Progress in search for antihelium with BESS

M. Sasaki*, H. Matsumoto, M. Nozaki, T. Saeki, K. Abe, K. Anraku, Y. Asaoka, M. Fujikawa, H. Fuke, M. Imori, S. Haino, K. Izumi, T. Maeno, Y. Makida, S. Matsuda, N. Matsui, T. Matsukawa, H. Matsunaga, J. W. Mitchell, T. MitsuiA. Moiseev, M. Motoki, J. Nishimura, S. Orito, J. F. Ormes, T. Sanuki, Y. Shikaze, E. S. Seo, Y. Sonoda, R. Streitmatter, J. Suzuki, K. Tanaka, K. Tanizaki, I. Ueda, J. Z. Wang, Y. Yajima, Y. Yamagami, A. Yamamoto, Y. Yamamoto, K. Yamato, T. Yoshida, K. Yoshimura

*この研究の対応する著者

研究成果: Article査読

24 被引用数 (Scopus)

抄録

We have searched for antihelium nuclei in cosmic rays using the data obtained from balloon flights of the BESS magnetic spectrometer. The search was mainly based on track-quality selection, followed by rigidity analysis, and on the time-of-flight and dE/dx measurements by the scintillation counter hodoscope. We analysed all the data collected during 1993-2000 with a common analysis procedure. No antihelium nuclei events were found in the energy range from 1 to 14 GV. In order to determine a new upper limit, we have simulated the loss in the air and in the instrument of He (He) using the GEANT/GHEISHA code. Combined with the data collected in 1993 through 2000, a new 95 % confidence upper limit for the ratio of He/He at the top of the atmosphere of 6.8 × 10-7 has been obtained to be after correcting for the interactions in the air and in the instruments.

本文言語English
ページ(範囲)202-207
ページ数6
ジャーナルNuclear Physics B - Proceedings Supplements
113
1-3
DOI
出版ステータスPublished - 2002 12
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 核物理学および高エネルギー物理学

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