【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。更多还原

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