Measurement of Structure in the Cosmic-Ray Positron Fraction at GeV Energies.

Details Measurement of Structure in the Cosmic-Ray Positron Fraction at GeV Energies. Measurement of Structure in the Cosmic-Ray Positron Fraction at GeV Energies.

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprp11006d&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present the results of a new measurement of the cosmic-ray positron fraction above 4 GeV obtained with the balloon-borne HEAT-pbar instrument. The data from a flight in the spring of 2000 from Ft. Sumner, NM, independently confirm the results of earlier measurements with the HEAT-e^± instrument. In particular, we notice again some structure near 10 GeV that may suggest some small primary contribution to the positron intensity. A possible interpretation of this structure in terms of a dark matter signal will be discussed.

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