252Cf源驱动噪声分析法测量α初步研究

摘要

在一球形浓缩铀临界装置上,采用252 Cf源驱动噪声分析方法对其次缓发临界状态下的α进行测量,在频域内分析数据得到α.对比频域内的两种数据处理方式(功率谱实虚部相除方法和功率谱取模直接拟合方法),用互功率谱密度函数实虚部相除方法得到在-0.1$情况下,脉冲堆的a为0.58 μs-1,与Rossi-α方法的结果相吻合.%Measurements for prompt neutron decay constant a were conducted with a highly enriched uranium spherical shell using 252Cf source driven noise analysis method, which could interpret data in the frequency domain. In these measurements carried out at a slightly subcritical state, two methods of interpreting data were compared. The value for a reactivity of -0. 1 $ subcritical obtained by the ratio of the real to the imaginary part of the cross power spectral density with a.resulting value 0. 58 μs-1 agrees with the Rossi-a result.