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Beatty, J J; Bhattacharyya, A; Bower, C; Coutu, S; Duvernois, M A; McKee, S; Minnick, S A; Müller, D; Musser, J; Nutter, S; Labrador, A W; Schubnell, M; Swordy, S; Tarlé, G; Tomasch, A
Physical review letters, 12/2004, Letnik: 93, Številka: 24Journal Article
We present a new measurement of the cosmic-ray positron fraction at energies between 5 and 15 GeV with the balloon-borne HEAT-pbar instrument in the spring of 2000. The data presented here are compatible with our previous measurements, obtained with a different instrument. The combined data from the three HEAT flights indicate a small positron flux of nonstandard origin above 5 GeV. We compare the new measurement with earlier data obtained with the HEAT-e(+/-) instrument, during the opposite epoch of the solar cycle, and conclude that our measurements do not support predictions of charge sign dependent solar modulation of the positron abundance at 5 GeV.
