γ全吸收型探测装置探测效率的实验与模拟

为精确测量keV能区中子俘获反应截面，中国原子能科学研究院核数据重点实验室基于中国散裂中子源反角白光中子源建成了国内首套γ全吸收型BaF₂探测装置。为获得重要的实验参数装置对γ射线的探测效率曲线，对单个BaF₂探测器模块能谱的测量数据与模拟结果进行比较。结果表明，测量¹³⁷Cs和⁶⁰Co源得到的实验结果与MCNP和GEANT4的模拟结果吻合较好，验证了模拟计算得到的探测效率曲线的可靠性，可用于中子俘获反应截面的在线测量。

Experiment and Simulation of Detection Efficiency of Gamma-ray Total Absorption Facility

The data of neutron capture reaction cross section are very important basic data in the research fields of advanced nuclear energy development and nuclear astrophysics. In order to accurately measure the cross section of neutron capture reaction in keV energy region and fill the gap of domestic experimental data. Key laboratory of nuclear data at China Academy of Atomic Energy has built the first gamma-ray total absorption BaF₂ facility in China based on back-streaming white neutron source at China spallation neutron source. The detection efficiency curve of gamma-ray is an important experimental parameter. Using the combination of experiment and simulation, the experimental results obtained by measuring ¹³⁷Cs and ⁶⁰Co sources are in good agreement with the simulation results of MCNP and GEANT4, which verifies the reliability of detection efficiency curve calculated by simulation. It will be used in the on-line measurement experiment of neutron capture reaction cross section.