Measurement of TOF of fast neutrons with 238U target

Nuclear Engineering and Technology

Hongbin Zhang¹  Junwei Zhang²  Zhiyong He²  Yuanfan Guan²  Peng Ma²  Limin Duan²  Chunli Yang²  Tianli Qiu²  Xianglun Wei³  Yikai Hou³  Rongjiang Hu³  Liang Chen³  Chengui Lu³  Xiaohua Yuan³  Meng Li³  Zaiguo Gan³  Herun Yang⁴ 

[1] Corresponding author. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.;School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China;Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China;North China University of Water Resources and Electric Power, Zhengzhou, 450000, China;

关键词: Parallel plate avalanche counter;    The time resolution;    Neutron;    Time-of-flight(TOF);   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown