Progress in search for antihelium with BESS

M. Sasaki, H. Matsumoto, M. Nozaki, T. Saeki, K. Abe, K. Anraku, Yoichi 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

Research output: Contribution to journalArticle

22 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)202-207
Number of pages6
JournalNuclear Physics B - Proceedings Supplements
Publication statusPublished - 2002 Dec
Externally publishedYes


ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Sasaki, M., Matsumoto, H., Nozaki, M., Saeki, T., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Fuke, H., Imori, M., Haino, S., Izumi, K., Maeno, T., Makida, Y., Matsuda, S., Matsui, N., Matsukawa, T., Matsunaga, H., Mitchell, J. W., ... Yoshimura, K. (2002). Progress in search for antihelium with BESS. Nuclear Physics B - Proceedings Supplements, 113, 202-207.