A New Limit on the Flux of Cosmic Antihelium

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...

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Detalles Bibliográficos
Autores principales: Saeki, T, Anraku, K, Orito, S, Ormes, J F, Imori, M, Kimbell, B L, Makida, Y, Matsumoto, H, Matsunaga, H, Mitchell, J, Motoki, M, Nishimura, J, Nozaki, M, Otoba, M, Sanuki, T, Streitmatter, R E, Suzuki, J, Tanaka, K, Ueda, I, Yajima, N, Yamagami, T, Yamamoto, A, Yoshida, T, Yoshimura, K
Lenguaje:eng
Publicado: 1998
Materias:
Astrophysics and Astronomy
Acceso en línea:https://dx.doi.org/10.1016/S0370-2693(98)00131-2
http://cds.cern.ch/record/336649
Descripción
Sumario: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.

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