Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01

AMS-01 Collaboration;Aguila, M.;Cortina Gil, Eduardo;et.al.
(2007) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 646, n° 4, p. 145-154 (2007)

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Abstract
A measurement of the cosmic ray positron fraction e+/(e++e−) in the energy range of 1–30 GeV is presented. The measurement is based on data taken by the AMS-01 experiment during its 10 day Space Shuttle flight in June 1998. A proton background suppression on the order of 106 is reached by identifying converted bremsstrahlung photons emitted from positrons.
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AMS-01 Collaboration, Aguila, M., Cortina Gil, E., & et al. (2007). Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 646(4), 145-154. https://doi.org/10.1016/j.physletb.2007.01.024 (Original work published 2007)