The shell effects in the scission-point configuration of fissioning nuclei

被引：6
作者：
Ivanyuk, F. A. [1 ]
机构：
[1] Inst Nucl Res, UA-03680 Kiev, Ukraine
来源：
PHYSICA SCRIPTA | 2014年 / 89卷 / 05期
关键词：
fission process; optimal shape; scission point; deformation energy; shell effects; distribution of fission fragments; ENERGY; DEFORMATION; MASSES;
D O I：
10.1088/0031-8949/89/5/054012
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In the present work the formal definition of the scission point-the maximal elongation at which the nucleus splits into two fragments-is given. The shape and the deformation energy at the scission point are calculated using the macroscopic-microscopic model. Three minima in the scission point deformation energy are found corresponding to the 'standard', 'supershort' and 'superlong' fission modes. The contribution of each fission mode to the mass distribution of the fission fragments and total kinetic energy is discussed and compared with the experimental results. In the example of the fission of U-235 by thermal neutrons it is shown that the present approach reproduces correctly the position of the peaks of the mass distribution of the fission fragments, the value and the fine details of the total kinetic energy distribution and the magnitude of the total excitation energy of the fission fragments.
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页数：7
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