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1. Measurement of the Cosmic-Ray Antiproton Spectrum at Solar Minimum with a Long-Duration Balloon Flight over Antarctica.

Author

Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Kim, K. C., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Mitchell, J. W., Nishimura, J., Nozaki, M., Onto, R., Ormes, J. F., Sakai, K., Sasaki, M., and Seo, E. S.

Subjects
*COSMIC rays, *ANTIPROTONS, *SPECTRUM analysis, *NUMERICAL calculations, *BLACK holes
Abstract

The energy spectrum of cosmic-ray antiprotons (¯p's) from 0.17 to 3.5 GeV has been measured using 7886 ¯p's detected by BESS-Polar II during a long-duration flight over Antarctica near solar minimum in December 2007 and January 2008. This shows good consistency with secondary ¯p calculations. Cosmologically primary ¯p's have been investigated by comparing measured and calculated p spectra. BESS-Polar II data show no evidence of primary ¯p's from the evaporation of primordial black holes. [ABSTRACT FROM AUTHOR]

Published
2012
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