Cosmic ray positrons at high energies: A new measurement

S. W. Barwick, J. J. Beatty, C. R. Bower, C. Chaput, S. Coutu, G. De Nolfo, D. Ficenec, J. Knapp, D. M. Lowder, S. McKee, D. Müller, J. A. Musser, S. L. Nutter, E. Schneider, S. P. Swordy, K. K. Tang, G. Tarlé, A. D. Tomasch, E. Torbet

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)390-393
Number of pages4
JournalPhysical Review Letters
Issue number3
StatePublished - Jan 1 1995

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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