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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

L. Accardo et al. (AMS Collaboration)
Phys. Rev. Lett. 113, 121101 – Published 18 September 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.

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  • Received 18 July 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.121101

© 2014 American Physical Society

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Vol. 113, Iss. 12 — 19 September 2014

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