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Antiproton Flux, Antiproton-to-Proton Flux Ratio, and Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station

CollaborationWith : Azzarello, Philipp / Bourquin, Maurice / Cadoux, Franck / Habiby Alaoui, Marion / Leluc, Catherine / Paniccia, Mercedes / Pohl, Martin / Rapin, Divic Jean / Saouter, Pierre / Vitillo, Stefania / Willenbrock, Manfred / Wu, Xin
Published in Physical Review Letters. 2016, vol. 117, no. 9, p. 091103
Abstract A precision measurement by AMS of the antiproton flux and the antiproton-to-proton flux ratio in primary cosmic rays in the absolute rigidity range from 1 to 450 GV is presented based on 3.49×105 antiproton events and 2.42×109 proton events. The fluxes and flux ratios of charged elementary particles in cosmic rays are also presented. In the absolute rigidity range ∼60 to ∼500  GV, the antiproton ¯p, proton p, and positron e+ fluxes are found to have nearly identical rigidity dependence and the electron e− flux exhibits a different rigidity dependence. Below 60 GV, the (¯p/p), (¯p/e+), and (p/e+) flux ratios each reaches a maximum. From ∼60 to ∼500  GV, the (¯p/p), (¯p/e+), and (p/e+) flux ratios show no rigidity dependence. These are new observations of the properties of elementary particles in the cosmos.
Keywords Cosmic raysAntiprotonsDark matterAMSSpace missions
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AMS COLLABORATION. Antiproton Flux, Antiproton-to-Proton Flux Ratio, and Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station. In: Physical Review Letters, 2016, vol. 117, n° 9, p. 091103. https://archive-ouverte.unige.ch/unige:98560

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Deposited on : 2017-11-06

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