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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

ContributorsAMS Collaboration
CollaboratorsAzzarello, Philipp; Bourquin, Maurice; Cadoux, Franck; Haas, Daniel; Habiby Alaoui, Marion; Leluc, Catherine; Li, Yang; Paniccia, Mercedesorcid; Pohl, Martin; Rapin, Divic Jean; Saouter, Pierre
Published inPhysical Review Letters, vol. 113, no. 12
Publication date2014
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 in energy.

Keywords
  • AMS
  • Cosmic rays
  • Positron fraction
  • Dark matter
  • Magnetic spectrometer
  • Space mission
Affiliation
Citation (ISO format)
AMS Collaboration. 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. In: Physical Review Letters, 2014, vol. 113, n° 12. doi: 10.1103/PhysRevLett.113.121101
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Article (Published version)
accessLevelPublic
Identifiers
ISSN of the journal0031-9007
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130downloads

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