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大闪烁液体球测量方法具有较高的探测效率,可适用于测量多种原子核的(n,2n)反应截面。我们对该方法进行了改进。首先,将大闪烁液体球分割为N个探测单元,与液体球相比,单个探测器灵敏体积减小为原来的1/N,单位时间的计数率约减小为原来的1/N,由此可以在很大程度上减少由于γ射线符合相加效应引起的本底;其次,测量可裂变核的(n,2n)截面时,可将改进后的大闪
Large scintillation liquid sphere measurement method with high detection efficiency, suitable for measuring a variety of nuclei (n, 2n) reaction cross section. We improved this method. First, the large scintillation liquid ball is divided into N detection units. Compared with the liquid ball, the sensitive volume of a single detector is reduced to 1 / N, and the counting rate per unit time is reduced to about 1 / N from This can greatly reduce the background due to the coincidence effect of γ-rays; secondly, when measuring the (n, 2n) cross section of fissile nuclei, the improved large flash