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

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

2004-12-09

arxiv.org/abs/astro-ph/0412230v1

Phys.Rev.Lett.93:241102,2004

Astronomy and Astrophysics

Astrophysics

accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.93.241102

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 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.

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