Precision measurement of cosmic-ray antiproton spectrum

S. Orito, T. Maeno, H. Matsunaga, K. Abe, K. Anraku, Y. Asaoka, M. Fujikawa, M. Imori, M. Ishino, Y. Makida, N. Matsui, H. Matsumoto, J. Mitchell, T. Mitsui, A. Moiseev, M. Motoki, J. Nishimura, M. Nozaki, J. Ormes, T. SaekiT. Sanuki, M. Sasaki, E. S. Seo, Y. Shikaze, T. Sonoda, R. Streitmatter, J. Suzuki, K. Tanaka, I. Ueda, N. Yajima, T. Yamagami, A. Yamamoto, T. Yoshida, K. Yoshimura

Research output: Contribution to journalArticlepeer-review

266 Citations (Scopus)


The energy spectrum of cosmic-ray antiprotons (p¯′s) has been measured in the range 0.18−3.56 GeV, based on 458 (p¯′s) collected by BESS in a recent solar-minimum period. We have detected for the first time a characteristic peak at 2 GeV of (p¯′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 p¯ components.

Original languageEnglish
Pages (from-to)1078-1081
Number of pages4
JournalPhysical Review Letters
Issue number6
Publication statusPublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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