Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Measurement of TOF of fast neutrons with 238U target

  • Li, Meng (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Guan, Yuanfan (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Lu, Chengui (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Zhang, Junwei (North China University of Water Resources and Electric Power) ;
  • Yuan, Xiaohua (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Duan, Limin (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Yang, Herun (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Hu, Rongjiang (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • He, Zhiyong (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Wei, Xianglun (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Ma, Peng (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Gan, Zaiguo (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Yang, Chunli (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Zhang, Hongbin (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Chen, Liang (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Qiu, Tianli (Institute of Modern Physics, Chinese Academy of Sciences) ;
  • Hou, Yikai (School of Nuclear Science and Technology, Lanzhou University)
  • Received : 2020.03.29
  • Accepted : 2020.12.01
  • Published : 2021.06.25
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Abstract

We developed a Dual-PPACs detector for fast neutron measurements that consists of two sets of PPAC: conventional PPAC and fission PPAC. A238U(U3O8) coating is placed in the fission PPAC's anode, which is used as the neutrons conversion layer. An experiment was performed to measure neutron time-of-flight (TOF) in which 252Cf spontaneous fission source was used. An excellent time resolution of 164ps has been observed at 6 mbar in isobutene gas. With the excellent time resolution of Dual-PPACs detector, exact neutron energy can be extracted from the timing measurement. The experimental detection efficiency was 1.9 × 10-7, consistent with the efficiency of 2.5 × 10-7 given by a Geant4 simulation. Ultimately, the results show that the Dual-PPACs detector is a suitable candidate for measuring fast neutrons in the future CiADS system.

Keywords

Acknowledgement

This work is financially supported by National Key R&D Program of China (Grant No. 2018YFE0205200), the National Natural Science Foundation of China (Grant No. U1432123, 11575268, 11875174, 11875301, 11675238).

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