Measurement of cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight
arXiv:0805.1754 · doi:10.1016/j.physletb.2008.10.053
Abstract
The BESS-Polar spectrometer had its first successful balloon flight over Antarctica in December 2004. During the 8.5-day long-duration flight, almost 0.9 billion events were recorded and 1,520 antiprotons were detected in the energy range 0.1-4.2 GeV. In this paper, we report the antiproton spectrum obtained, discuss the origin of cosmic-ray antiprotons, and use antiprotons to probe the effect of charge sign dependent drift in the solar modulation.
arXiv comment18 pages, 1 table, 5 figures, submitted to Physics Letters B
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