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

AMS Collaboration, Liqiu Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

511 Citations (Scopus)

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 ∼200GeV the positron fraction no longer exhibits an increase with energy.

Original languageEnglish
Article number121101
JournalPhysical Review Letters
Volume113
Issue number12
DOIs
Publication statusPublished - 18 Sept 2014
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

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