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 journalArticle

38 Citations (Scopus)

Abstract

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
Volume422
Issue number1-4
DOIs
Publication statusPublished - Mar 12 1998

Keywords

  • Antihelium
  • Antimatter
  • Cosmic-ray
  • Universe

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Fingerprint Dive into the research topics of 'A new limit on the flux of cosmic antihelium'. Together they form a unique fingerprint.

  • Cite this

    Saeki, T., Anraku, K., Orito, S., Ormes, J., Imori, M., Kimbell, B., Makida, Y., Matsumoto, H., Matsunaga, H., Mitchell, J., Motoki, M., Nishimura, J., Nozaki, M., Otoba, M., Sanuki, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., ... Yoshimura, K. (1998). A new limit on the flux of cosmic antihelium. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 422(1-4), 319-324. https://doi.org/10.1016/S0370-2693(98)00131-2