<sup>252</sup>Cf 随机脉冲源法测量深次临界瞬发中子衰减常数

²⁵²Cf 随机脉冲源法测量深次临界瞬发中子衰减常数

摘要: 运用²⁵²Cf 随机脉冲源法时幅变换(TAC)方式测量系统,实验获得高浓缩铀椭球壳核系统的瞬发中子衰减常数α。采用单指数和双指数最小二乘法拟合，α值均为100μs^-1。用蒙特卡罗方法模拟实验过程，α计算值为110μs^-1。结果表明，该系统对深次临界α的测量是有效的。

Abstract: Experiments were performed for determing prompt neutron decay constant α of highly enriched uranium spherical shell by randomly pulsed neutron nethod with a ²⁵²Cf source. α values from both least squares analysis of single exponential and two exponential fittings are in agreement and it is 100μs^-1. α value calculated of 110μs^-1 is also obtained by Monte-Carlo method. It is proved that the time-to-amplitude converter measuring system is effective for α determination of deep subcritical assemblies.