Measurement of the 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. SeoY. Shikaze, R. E. Streitmatter, J. Suzuki, Y. Takasugi, K. Takeuchi, K. Tanaka, T. Yamagami, A. Yamamoto, T. Yoshida, K. Yoshimura

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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 Letter, we report the antiproton spectrum obtained, discuss the origin of cosmic-ray antiprotons, and use antiproton data to probe the effect of charge-sign-dependent drift in the solar modulation.

Original languageEnglish
Pages (from-to)103-108
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume670
Issue number2
DOIs
Publication statusPublished - Dec 11 2008
Externally publishedYes

Keywords

  • Cosmic-ray antiproton
  • Solar modulation
  • Superconducting spectrometer

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Abe, K., Fuke, H., Haino, S., Hams, T., Itazaki, A., Kim, K. C., Kumazawa, T., Lee, M. H., Makida, Y., Matsuda, S., Matsumoto, K., Mitchell, J. W., Moiseev, A. A., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sasaki, M., ... Yoshimura, K. (2008). Measurement of the cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 670(2), 103-108. https://doi.org/10.1016/j.physletb.2008.10.053