A new limit on the flux of cosmic antihelium

T. Saeki, K. Anraku, S. Orito, J. Ormes, M. Imori, B. Kimbell, Y. Makida, H. Matsumoto, H. Matsunaga, J. Mitchell, M. Motoki, J. Nishimura, M. Nozaki, M. Otoba, T. Sanuki, R. Streitmatter, J. Suzuki, K. Tanaka, I. Ueda, N. YajimaT. Yamagami, A. Yamamoto, T. Yoshida, K. Yoshimura

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


A very sensitive search for cosmic-ray antihelium was performed using data obtained from three scientific flights of the BESS magnetic rigidity spectrometer. We have not observed any antihelium; this places a model-independent upper limit (95% C.L.) on the antihelium flux of 6 × 10-4 m2sr-1S-1 at the top of the atmosphere in the rigidity region 1 to 16 GV, after correcting for the estimated interaction loss of antihelium in the air and in the instrument. The corresponding upper limit on the He/He flux ratio is 3.1 × 106, 30 times more stringent than the limits obtained in similar rigidity regions with magnetic spectrometers previous to BESS.

Original languageEnglish
Pages (from-to)319-324
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-4
Publication statusPublished - Mar 12 1998
Externally publishedYes


  • Antihelium
  • Antimatter
  • Cosmic-ray
  • Universe

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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