EPJ Web of Conferences (Jan 2017)

Monitoring System for the Gold Target by Radiation Detectors in Hadron Experimental Facility at J-PARC

  • Muto Ryotaro,
  • Agari Keizo,
  • Aoki Kazuya,
  • Bessho Kotaro,
  • Hagiwara Masayuki,
  • Hirose Erina,
  • Ieiri Masaharu,
  • Iwasaki Ruri,
  • Katoh Yohji,
  • Kitagawa Jun-ichi,
  • Minakawa Michifumi,
  • Morino Yuhei,
  • Saito Kiwamu,
  • Sato Yoshinori,
  • Sawada Shin’ya,
  • Shirakabe Yoshihisa,
  • Suzuki Yoshihiro,
  • Takahashi Hitoshi,
  • Tanaka Kazuhiro,
  • Toyoda Akihisa,
  • Watanabe Hiroaki,
  • Yamanoi Yutaka

DOI
https://doi.org/10.1051/epjconf/201715307004
Journal volume & issue
Vol. 153
p. 07004

Abstract

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At the Hadron Experimental Facility in J-PARC, we inject a 30-GeV proton beam into a gold target to produce secondary particle beams required for various particle and nuclear physics experiments. The gold target is placed in a hermetic chamber, and helium gas is circulated in the chamber to monitor the soundness of the target. The radioactivity in helium gas is continuously monitored by gamma-ray detectors such as a germanium detector and a NaI(Tl) detector. Beam operations with those target-monitoring systems were successfully performed from April to June and October to December 2015, and from May to June 2016. In this paper, the details of the helium gas circulation system and gamma-ray detectors and the analysis results of the obtained gamma-ray spectra are reported.