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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Zuccon_High statistics.pdf
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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
Date Issued
September 2014
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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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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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.113.121101
