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 - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2014

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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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.
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Dates and versions

in2p3-01066019 , version 1 (03-06-2021)

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Attribution - CC BY 4.0

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L. Accardo, M. Aguilar, D. Aisa, B. Alpat, A. Alvino, 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, 2014, 113, pp.121101. ⟨10.1103/PhysRevLett.113.121101⟩. ⟨in2p3-01066019⟩
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