Elsevier, Physics Letters B, 4(646), p. 145-154, 2007
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. ; Comment: 20 pages, Latex, 7 .eps figures