Measurement of low-energy antiproton detection efficiency in BESS below <f>1 GeV</f>

Authors :: Asaoka, Y.
Yoshimura, K.
Yoshida, T.
Abe, K.
Anraku, K.
Fujikawa, M.
Fuke, H.
Haino, S.
Izumi, K.
Maeno, T.
Makida, Y.
Matsui, N.
Matsumoto, H.
Matsunaga, H.
Motoki, M.
Nozaki, M.
Orito, S.
Sanuki, T.
Sasaki, M.
Shikaze, Y.
Source :: Nuclear Instruments & Methods in Physics Research Section A. Aug2002, Vol. 489 Issue 1-3, p170. 8p.
Publication Year :: 2002
Abstract: An accelerator experiment was performed using a low-energy antiproton beam to measure antiproton detection efficiency of BESS, a balloon-borne spectrometer with a superconducting solenoid. Measured efficiencies showed good agreement with calculated ones derived from the BESS Monte Carlo simulation based on GEANT/GHEISHA. With detailed verification of the BESS simulation, the relative systematic error of detection efficiency derived from the BESS simulation has been determined to be <f>±5%</f>, compared with the previous estimation of <f>±15%</f> which was the dominant uncertainty for measurements of cosmic-ray antiproton flux. [Copyright &y& Elsevier]

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