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; 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

doi:10.1016/j.physletb.2008.10.053

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arXiv · 0805.1754

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

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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.

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K. Abe, H. Fuke, S. Haino, T. Hams, A. Itazaki, K. C. Kim, T. Kumazawa, M. H. Lee, 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. 2008-09-21. Measurement of cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight. https://doi.org/10.1016/j.physletb.2008.10.053

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