Cosmic-ray antiproton flux in the energy range from 200 to 600 MeV

A. Moiseev, K. Yoshimura, I. Ueda, K. Anraku, R. Golden, M. Imori, S. Inaba, B. Kimbell, N. Kimura, Y. Makida, H. Matsumoto, H. Matsunaga, J. Mitchell, M. Motoki, J. Nishimura, M. Nozaki, S. Orito, J. Ormes, T. Saeki, E. S. SeoS. Stochaj, R. Streitmatter, J. Suzuki, K. Tanaka, N. Yajima, T. Yamagami, A. Yamamoto, T. Yoshida

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Abstract

We have studied the low-energy antiprotons in the cosmic rays by utilizing data obtained by the Balloon-borne Experiment with a Superconducting magnetic rigidity Spectrometer (BESS) flown in 1993 July from Lynn Lake, Manitoba, Canada. A detailed description of the event selection criteria and background corrections is given. Seven antiprotons are found that give an antiproton flux of 6.4-3.5+5.5 × 10-3(m2 sr s GeV)-1 and an antiproton/proton ratio of 5.2-2.8+4.4 × 10-6 in the 200-600 MeV energy range. These results are consistent with a secondary origin of low-energy cosmic-ray antiprotons within our uncertainties, but they still require the precise measurement of the spectrum shape below 500 MeV to clarify exactly the model of particle propagation and possible contributions from exotic sources.

Original languageEnglish
Pages (from-to)479-489
Number of pages11
JournalAstrophysical Journal
Volume474
Issue number1 PART I
DOIs
Publication statusPublished - 1997

Keywords

  • Balloons
  • Cosmic rays
  • Elementary particles

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Moiseev, A., Yoshimura, K., Ueda, I., Anraku, K., Golden, R., Imori, M., Inaba, S., Kimbell, B., Kimura, N., Makida, Y., Matsumoto, H., Matsunaga, H., Mitchell, J., Motoki, M., Nishimura, J., Nozaki, M., Orito, S., Ormes, J., Saeki, T., ... Yoshida, T. (1997). Cosmic-ray antiproton flux in the energy range from 200 to 600 MeV. Astrophysical Journal, 474(1 PART I), 479-489. https://doi.org/10.1086/303463