Precise measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The BESS spectrometer has measured the energy spectrum of cosmic-ray antiprotons successively in 1993, 1995, 1997 and 1998. In total, 848 antiprotons were clearly identified in energy range 0.18 to 4.20 GeV based on magnetic-rigidity, time-of-flight, energy loss, and Cherenkov radiation measurements. The measured antiproton spectra and antiproton/proton ratios were nearly identical at the upper end of the instrumental energy range, which is consistent with theoretical calculations. In the low energy region, our data show variations that are somewhat larger than expected. This might be due to statistical fluctuation, or might suggest a contribution of primary antiprotons from novel sources.

Original languageEnglish
Pages (from-to)711-716
Number of pages6
JournalAdvances in Space Research
Volume27
Issue number4
DOIs
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

Cosmic rays
antiprotons
solar cycles
solar cycle
Rigidity
cosmic ray
Spectrometers
cosmic rays
Energy dissipation
Protons
Radiation
energy
BESS (satellite)
magnetic rigidity
radiation measurement
rigidity
energy spectra
spectrometer
energy dissipation
spectrometers

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Maeno, T., Nozaki, M., Orito, S., Matsunaga, H., Abe, K., Anraku, K., ... Yoshimura, K. (2001). Precise measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle. Advances in Space Research, 27(4), 711-716. https://doi.org/10.1016/S0273-1177(01)00129-6

Precise measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle. / Maeno, T.; Nozaki, M.; Orito, S.; Matsunaga, H.; Abe, K.; Anraku, K.; Asaoka, Yoichi; Fujikawa, M.; Imori, M.; Makida, Y.; Matsui, N.; Matsumoto, H.; Mitchell, J.; Mitsui, T.; Moiseev, A.; Motoki, M.; Nishimura, J.; Ormes, J.; Saeki, T.; Sanuki, T.; Sasaki, M.; Seo, E. S.; Shikaze, Y.; Sonoda, T.; Streitmatter, R.; Suzuki, J.; Tanaka, K.; Ueda, I.; Wang, J. Z.; Yajima, N.; Yamagami, T.; Yamamoto, A.; Yoshida, T.; Yoshimura, K.

In: Advances in Space Research, Vol. 27, No. 4, 2001, p. 711-716.

Research output: Contribution to journalArticle

Maeno, T, Nozaki, M, Orito, S, Matsunaga, H, Abe, K, Anraku, K, Asaoka, Y, Fujikawa, M, Imori, M, Makida, Y, Matsui, N, Matsumoto, H, Mitchell, J, Mitsui, T, Moiseev, A, Motoki, M, Nishimura, J, Ormes, J, Saeki, T, Sanuki, T, Sasaki, M, Seo, ES, Shikaze, Y, Sonoda, T, Streitmatter, R, Suzuki, J, Tanaka, K, Ueda, I, Wang, JZ, Yajima, N, Yamagami, T, Yamamoto, A, Yoshida, T & Yoshimura, K 2001, 'Precise measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle', Advances in Space Research, vol. 27, no. 4, pp. 711-716. https://doi.org/10.1016/S0273-1177(01)00129-6
Maeno, T. ; Nozaki, M. ; Orito, S. ; Matsunaga, H. ; Abe, K. ; Anraku, K. ; Asaoka, Yoichi ; Fujikawa, M. ; Imori, M. ; Makida, Y. ; Matsui, N. ; Matsumoto, H. ; Mitchell, J. ; Mitsui, T. ; Moiseev, A. ; Motoki, M. ; Nishimura, J. ; Ormes, J. ; Saeki, T. ; Sanuki, T. ; Sasaki, M. ; Seo, E. S. ; Shikaze, Y. ; Sonoda, T. ; Streitmatter, R. ; Suzuki, J. ; Tanaka, K. ; Ueda, I. ; Wang, J. Z. ; Yajima, N. ; Yamagami, T. ; Yamamoto, A. ; Yoshida, T. ; Yoshimura, K. / Precise measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle. In: Advances in Space Research. 2001 ; Vol. 27, No. 4. pp. 711-716.
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AU - Maeno, T.

AU - Nozaki, M.

AU - Orito, S.

AU - Matsunaga, H.

AU - Abe, K.

AU - Anraku, K.

AU - Asaoka, Yoichi

AU - Fujikawa, M.

AU - Imori, 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 - 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 - Wang, J. Z.

AU - Yajima, N.

AU - Yamagami, T.

AU - Yamamoto, A.

AU - Yoshida, T.

AU - Yoshimura, K.

PY - 2001

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