Electron and Positron Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station
By M. Aguilar, D. Aisa, A. Alvino, G. Ambrosi, K. Andeen, L. Arruda, N. Attig, P. Azzarello, A. Bachlechner, F. Barão and 268 more. 2014
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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.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/2729f673328b6fc0c147ea95232aad6c5628e634
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In Nuclear and High Energy Physics
Citations in the corpus
- Cosmic-ray energy spectrum and composition up to the ankle - the case for a second Galactic component (2016, methodology): “…experiments such as ATIC-2 (Panov et al. 2007), CREAM (Yoon et al. 2011), TRACER (Obermeier et al. 2011), PAMELA (Adriani et al. 2014), AMS-02 (Aguilar et al. 2014, 2015a,b), Article published by EDP Sciences A33, page 1 of 24 and Fermi-LAT (Abdo et al. 2009) have measured the energy spectra…”
- Cosmic-ray propagation with DRAGON2: I. numerical solver and astrophysical ingredients (2016, result): “Since 2006 the PAMELA [1] orbital observatory has measured the spectra of many charged cosmic-ray (CR) species and discovered several intriguing anomalies in the proton, helium and positron spectrum [2–4]; AMS-02 [5], on board of the International Space Station since 2011, confirmed some of those re”