Measurement of Cosmic-Ray Antiproton Spectrum at Solar Minimum with a Long-Duration Balloon Flight in Antarctica

The energy spectrum of cosmic-ray antiprotons (p(raised bar)'s) collected by the BESS-Polar II instrument during a long-duration flight over Antarctica in the solar minimum period of December 2007 through January 2008. The p(raised bar) spectrum measured by BESS-Polar II shows good consistency...

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Bibliographic Details
Main Authors: Hasegawa, M., Thakur, N., Sasaki, M., Matsukawa, Y., Ormes, J. F., Kusumoto, A., Matsuda, S., Haino, S., Horikoshi, A., Tanaka, K., Fuke, H., Seo, E. S., Abe, K., Hams, T., Streitmatter, R. E., Shinoda, R., Mitchell, J. W., Nozaki, M., Makida, Y., Kim, K. C., Orito, R., Lee, M. H., Nishimura, J., Sakai, K., Suzuki, J.
Format: Other/Unknown Material
Language:unknown
Published: 2011
Subjects:
Astronomy
Antarc*
Antarctica
Online Access:http://hdl.handle.net/2060/20110015540
Description
Summary:The energy spectrum of cosmic-ray antiprotons (p(raised bar)'s) collected by the BESS-Polar II instrument during a long-duration flight over Antarctica in the solar minimum period of December 2007 through January 2008. The p(raised bar) spectrum measured by BESS-Polar II shows good consistency with secondary p(raised bar) calculations. Cosmologically primary p(raised bar)'s have been searched for by comparing the observed and calculated p(raised bar) spectra. The BESSPolar II result shows no evidence of primary p(raised bar)'s originating from the evaporation of PBH.

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