<sup>238</sup>U/<sup>235</sup>U裂变截面比与俘获裂变截面比测量分析

²³⁸U/²³⁵U裂变截面比与俘获裂变截面比测量分析

摘要: 在中国实验快堆（CEFR）中直接测量²³⁸U的截面数据较困难且误差较大，但可通过测量其与²³⁵U的截面比值来获取²³⁸U的相关数据。本工作采用活化法测量²³⁸U与²³⁵U的裂变截面比及俘获裂变截面比(即σ⁸_f/σ⁵_f与σ⁸_c/σ⁵_f)，获取²³⁸U的截面数据并与MCNP计算结果进行比较。结果表明，CEFR的轴向转换区或反射层位置为最佳增殖区域。

Abstract: It was inconvenient to measure the cross section data of ²³⁸U directly and there usually exists deviations in the results. The cross section data could be obtained with good precision by the measurement of the cross section ratio between ²³⁵U and ²³⁸U, and compared with calculation result of MCNP. The results show that the optimal breed region is the axial blanket area or the reflective area.