Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.091103
Keywords
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Categories
Funding
- Sao Paulo Research Foundation (FAPESP), Brazil [2014/19149-7, 2014/50747-8, 2015-50378-5]
- CAS, China
- NSFC, China
- MOST, China
- NLAA, China
- provincial government of Shandong, China
- provincial government of Jiangsu, China
- provincial government of Guangdong, China
- China Scholarship Council, China
- Finnish Funding Agency for Innovation (Tekes), Finland [40361/01, 40518/03]
- Academy of Finland, Finland [258963]
- CNRS, France
- IN2P3, France
- CNES, France
- Enigmass, France
- ANR, France
- Pascale Ehrenfreund, Germany
- DLR, Germany
- JARA-HPC, Germany [JARA0052]
- INFN, Italy [2013-002-R.0, 2014-037-R.0]
- ASI, Italy [2013-002-R.0, 2014-037-R.0]
- CHEP Grants at Kyungpook National University, Korea [NRF-2009-0080142, NRF-2012-010226]
- CHEP Grants at Ewha Womans University, Korea [NRF-2013-004883]
- Consejo Nacional de Ciencia y Tecnologia, Mexico
- UNAM, Mexico
- FCT, Portugal [PTDC/FIS/122567/2010]
- CIEMAT, Spain
- IAC, Spain
- CDTI, Spain
- SEIDI-MINECO, Spain [AYA2012-39526-C02-(01/02), ESP2015-71662-C2-(1-P/2-P), SEV-2011-0187, SEV-2015-0548, MDM-2015-0509]
- Swiss National Science Foundation (SNSF), federal and cantonal authorities, Switzerland
- Academia Sinica, Taiwan
- Ministry of Science and Technology (MOST), Taiwan [103-2112-M-006-018-MY3, 104-2112-M-001-027, CDA-105-M06]
- Turkish Atomic Energy Authority at METU, Turkey
- NSF Grant, USA [1455202]
- Wyle Laboratories Grant, USA [2014/T72497]
- NASA NESSF Grant, USA [HELIO15F-0005]
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/122567/2010] Funding Source: FCT
- Academy of Finland (AKA) [258963, 258963] Funding Source: Academy of Finland (AKA)
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1455202] Funding Source: National Science Foundation
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A precision measurement by AMS of the antiproton flux and the antiproton-to-proton flux ratio in primary cosmic rays in the absolute rigidity range from 1 to 450 GV is presented based on 3.49 x 10(5) antiproton events and 2.42 x 10(9) proton events. The fluxes and flux ratios of charged elementary particles in cosmic rays are also presented. In the absolute rigidity range similar to 60 to similar to 500 GV, the antiproton (p) over bar, proton p, and positron e(+) fluxes are found to have nearly identical rigidity dependence and the electron e(-) flux exhibits a different rigidity dependence. Below 60 GV, the ((p) over bar /p), ((p) over bar /e(+)), and (p/e(+)) flux ratios each reaches a maximum. From similar to 60 to similar to 500 GV, the ((p) over bar /p), ((p) over bar /e(+)), and (p/e(+)) flux ratios show no rigidity dependence. These are new observations of the properties of elementary particles in the cosmos.
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