New Measurement of the Cosmic-Ray Positron Fraction from 5 to 15 GeV

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dc.creatorBeatty, J. J.
dc.creatorBhattacharyya, A.
dc.creatorBower, C.
dc.creatorCoutu, S.
dc.creatorDuVernois, M. A.
dc.creatorMcKee, S.
dc.creatorMinnick, S. A.
dc.creatorMuller, D.
dc.creatorMusser, J.
dc.creatorNutter, S.
dc.creatorLabrador, A. W.
dc.creatorSchubnell, M.
dc.creatorSwordy, S.
dc.creatorTarle, G.
dc.creatorTomasch, A.
dc.date2004-12-09
dc.date.accessioned2026-07-07T11:42:23Z
dc.date.available2026-07-07T11:42:23Z
dc.descriptionWe 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 non-standard 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.
dc.descriptionaccepted for publication in PRL
dc.identifierhttps://arxiv.org/abs/astro-ph/0412230
dc.identifierhttp://arxiv.org/abs/astro-ph/0412230
dc.identifierPhys.Rev.Lett.93:241102,2004
dc.identifierdoi:10.1103/PhysRevLett.93.241102
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200869
dc.subjectAstrophysics
dc.titleNew Measurement of the Cosmic-Ray Positron Fraction from 5 to 15 GeV
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