启明星1#装置快热分界面的中子能谱实验测量与理论计算  

Measurement and Analysis of Neutron Energy Spectrum at Fast-Thermal Neutron Interface in Venus 1#

作　　者：邓勇军[1] 权艳慧[2] 刘汉刚[1] 周祖英[2] 

机构地区：[1]中国工程物理研究院,四川绵阳621900 [2]中国原子能科学研究院,北京102413

出　　处：《原子能科学技术》2009年第4期316-321,共6页Atomic Energy Science and Technology

摘　　要：加速器驱动的快-热包层耦合次临界装置——启明星1#内的中子能谱对于验证系统设计具有重要意义。采用多箔活化法测量了启明星1#装置内快谱区与热谱区分界面上的中子能谱,利用SAND-Ⅱ及MIST程序进行解谱。同时,采用MCNP程序,通过完全真实三维模拟加速器中子源、快-热耦合包层及反射层情况,得到理论计算谱,并作为活化法解谱的初始输入谱。将实验测量结果与理论计算结果进行比较,二者一致,从而验证了理论计算的正确性。It＇s important to know the neutron energy spectrum at the interface between the fast and thermal neutron regions of the accelerator driven coupled fast/thermal spectrum device--Venus 1 #. The neutron energy spectrum was measured by the multi-foil irradiation method at the interface between the fast and thermal neutron regions. The neutron spectrum unfolding was done by using SAND-II and MIST computer code. The calculated spectrum, which was used as pre-information in the adjustment procedure, was obtained though the MCNP code. In this calculation, the neutron source, the coupled fast/thermal neutron material region as well as its surroundings were modeled in three-dimension. A comparison between the calculated and measured neutron spectra shows well agreement, which indicates the MCNP model correctly simulates the Venus 1#.

关 键 词：启明星1# 多箔活化法 中子能谱 MCNP程序 

分 类 号：O571.421[理学—粒子物理与原子核物理]