Commissioning of the fast neutron detector array at China Institute of Atomic Energy  

作　　者：Meng-Xiao Kang Ji-Zhi Zhang Hong-Yi Wu Han-Xiong Huang Yu-Zhao Li He-Run Yang Xi-Chao Ruan 

机构地区：[1]Key Laboratory of Nuclear Data,China Institute of Atomic Energy,Beijing 102413,China [2]School of Physics and State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China [3]Institute of Modern Physics,Lanzhou 730000,China

出　　处：《Nuclear Science and Techniques》2025年第5期102-112,共11页核技术(英文)

基　　金：supported by Continuous-Support Basic Scientific Research Project(No.BJ010261223282);the National Natural Science Foundation of China(Nos.U2167201,11975318);the State Key Laboratory of Nuclear Physics and Technology;Peking University(No.NPT2023KFY01);the Research and Development Project of China National Nuclear Corporation。

摘　　要：The prompt fission neutron spectrum(PFNS)is a key nuclear data quantity that is of particular interest and plays a crucial role in understanding and modeling fission processes.An array comprising 48 liquid scintillation detectors and a parallelplate avalanche counter(PPAC)was developed at the China Institute of Atomic Energy(CIAE)to measure the PFNS of actinide nuclei.Efficiency and energy calibrations were performed for all the liquid scintillators,and their efficiencies were consistently found to be better than 5%.The time resolutions of the PPAC and liquid scintillators were measured to be 1.08 ns and 1.16 ns using~(252)Cf and~(207)Bi sources,respectively.The pulse shape discrimination of the liquid scintillator was utilized to identify neutron andγsignals on an event-by-event basis,and the figure of merit was deduced as 1.12 at a 200 ke Vee threshold.The contribution to the PFNS from multiple scattered neutrons was evaluated via Geant4 simulations,and those originating from the environment were found to be comparable to the crosstalk between the detectors.The neutron efficiency of the entire detection array was calibrated using a~(252)Cf spontaneous fission source and was demonstrated to be consistent with the Geant4 simulation results,which verified the reliability of the detection array.

关 键 词：Liquid scintillation detector Parallel Plate Avalanche Counter(PPAC) Prompt Fission Neutron Spectra(PFNS) Neutron detector array 

分 类 号：TL81[核科学技术—核技术及应用]