252Cf源驱动噪声分析法测量α初步研究

在一球形浓缩铀临界装置上，采用²⁵²Cf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α为0.58μs^-1，与Rossi-α方法的结果相吻合。

Preliminary Investigation of 252Cf Source Driven Noise Analysis Method for a Measurement

Measurements for prompt neutron decay constant α 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-α result.