Measurement of the cosmic-ray antiproton spectrum at solar minimum with a long-duration balloon flight over Antarctica

K. Abe, H. Fuke, S. Haino, T. Hams, M. Hasegawa, A. Horikoshi, K. C. Kim, A. Kusumoto, M. H. Lee, Y. Makida, S. Matsuda, Y. Matsukawa, J. W. Mitchell, J. Nishimura, M. Nozaki, R. Orito, J. F. Ormes, K. Sakai, M. Sasaki, E. S. SeoR. Shinoda, R. E. Streitmatter, J. Suzuki, K. Tanaka, N. Thakur, T. Yamagami, A. Yamamoto, T. Yoshida, K. Yoshimura

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Abstract

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

Original languageEnglish
Article number051102
JournalPhysical Review Letters
Volume108
Issue number5
DOIs
Publication statusPublished - Jan 31 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    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., Orito, R., Ormes, J. F., Sakai, K., Sasaki, M., ... Yoshimura, K. (2012). Measurement of the cosmic-ray antiproton spectrum at solar minimum with a long-duration balloon flight over Antarctica. Physical Review Letters, 108(5), [051102]. https://doi.org/10.1103/PhysRevLett.108.051102