Journal
PHYSICS LETTERS B
Volume 646, Issue 4, Pages 145-154Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2007.01.024
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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 10(6) is reached by identifying converted bremsstrahlung photons emitted from positrons. (c) 2007 Elsevier B.V. All rights reserved.
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