有限温度下三分裂的三种模式比较

用一个球到多个球重叠到分离的几何形状来描述裂片相互以120°方向形变(品字型),相互沿一条直线的拉长三体形变,以及先非对称后对称的级联三分裂的形变过程。方便比较只用了一个形变参数。基于液滴模型计算了表面能和库仑能,加入了新生碎片之间的核势,局域壳效应的壳能,给出三种三分裂模式的形变势能比较。考虑热核的各种温度效应,计算了在有限温度下这三种模式的位垒穿透概率,给出高温核位垒高度下降甚至位垒消失,定性给出三分裂的最可能的裂变方式。 关键词：

COMPARISON FOR THREE MODELS OF TERNARY FIS- SION AT FINITE TEMPERATURE

We define explicitly a fission path from u single sphere to partial overlapping up to separated spheres to describe three fragments with 120° (oblate), along a line (prolate), and to describe cascade with the first asysinetric fission and the second sysmetric fission. It is easy to compare the three modes for one deformation parameter. The barrieres are calculated by the temperature dependence of liquid drop model, adding the proximity potential to take into account the finite range effects of the nuclear force in a crevice, adding shell energy which is local shell effect interyra-ting all over the surface, and the fission probabilities are calculated, which lead to qualitative understanding for the best mode of ternary fission.