy [2013-002-R.0, 2014-037-R.0]
- ASI under ASI-INFN Agreements, Italy [2013-002-R.0, 2014-037-R.0]
- Consejo Nacional de Ciencia y Tecnologia, Mexico
- UNAM, Mexico
- FCT, Portugal [PTDC/FIS/122567/2010]
- CIEMAT, Spain
- IAC, Spain
- CDTI, Spain
- SEIDI-MINECO, Spain [ESP2017-87055-C2-1-P, SEV-2015-0548, MDM-20150509, RyC-2013-14660]
- Swiss National Science Foundation (SNSF), Switzerland
- federal authority, Switzerland
- cantonal authority, Switzerland
- Academia Sinica, Taiwan
- Ministry of Science and Technology (MOST), Taiwan [103-2112-M-006-018-MY3, 105-2112-M-001-003, CDA-105-M06]
- Turkish Atomic Energy Authority, Turkey [2017TAEK(CERN)A5.H6.F2-15]
- NSF, the United States of America [14255202, 1551980]
- Wyle Laboratories, the United States of America [2014/T72497]
- NASA NESSF Grant, the United States of America [HELIO15F-0005]
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/122567/2010] Funding Source: FCT
Precision measurements of cosmic ray positrons are presented up to 1 TeV based on 1.9 million positrons collected by the Alpha Magnetic Spectrometer on the International Space Station. The positron flux exhibits complex energy dependence. Its distinctive properties are (a) a significant excess starting from 25.2 +/- 1.8 GeV compared to the lower-energy, power-law trend, (b) a sharp dropoff above 284(-64)(+91) GeV, (c) in the entire energy range the positron flux is well described by the sum of a term associated with the positrons produced in the collision of cosmic rays, which dominates at low energies, and a new source term of positrons, which dominates at high energies, and (d) a finite energy cutoff of the source term of E-s = 810(-180)(+310) GeV is established with a significance of more than 4 sigma. These experimental data on cosmic ray positrons show that, at high energies, they predominantly originate either from dark matter annihilation or from other astrophysical sources.
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