Abstract

Three new rejection sampling methods for generating samples from the adjoint Klein-Nishina cross section are discussed: the two-branch rejection sampling procedure, the three-branch linear rejection sampling procedure and the three-branch inverse rejection sampling procedure. These methods have all been implemented in the Framework for REsearch in Nuclear ScIence and Engineering (FRENSIE). The efficiency and sample generation rate of each of these methods are evaluated to characterize the methods and to make recommendations regarding their use. The use of these methods in realistic transport simulations is also evaluated by incorporating a scattering function into the sampling process. The results of an infinite medium problem are presented to verify that the sampling procedure can be used in an adjoint Monte Carlo simulation to generate results that are in agreement with an equivalent forward simulation.

摘要

讨论了用于从伴随 Klein-Nishina 截面生成样本的三种新的拒绝采样方法：二分支拒绝采样程序、三分支线性拒绝采样程序和三分支逆拒绝采样程序。这些方法都已在核科学与工程研究框架 (FRENSIE) 中实施。评估每种方法的效率和样本生成率，以表征方法并就其使用提出建议。还通过将散射函数纳入采样过程来评估这些方法在实际传输模拟中的使用。