KU, Kyoto

Static and dynamic non-axial octupole deformations suggested by Skyrme-HFB and selfconsistent RPA calculations

On the basis of the symmetry-unrestricted, cranked Skyrme-Hartree-Fock (SHF) calculations, we discuss superdeformed (SD) rotational bands in (1) N=Z nuclei, 32S, 36Ar, 40Ca, 44Ti, 48Cr, and (2) neutron-rich Sulfur isotopes from 34S to 50S close to the neutron-drip line. The calculation has been carried out with the use of the three-dimensional (3D) coordinate-mesh representation without imposing any symmetry restriction. Stability of the SD bands against exotic deformations breaking both reflection and axial symmetries are carefully examined. The analysis indicates possible appearance of negative-parity rotational bands associated with octupole shape vibrational excitations built on the SD yrast band. We shall then present results of selfconsistent RPA calculation for such a new type of collective vibrational modes. The selfconsistent RPA calculations based on the SD local minima obtained by the SHF calculation are carried out by means of the 3D mesh representation in a box.