Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1998-03-19
Nucl.Phys. A642 (1998) 461-479
Physics
Nuclear Physics
Nuclear Theory
19 pages in LaTex, 11 Postscript figures
Scientific paper
10.1016/S0375-9474(98)00535-1
The superdeformation (SD) in non-rotating states is studied with the HF+BCS method using the Skyrme interaction. In applying the BCS theory, the seniority pairing force is employed, of which strengths are determined in order to reproduce the empirical pairing gap formula, $\bar{\Delta} = 12 A^{-1/2}$ MeV, through a smooth level density obtained in the Thomas-Fermi approximation. Properties of superdeformation are investigated by calculating potential energy surfaces (PES) for various sets of the pairing force strengths and the Skyrme force parameter for 194Hg and 236,238U. The best results are obtained using both the SkM* force and the pairing force strength determined in this paper. By making use of this set of forces, a systematic calculation of SD states is carried out extensively for even-even nuclei for 20 <= Z <= 82. From our calculation, the barriers preventing the decay into the normally deformed states are about twice as high as those predicted by Krieger et al., who used the same Skyrme interaction but a pairing force stronger than ours. The differences of the present results from the Nilsson-Strutinsky calculation are analyzed.
Onishi Naoki
Tajima Naoki
Takahara Satoshi
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