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

Y. Asaoka, K. Yoshimura, T. Yoshida, K. Abe, K. Anraku, M. Fujikawa, H. Fuke, S. Haino, K. Izumi, T. Maeno, Y. Makida, N. Matsui, H. Matsumoto, H. Matsunaga, M. Motoki, M. Nozaki, S. Orito, T. Sanuki, M. Sasaki, Y. ShikazeT. Sonoda, J. Suzuki, K. Tanaka, Y. Toki, A. Yamamoto

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)170-177
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-3
Publication statusPublished - Aug 21 2002
Externally publishedYes


  • Antiproton detectio efficiency
  • BESS
  • Detector simulation
  • KEK PS
  • Systematic error

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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