High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5–500&nbsp;GeV with the Alpha Magnetic Spectrometer on the International Space Station

AMS Collaboration

doi:10.1103/PhysRevLett.113.121101

Scientific article

English

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, Mercedes

; 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 entities

Faculté des sciences / Section de physique / Département de physique nucléaire et corpusculaire

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

Article (Published version)

Identifiers

PID : unige:97662
DOI : 10.1103/PhysRevLett.113.121101

Journal ISSN0031-9007

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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

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