期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.141102
关键词
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资金
- U.S. DOE
- CERN
- Deutsches Zentrum fur Luft- und Raumfahrt, DLR
- National Natural Science Foundation of China
- Italian Space Agency, ASI
- SEIDI
- CPAN
- STFC [ST/F007027/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F007027/1] Funding Source: researchfish
A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8 x 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to similar to 250 GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude. The positron fraction spectrum shows no fine structure, and the positron to electron ratio shows no observable anisotropy. Together, these features show the existence of new physical phenomena. DOI: 10.1103/PhysRevLett.110.141102
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