PoS - Proceedings of Science
Volume 314 - The European Physical Society Conference on High Energy Physics (EPS-HEP2017) - Astroparticle Physics (Parallel Session). Conveners: Teresa Montaruli; Simona Murgia; Pasquale Serpico. Scientific Secretary: Michele Doro.
Precision Measurement of the Positron Fraction in Primary Cosmic Rays with AMS on the Space Station
V. Vagelli*, S.B. du Pree and  On behalf of the AMS Collaboration
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Pre-published on: October 23, 2017
Published on: March 20, 2018
Abstract
The AMS-02 experiment is a large acceptance spectrometer continuously operating onboard the International Space Station since May 2011. One of the main objectives of the AMS-02 mission is the measurement of the rare antimatter components of cosmic rays. In six years of operations, AMS-02 has detected $\sim$20 million cosmic ray electrons and positrons that have been used to precisely measure the positron fraction -- the ratio of positrons over the sum of positrons and electrons -- in cosmic rays from 0.5\,GeV to 700\,GeV. The analysis of the latest data collected by AMS-02 extends the energy range of the previous measurement and improves its precision.
DOI: https://doi.org/10.22323/1.314.0026
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