Measurement of cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight

Details Measurement of cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight Measurement of cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight

2008-05-12

arxiv.org/abs/0805.1754v2

Phys.Lett.B670:103-108,2008

Astronomy and Astrophysics

Astrophysics

18 pages, 1 table, 5 figures, submitted to Physics Letters B

Scientific paper

10.1016/j.physletb.2008.10.053

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.

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