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arxiv: physics/0105003 · v2 · submitted 2001-05-01 · ⚛️ physics.ins-det

Measurement of low-energy antiproton detection efficiency in BESS below 1 GeV

Y. Asaoka (1) , K. Yoshimura (2) , T. Yoshida (2) , K. Abe (1) , K. Anraku (1) , M. Fujikawa (1) , H. Fuke (1) , S. Haino (1)
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K. Izumi (1) T. Maeno (3) Y. Makida (2) N. Matsui (1) H. Matsumoto (1) H. Matsunaga (1) M. Motoki (1) M. Nozaki (3) S. Orito (1) T. Sanuki (1) M. Sasaki (3) Y. Shikaze (1) T. Sonoda (1) J. Suzuki (2) K. Tanaka (2) Y. Toki (3) A. Yamamoto (2) ((1) The Univ. of Tokyo (2) KEK (3) Kobe Univ.)
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classification ⚛️ physics.ins-det
keywords bessantiprotondetectionefficiencysimulationderivedlow-energyaccelerator
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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 $\pm$5%, compared with the previous estimation of $\pm$15% which was the dominant uncertainty for measurements of cosmic-ray antiproton flux.

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