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

*Corresponding author for this work

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 - 2002 Aug 21
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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