基于广度搜索方式的线性子链法  

A Transmutation Trajectory Analysis Method Based on Breadth-First Search

作　　者：倪王慕鸿 张竞宇[1] 于虓 王娟娟 NI Wangmuhong;ZHANG Jingyu;YU Xiao;WANG Juanjuan(School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学核科学与工程学院,北京102206

出　　处：《现代应用物理》2024年第5期140-149,共10页Modern Applied Physics

基　　金：国家磁约束核聚变能发展研究专项基金资助项目(2019YFE03110000,2019YFE03110003)。

摘　　要：传统的线性子链法采用深度搜索方式(depth-first search,DFS),但DFS包含向前寻找支链的过程,计算效率较低。针对该问题,提出了一种基于广度搜索方式(breadth-first search,BFS)的线性子链法。该方法使用了特征符号,减少了向前寻找支链的操作,并通过对特征符号的排序,能够得到完整的线性链。分别基于^(16)O和^(238)U算例测试了BFS线性子链法,计算结果表明,BFS线性子链法可以搜索到与传统线性子链法同样数量的线性链,对于^(16)O算例在不同截断链长下BFS线性子链法搜索时间均较短,对于^(238)U算例随着截断链长的增加BFS线性子链法搜索效率开始低于传统线性子链法。因此,BFS线性子链法可以达到与传统线性子链法相当的计算精度,对于活化和衰变问题,其线性链搜索效率存在显著优势。The transmutation trajectory analysis method can not only accurately calculate the number of nuclides of neutron activation products,but also give the production path of product nuclides and the contribution ratio of each path.The traditional transmutation trajectory analysis method uses depth-first search(DFS),but the DFS includes the process of searching the branch chain forward,and the computational efficiency is usually low.In this paper,a transmutation trajectory analysis method based on breadth-first search(BFS)is proposed.This method uses feature symbols,reduces the operation of looking for branch chains,and can obtain a complete linear chain by ordering the feature symbols.The proposed BFS transmutation trajectory analysis method is tested based on^(16)O and^(238)U examples,respectively.The calculation results show that the BFS transmutation trajectory analysis method can search the same number of linear chains as the traditional transmutation trajectory analysis method.For^(16)O example,the search time of the BFS transmutation trajectory analysis method is shorter under different truncated chain lengths.For^(238)U example,with the increase of truncated chain length,the search efficiency of the BFS method begins to be lower than that of the traditional method.Therefore,the BFS method can achieve the same computational accuracy as the traditional method,and its linear chain search efficiency has significant advantages for activation and decay problems.

关 键 词：活化计算 源项分析 线性子链法 深度搜索方式 广度搜索方式 

分 类 号：TL328[核科学技术—核技术及应用] O571[理学—粒子物理与原子核物理]