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西南核物理化学研究所(SWINPC)铍和铅球中子倍增率实验的测量值均比理论计算值(ENDF-VI评价数据)偏低,而且随着铍、铅球的厚度增加其偏差逐渐增大。由于这两个实验的系统设计及实验测量手段基本类同,上述现象表明在这两个实验中可能存在着某些同样的问题。通过数值模拟计算分析了两项被忽略的系统误差,经修正后的实验测量值在实验误差范围内(铍;3％、铅:2.8％)与理论计算值吻合较好。
The measured values of neutron doubling rate of beryllium and lead ball in SWINPC are all lower than those of theoretical calculation (ENDF-VI), and the deviation of beryllium and lead ball is increasing with the increase of thickness of beryllium and lead ball. As the systematic design and experimental measurements of these two experiments are basically similar, the above phenomenon indicates that some of the same problems may exist in both experiments. Two neglected systematic errors were analyzed and calculated by numerical simulation. The corrected experimental values agree well with the theoretically calculated values within experimental error range (beryllium; 3%, lead: 2.8%).