1997/10/21 by T. Saeki, K. Anraku, S. Orito +26 · 1 citation
Chemistry · Mathematics · Physics and Astronomy · #Astrophysics #Astrophysics and Cosmic Phenomena #Atmosphere (unit) #COSMIC cancer database #Chemistry #Computational physics #Cosmic ray #Dark Matter and Cosmic Phenomena #Flux (metallurgy) #Limit (mathematics) #Magnetic field #Magnetic flux #Mathematics #Meteorology #Nuclear physics #Optics #Physics #Quantum mechanics #Rigidity (electromagnetism) #Solar and Space Plasma Dynamics #Spectrometer #astro-ph
paper · pdf · doi:10.1016/s0370-2693(98)00131-2
published as Phys.Lett. B422 (1998) 319-324 · REVTeX, 4 pages (including 5 EPS figures). Submitted to PRL
arxiv created 1997/10/21 · openalex publication_date 1998/03/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A very sensitive search for cosmic-ray antihelium was performed using data obtained from three scientific flights of 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) m**(-2)sr**(-1)s**(-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 Hebar/He flux ratio is 3.1*10**(-6), 30 times more stringent than the limits obtained in similar rigidity regions with magnetic spectrometers previous to BESS.