Cosmic Ray Positrons at High Energies: A New Measurement

Details Cosmic Ray Positrons at High Energies: A New Measurement Cosmic Ray Positrons at High Energies: A New Measurement

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phrvl..75..390b&link_type=abstract

Physical Review Letters, Volume 75, Issue 3, July 17, 1995, pp.390-393

Physics

48

Scientific paper

We present a new measurement of the cosmic-ray positron fraction e+/\(e++e-\) obtained from the first balloon flight of the High Energy Antimatter Telescope (HEAT). Using a magnet spectrometer combined with a transition radiation detector, an electromagnetic calorimeter, and time-of-flight counters we have achieved a high degree of background rejection. Our results do not indicate a major contribution to the positron flux from primary sources. In particular, we see no evidence for the significant rise in the positron fraction at energies above ~10 GeV previously reported.

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