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
TL;DR
This paper reports the measurement of low-energy cosmic-ray antiprotons using the BESS-Polar spectrometer during its first Antarctic balloon flight, providing insights into their spectrum, origin, and solar modulation effects.
Contribution
First measurement of cosmic-ray low-energy antiproton spectrum with BESS-Polar, analyzing solar modulation and charge sign dependent drift effects.
Findings
Detected 1,520 antiprotons in 0.1-4.2 GeV range
Provided the antiproton spectrum over the energy range
Discussed implications for cosmic-ray origin and solar modulation
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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