摘要
在ＩＢＭＩ／ＰＣＡＴ计算机上使用ＴＡＭＡＫＥＲ—ＡＮＩＳＮ程序和４６群（中子２５群、光子２１群）ＵＷ截面数据库，对１４ＭｅＶ能量的中子源的慢化体结构进行模拟计算．其中慢化材料为聚乙烯，增强材料为铅．在计算中把铅的（ｎ，２ｎ）反应的影响作为裂变源引进迁移方程的源项中．计算的结果与实验相互印证．进一步找出铅和聚乙烯的最佳组合．在原理上得出铅在聚乙烯慢化体中峰热中子注量率的增强因子可大于３．０．
Computer simulations of the moderator structure for 14MeV neutron source have been made by using TAMAKER- ANISN Program and 46 groups (25 neutron groups and 21 Photon groups) UW cross-section data with an IBM/PC AT computer.Polythene was chosen as the moderation material and lead as the intensifying msterial. In the calculation the (n,2n) reaction of lead was acted as a fission source introduced into the source term of the transport equation. The calculation results have been justified by the experiments and the optimum structural combination ofpolythene and lead has been found. In principle, the intensifying factor for the peak thermal neutron may be larger than 3.0 when using lead as the intensifying material in polyethene moderator.
出处
《核技术》
CAS
CSCD
北大核心
1994年第7期417-423,共7页
Nuclear Techniques
基金
国家科委重点科技
关键词
中子源
慢化
增强材料
铅
聚乙烯
MeV neutron source
Moderator structure
Intensifying material
Intensifying factor
