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High statistics measurement of the positron fraction in primary cosmic rays of 0.5-500 GeV with the alpha magnetic spectrometer on the international space station.
- Source :
-
Physical review letters [Phys Rev Lett] 2014 Sep 19; Vol. 113 (12), pp. 121101. Date of Electronic Publication: 2014 Sep 18. - Publication Year :
- 2014
-
Abstract
- A precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. This measurement extends the energy range of our previous observation and increases its precision. The new results show, for the first time, that above ∼200 GeV the positron fraction no longer exhibits an increase with energy.
Details
- Language :
- English
- ISSN :
- 1079-7114
- Volume :
- 113
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Physical review letters
- Publication Type :
- Academic Journal
- Accession number :
- 25279616
- Full Text :
- https://doi.org/10.1103/PhysRevLett.113.121101