The fission fragment mass-yields are evaluated for pre-actinide and actinide isotopes using a systematic statistical scission point model. The total potential energy of the fissioning systems at the scission point is presented in approximate relations as functions of mass numbers, deformation parameters and the temperature of complementary fission fragments. The collective temperature, T _coll, and the temperature of fission fragments, T _i , are separated and the effect of collective temperature on mass yields results is investigated. The fragment temperature has been calculated with the generalized superfluid model. The sum of deformation parameters of complementary fission fragments has been obtained by fitting the calculated results with the experimental data. To investigate the transitions between symmetric and asymmetric modes mass yields for pre-actinide and heavy actinides are calculated with this model. The transition from asymmetric to symmetric fission is well reproduced using this systematic statistical scission point model. The calculated results are in good agreement with the experimental data with T _coll = 2 MeV at intermediate excitation energy and with T _coll = 1 MeV for spontaneous fission. Despite the Langevin model, in the scission point model, a constraint on the deformation parameters of fission fragments has little effect on the results of the mass yield.

使用系统的统计断点模型评估裂变碎片质量产率的前锕系元素和锕系元素同位素。裂变系统在裂变点的总势能以近似关系呈现为质量数、变形参数和互补裂变碎片温度的函数。集体温度T _coll和裂变碎片的温度T _i , 是分开的，并研究了集体温度对质量产量结果的影响。碎片温度已用广义超流体模型计算。计算结果与实验数据拟合得到互补裂变碎片变形参数的总和。为了研究对称和不对称模式之间的转变，使用该模型计算了前锕系元素和重锕系元素的质量产率。使用这种系统的统计断点模型可以很好地再现从非对称裂变到对称裂变的转变。计算结果与实验数据非常吻合，T _coll = 2 MeV 在中间激发能量和T _coll= 1 MeV 用于自发裂变。尽管有朗之万模型，但在裂变点模型中，对裂变碎片变形参数的约束对质量屈服的结果影响不大。