Precision measurement of cosmic-Ray antiproton spectrum |
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Authors: | Orito Maeno Matsunaga Abe Anraku Asaoka Fujikawa Imori Ishino Makida Matsui Matsumoto Mitchell Mitsui Moiseev Motoki Nishimura Nozaki Ormes Saeki Sanuki Sasaki Seo Shikaze Sonoda Streitmatter |
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Affiliation: | University of Tokyo, Tokyo 113-0033, Japan. |
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Abstract: | The energy spectrum of cosmic-ray antiprotons ( &pmacr;'s) has been measured in the range 0.18-3.56 GeV, based on 458 &pmacr;'s collected by BESS in a recent solar-minimum period. We have detected for the first time a characteristic peak at 2 GeV of &pmacr;'s originating from cosmic-ray interactions with the interstellar gas. The peak spectrum is reproduced by theoretical calculations, implying that the propagation models are basically correct and that different cosmic-ray species undergo a universal propagation. Future BESS data with still higher statistics will allow us to study the solar modulation and the propagation in detail and to search for primary &pmacr; components. |
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