中子发射对热中子诱发$^{235}U$ Fission碎片质量和动能分布的影响
Effects of Neutron Emission on Fragment Mass and Kinetic Energy Distribution from Thermal Neutron-Induced Fission of $^{235}U$
摘要：
用蒙特卡罗模拟研究了235 U热中子裂变核碎片的质量和动能分布。除了再现在m = 109附近的最终碎片质量数处的动能的标准偏差的显著加宽之外，我们的模拟还产生了在m = 125附近的第二加宽。这些结果与Belhafaf等人的实验数据和其他关于质量产额的结果符合得很好。我们得出结论，所获得的结果是中子发射的特性，在初级碎片动能和质量产额曲线的急剧变化的后果。我们表明，由于中子发射是危险的，使任何结论的初级数量分布的碎片从实验结果的最终数量分布。
英文摘要：
The mass and kinetic energy distribution of nuclear fragments from thermal neutron-induced fission of 235U have been studied using a Monte-Carlo simulation. Besides reproducing the pronounced broadening in the standard deviation of the kinetic energy at the final fragment mass number around m = 109, our simulation also produces a second broadening around m = 125. These results are in good agreement with the experimental data obtained by Belhafaf et al. and other results on yield of mass. We conclude that the obtained results are a consequence of the characteristics of the neutron emission, the sharp variation in the primary fragment kinetic energy and mass yield curves. We show that because neutron emission is hazardous to make any conclusion on primary quantities distribution of fragments from experimental results on final quantities distributions.
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