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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

Author(s)
Becker, Ulrich J.; Behlmann, Matthew Daniel; Burger, Joseph D.; Cai, Xudong; Capell, Michael H.; Carosi, G.; Chen, Andrew I.; Choumilov, Evgueni; Choutko, Vitali; Eline, Alexandre; Eppling, Frederic J.; Fisher, Peter H.; Galaktionov, Y.; Goglov, Pavel; Heil, Melanie; Henning, R.; Hsieh, Timothy Hwa-wei; Kounina, Olga; Kounine, Andrei; Koutsenko, Vladimir; Krafczyk, Matthew Scott; Lebedev, Alexei; Li, Q.; Plyaskin, Vasily; Rozhkov, Andrey B.; Rybka, G.; Shi, X. Y.; Sun, Wei; Sun, W. H.; Ting, Samuel C. C.; Ting, Susan Marks; Vaurynovich, Siarhei S.; Wang, Xiaozhen; Weng, Zhili; Xie, M.; Xu, Weiwei; Zhou, F.; Zuccon, Paolo; Monreal, Benjamin, 1977-; Chen, Hai, Ph. D. Massachusetts Institute of Technology; ... Show more Show less
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.

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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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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.
Date issued
2014-09
URI
http://hdl.handle.net/1721.1/90505
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Accardo, L., M. Aguilar, D. Aisa, B. Alpat, A. Alvino, G. Ambrosi, K. Andeen, et al. “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.” Physical Review Letters 113, no. 12 (September 2014). © 2014 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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