Precision Measurement of Cosmic-Ray Antiproton Spectrum

S. Orito, T. Maeno, H. Matsunaga, K. Abe, K. Anraku, Yoichi 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 journalArticle

256 Citations (Scopus)

Abstract

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

Original languageEnglish
Pages (from-to)1078-1081
Number of pages4
JournalPhysical Review Letters
Volume84
Issue number6
Publication statusPublished - 2000 Feb 7
Externally publishedYes

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BESS (satellite)
antiprotons
cosmic rays
propagation
interstellar gas
energy spectra
statistics
modulation
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Orito, S., Maeno, T., Matsunaga, H., Abe, K., Anraku, K., Asaoka, Y., ... Yoshimura, K. (2000). Precision Measurement of Cosmic-Ray Antiproton Spectrum. Physical Review Letters, 84(6), 1078-1081.

Precision Measurement of Cosmic-Ray Antiproton Spectrum. / Orito, S.; Maeno, T.; Matsunaga, H.; Abe, K.; Anraku, K.; Asaoka, Yoichi; Fujikawa, M.; Imori, M.; Ishino, M.; Makida, Y.; Matsui, N.; Matsumoto, H.; Mitchell, J.; Mitsui, T.; Moiseev, A.; Motoki, M.; Nishimura, J.; Nozaki, M.; Ormes, J.; Saeki, T.; Sanuki, T.; Sasaki, M.; Seo, E. S.; Shikaze, Y.; Sonoda, T.; Streitmatter, R.; Suzuki, J.; Tanaka, K.; Ueda, I.; Yajima, N.; Yamagami, T.; Yamamoto, A.; Yoshida, T.; Yoshimura, K.

In: Physical Review Letters, Vol. 84, No. 6, 07.02.2000, p. 1078-1081.

Research output: Contribution to journalArticle

Orito, S, Maeno, T, Matsunaga, H, Abe, K, Anraku, K, Asaoka, Y, Fujikawa, M, Imori, M, Ishino, M, Makida, Y, Matsui, N, Matsumoto, H, Mitchell, J, Mitsui, T, Moiseev, A, Motoki, M, Nishimura, J, Nozaki, M, Ormes, J, Saeki, T, Sanuki, T, Sasaki, M, Seo, ES, Shikaze, Y, Sonoda, T, Streitmatter, R, Suzuki, J, Tanaka, K, Ueda, I, Yajima, N, Yamagami, T, Yamamoto, A, Yoshida, T & Yoshimura, K 2000, 'Precision Measurement of Cosmic-Ray Antiproton Spectrum', Physical Review Letters, vol. 84, no. 6, pp. 1078-1081.
Orito S, Maeno T, Matsunaga H, Abe K, Anraku K, Asaoka Y et al. Precision Measurement of Cosmic-Ray Antiproton Spectrum. Physical Review Letters. 2000 Feb 7;84(6):1078-1081.
Orito, S. ; Maeno, T. ; Matsunaga, H. ; Abe, K. ; Anraku, K. ; Asaoka, Yoichi ; Fujikawa, M. ; Imori, M. ; Ishino, M. ; Makida, Y. ; Matsui, N. ; Matsumoto, H. ; Mitchell, J. ; Mitsui, T. ; Moiseev, A. ; Motoki, M. ; Nishimura, J. ; Nozaki, M. ; Ormes, J. ; Saeki, T. ; Sanuki, T. ; Sasaki, M. ; Seo, E. S. ; Shikaze, Y. ; Sonoda, T. ; Streitmatter, R. ; Suzuki, J. ; Tanaka, K. ; Ueda, I. ; Yajima, N. ; Yamagami, T. ; Yamamoto, A. ; Yoshida, T. ; Yoshimura, K. / Precision Measurement of Cosmic-Ray Antiproton Spectrum. In: Physical Review Letters. 2000 ; Vol. 84, No. 6. pp. 1078-1081.
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AU - Orito, S.

AU - Maeno, T.

AU - Matsunaga, H.

AU - Abe, K.

AU - Anraku, K.

AU - Asaoka, Yoichi

AU - Fujikawa, M.

AU - Imori, M.

AU - Ishino, M.

AU - Makida, Y.

AU - Matsui, N.

AU - Matsumoto, H.

AU - Mitchell, J.

AU - Mitsui, T.

AU - Moiseev, A.

AU - Motoki, M.

AU - Nishimura, J.

AU - Nozaki, M.

AU - Ormes, J.

AU - Saeki, T.

AU - Sanuki, T.

AU - Sasaki, M.

AU - Seo, E. S.

AU - Shikaze, Y.

AU - Sonoda, T.

AU - Streitmatter, R.

AU - Suzuki, J.

AU - Tanaka, K.

AU - Ueda, I.

AU - Yajima, N.

AU - Yamagami, T.

AU - Yamamoto, A.

AU - Yoshida, T.

AU - Yoshimura, K.

PY - 2000/2/7

Y1 - 2000/2/7

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