Electron and Positron Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station
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Author(s)
Becker, Ulrich J.
Behlmann, Matthew Daniel
Burger, Joseph D.
Cai, Xudong
Capell, Michael H.
Chen, Andrew I.
Choumilov, Evgueni
Choutko, Vitali
Eline, Alexandre
Eppling, Frederic J.
Date Issued
September 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aguilar, M., D. Aisa, A. Alvino, G. Ambrosi, K. Andeen, L. Arruda, N. Attig, et al. “Electron and Positron Fluxes in Primary Cosmic Rays Measured 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
Precision measurements by the Alpha Magnetic Spectrometer on the International Space Station of the primary cosmic-ray electron flux in the range 0.5 to 700 GeV and the positron flux in the range 0.5 to 500 GeV are presented. The electron flux and the positron flux each require a description beyond a single power-law spectrum. Both the electron flux and the positron flux change their behavior at ∼30 GeV but the fluxes are significantly different in their magnitude and energy dependence. Between 20 and 200 GeV the positron spectral index is significantly harder than the electron spectral index. The determination of the differing behavior of the spectral indices versus energy is a new observation and provides important information on the origins of cosmic-ray electrons and positrons.
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.113.121102
