Measurement of low-energy cosmic-ray antiprotons at solar minimum

H. Matsunaga, S. Orito, H. Matsumoto, K. Yoshimura, A. Moiseev, K. Anraku, R. Golden, M. Imori, Y. Makida, J. Mitchell, M. Motoki, J. Nishimura, M. Nozaki, J. Ormes, T. Saeki, T. Sanuki, R. Streitmatter, J. Suzuki, K. Tanaka, I. UedaN. Yajima, T. Yamagami, A. Yamamoto, T. Yoshida

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)


The absolute fluxes of the cosmic-ray antiprotons at solar minimum are measured in the energy range 0.18 to 1.4 GeV, based on 43 events unambiguously detected in BESS 1995 data.The resultant energy spectrum appears to be flat below 1 GeV, compatible with a possible admixture of primary antiproton component with a soft energy spectrum, while the possibility of secondary antiprotons alone explaining the data cannot be excluded with the present accuracy.Further improvement of statistical accuracy and extension of the energy range are planned in future BESS flights.

Original languageEnglish
Pages (from-to)4052-4055
Number of pages4
JournalPhysical Review Letters
Issue number19
Publication statusPublished - Sept 7 1998
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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