^(252)Cf自发裂变初级产物同量异位素相对产额分布测量方法研究

Investigation of a Method for Measuring the Relative Isobaric Yield Distributions in the Spontaneous Primary Fission Products of^(252)Cf

本工作基于HPGe探测器阵列采用瞬发γ-γ符合技术研究了^(252)Cf自发裂变,通过γ-γ符合谱首次提取了质量数A=106,107,108,142,143和144裂变初级产物的同量异位素相对产额分布,与GEneral Fission(GEF)模型计算结果和JENDL-5数据库参考值进行了比较。结果显示,三者符合得很好,且同量异位素相对产额分布基本上呈现近高斯分布。这表明,当裂变瞬发γ谱数据有足够统计,同时所有裂变产物核的能级纲图已知时,实验上就可以提取出裂变产物绝大部分质量链对应的同量异位素相对产额分布。

The spontaneous fission of^(252)Cf is investigated by using theγ-γcoincidence techniques with the HPGe array to extract isobaric yield of primary fission fragments viaγ-γcoincidence spectroscopy.The deduced relative isobaric yield distributions of^(252)Cf primary fission products with mass numbers of 106,107,108,142,143 and 144 are compared with the GEneral Fission(GEF)model calculations as well as the JENDL-5 values.The relative isobaric yield distributions obtained from the present experiment,JENDL-5 values and GEF model calculations are in reasonable agreement with each other and exhibit near-Gaussian characteristics.This indicates that the relative isobaric yield distributions for most mass chains of the fission products could be extracted in this way if the experimental data statistics are sufficient and the needed level schemes of the fission products are obtained.