Be(d,n)反应中子源能谱测量及应用

摘要

The neutron energy spectra of Be(d, n) reaction source for deuteron energy of 20 MeV at an angle of 0°was measured using time-of-flight techniques and the n-γ discrimination properties of a BC501A liquid scintillation detector. The energy range of the whole neutron spectra measured in the experiment was 0.7 MeV to 25.0 MeV. The fluence of neutron beam was determined by a stilbene scintillation detector which was normalized to the well-calibrated BC501A liquid scintillation detector.Based on the Be(d, n) reaction neutron source, the neutron response of a thin plastic scintillation detector in the energy range of 0.75 MeV to 15.75 MeV was measured by single particle method. The results obtained from the experiment agree with Monte Carlo simulations considering the relative uncertainty of 8 ％.%利用中子飞行时间技术和BC501A液体闪烁探测器的粒子分辨特性,测量了0°方向、20 MeV氘束轰击厚金属铍靶反应产生的中子源能谱,测量的中子能谱范围为0.7～25.0 MeV.在60°方向放置芪晶体闪烁探测器,由刻度好的BC501A液体闪烁探测器归一校正后,用于中子源强度监测.利用Be(d,n)反应中子源,采用单粒子灵敏度标定方法,实验标定了0.75～15.75 MeV能量范围内的薄膜闪烁探测器中子能量响应曲线,实验结果与蒙特卡罗模拟计算结果在8%的不确定度范围内一致.