论文部分内容阅读
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．
The modeled structure of a 14MeV energy neutron source was modeled using the TAMAKER-ANISN program and 46 groups (neutron 25, photon 21) UW section databases on the IBMI / PCAT computer. The moderator material is polyethylene and the reinforcing material is lead. In the calculation, the influence of lead (n, 2n) reaction is introduced as a source of fission sources in the migration equation. The calculated results and experiments confirm each other. Further identify the best combination of lead and polyethylene. In principle, it can be concluded that the enhancement factor of the peak thermal neutron fluence rate of lead in polyethylene moderator can be greater than 3.0.