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. 2012 Feb 3;108(5):051102.
doi: 10.1103/PhysRevLett.108.051102. Epub 2012 Jan 31.

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

K Abe  1 , 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 Seo, R Shinoda, R E Streitmatter, J Suzuki, K Tanaka, N Thakur, T Yamagami, A Yamamoto, T Yoshida, K Yoshimura
Affiliations

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

K Abe et al. Phys Rev Lett. .

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.

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