中国物理B ›› 2023, Vol. 32 ›› Issue (10): 100703-100703.doi: 10.1088/1674-1056/acca08

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Measurement of the relative neutron sensitivity curve of a LaBr3(Ce) scintillator based on the CSNS Back-n white neutron source

Jian Liu(刘建)1, Dongming Wang(王东明)1, Yuecheng Fu(甫跃成)1, Zhongbao Li(李忠宝)1, Han Yi(易晗)2, and Longtao Yi(易龙涛)1,†   

  1. 1 Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;
    2 Spallation Neutron Source Science Center, Dongguan 523803, China
  • 收稿日期:2022-10-30 修回日期:2023-03-31 接受日期:2023-04-04 出版日期:2023-09-21 发布日期:2023-09-27
  • 通讯作者: Longtao Yi E-mail:yilt2008@163.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11905196). The authors would like to thank their colleagues from CSNS for their support.

Measurement of the relative neutron sensitivity curve of a LaBr3(Ce) scintillator based on the CSNS Back-n white neutron source

Jian Liu(刘建)1, Dongming Wang(王东明)1, Yuecheng Fu(甫跃成)1, Zhongbao Li(李忠宝)1, Han Yi(易晗)2, and Longtao Yi(易龙涛)1,†   

  1. 1 Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;
    2 Spallation Neutron Source Science Center, Dongguan 523803, China
  • Received:2022-10-30 Revised:2023-03-31 Accepted:2023-04-04 Online:2023-09-21 Published:2023-09-27
  • Contact: Longtao Yi E-mail:yilt2008@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11905196). The authors would like to thank their colleagues from CSNS for their support.

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摘要： A scintillator detector consisting of a LaBr3(Ce) (0.5%) scintillator, a photomultiplier tube (PMT), and an oscilloscope were used to study the neutron sensitivities of the LaBr3(Ce) scintillator at the China Spallation Neutron Source (CSNS) Back-n white neutron source in the double-bunch and single-bunch operation modes, respectively. Under the two operational modes, the relative neutron sensitivity curves of the LaBr3(Ce) scintillator in the energy regions of 1-20 MeV and 0.5-20 MeV were obtained for the first time. In the energy range of 1-20 MeV, the two curves were nearly identical. However the relative neutron sensitivity uncertainties of the double-bunch experiment were higher than those of the single-bunch experiment. The above results indicated that the single-bunch experiment's neutron sensitivity curve has a lower minimum measurable energy than the double-bunch experiment. Above the minimum measurable energy of the double-bunch experiment, there is little difference between the measured relative neutron sensitivity curves of the single-bunch and double-bunch experiments of the LaBr3(Ce) scintillator and those of other scintillators with a similar neutron response signal intensity.

关键词: relative neutron sensitivity, LaBr3(Ce), China Spallation Neutron Source (CSNS), white neutron source

Abstract: A scintillator detector consisting of a LaBr3(Ce) (0.5%) scintillator, a photomultiplier tube (PMT), and an oscilloscope were used to study the neutron sensitivities of the LaBr3(Ce) scintillator at the China Spallation Neutron Source (CSNS) Back-n white neutron source in the double-bunch and single-bunch operation modes, respectively. Under the two operational modes, the relative neutron sensitivity curves of the LaBr3(Ce) scintillator in the energy regions of 1-20 MeV and 0.5-20 MeV were obtained for the first time. In the energy range of 1-20 MeV, the two curves were nearly identical. However the relative neutron sensitivity uncertainties of the double-bunch experiment were higher than those of the single-bunch experiment. The above results indicated that the single-bunch experiment's neutron sensitivity curve has a lower minimum measurable energy than the double-bunch experiment. Above the minimum measurable energy of the double-bunch experiment, there is little difference between the measured relative neutron sensitivity curves of the single-bunch and double-bunch experiments of the LaBr3(Ce) scintillator and those of other scintillators with a similar neutron response signal intensity.

Key words: relative neutron sensitivity, LaBr3(Ce), China Spallation Neutron Source (CSNS), white neutron source

中图分类号:  (X- and γ-ray sources, mirrors, gratings, and detectors)

  • 07.85.Fv
29.40.Mc (Scintillation detectors) 78.70.Ps (Scintillation) 29.40.-n (Radiation detectors)