MICROSCOPIC STUDY OF A C-4-SYMMETRY HYPOTHESIS IN A SIMILAR-TO 150 SUPERDEFORMED NUCLEI - DEFORMED WOODS-SAXON MEAN-FIELD

Microscopic analysis of the quantum (shell) effects related to the pre sence of the hexadecapole (Y-4 mu; mu=0,2,4) components in the nuclear mean field is performed for the superdeformed nuclei in the mass A si milar to 150 region using the deformed Woods-Saxon potential. No shell effects favoring the C-4-symmetry are found. The calculations indicat e, however, the existence of the alpha(44)-deformation driving orbital s whose occupation might induce an alpha(44)-polarization effect. For Gd-149 and Dy-153 nuclei, in which the existence of the C-4-symmetry e ffects is suspected, properties of several excited particle-hole confi guration are analyzed.