碳材料反射中子的^(238)U裂变反应率测量和计算

Measurement and Calculation of^(238)U Fission Reaction Rates Induced by Neutrons Reflected by Carbon Material

用小型贫化铀裂变室和俘获探测器测量了D T聚变中子在碳材料反射体上反射中子引起的238U裂变反应率分布。比较了无碳材料反射体的测量结果。实验测得的238U裂变反应率合成不确定度为5.1%～6.4%。实验结果与用MCNP/4A程序和ENDF/B Ⅳ库数据计算的结果在误差范围内符合。

To check the data of carbon material reflecting neutrons, the distribution of 238U fission reaction rates induced by D-T fusion neutrons reflected by carbon material was measured by using the small depleted uranium fission chamber and the capturing detector. For comparison, 238U fission rates without carbon material was measured too. The combined standard uncertainty of 238U fission reaction rate is 5.1%-6.4%. The measured results are consistent with the calculated ones with MCNP/4A code and ENDF/B-IV library data in the range of the error.