Measurement of low-energy antiproton detection efficiency in BESS below 1 GeV
/ Authors
Y. Asaoka, K. Yoshimura, T. Yoshida, K. Abe, K. Anraku, M. Fujikawa, H. Fuke, S. Haino, K. Izumi, T. Maeno
and 17 more authors
Y. Makida, N. Matsui, H. Matsumoto, H. Matsunaga, M. Motoki, M. Nozaki, S. Orito, T. Sanuki, M. Sasaki, Y. Shikaze, T. Sonoda, J. Suzuki, K. Tanaka, Y. Toki, A. Y. U. Tokyo, Kek, Kobe Univ.
/ Abstract
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 ±5%, compared with the previous estimation of ±15% which was the dominant uncertainty for measurements of cosmic-ray antiproton flux.
Journal: Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment