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

J. J. Beatty, Amit Bhattacharyya, C. Bower, S. Coutu, M. A. DuVernois, Shawn McKee, S. Minnick, D. Müller, J. Musser, S. Nutter

Type: Article

Publication Date: 2004-12-09

Citations: 210

DOI: https://doi.org/10.1103/physrevlett.93.241102

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Abstract

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.

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