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

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arxiv 0805.1754 v2 pith:VQDCTLND submitted 2008-05-12 astro-ph

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

K. Abe , H. Fuke , S. Haino , T. Hams , A. Itazaki , K. C. Kim , T. Kumazawa , M. H. Lee
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Y. Makida S. Matsuda K. Matsumoto J. W. Mitchell A. A. Moiseev Z. Myers J. Nishimura M. Nozaki R. Orito J. F. Ormes M. Sasaki E. S. Seo Y. Shikaze R. E. Streitmatter J. Suzuki Y. Takasugi K. Takeuchi K. Tanaka T. Yamagami A. Yamamoto T. Yoshida K. Yoshimura
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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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