Measurement of Cosmic-Ray Antiproton Spectrum in the Energy Range 0.18 to 3.56 GeV at Solar Minimum

Details Measurement of Cosmic-Ray Antiproton Spectrum in the Energy Range 0.18 to 3.56 GeV at Solar Minimum Measurement of Cosmic-Ray Antiproton Spectrum in the Energy Range 0.18 to 3.56 GeV at Solar Minimum

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3...81y&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

The absolute flux of cosmic-ray antiprotons has been measured at solar minimum, based on 458 antiprotons unambiguously detected by the BESS detector. In the resultant antiproton spectrum, we have detected a distinctive peak of "secondary" antiprotons (i.e., produced by the interaction of cosmic-rays with interstellar gas) for the first time, and measured its flux to 10 % accuracy. The position and the absolute flux of the peak agree with the prediction of the Standard Leaky Box model for the "secondary" antiprotons. At low energies below 1 GeV, we observe a possible excess antiproton flux over the simple Standard Leaky Box calculations. We will also present the status of the BESS'98 data, in which we have detected about 400 antiprotons.

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