New Shell Structure Originated from the Combination of Quadrupole and Octupole Deformations

摘要

Semiclassical analysis of the shell structure for a reflection-asymmetricdeformed oscillator potential with irrational frequency ratio$\omega_\perp/\omega_z=\sqrt{3}$ is presented. Strong shell effects associatedwith bifurcations of short periodic orbits are found, which occur for acombination of quadrupole and octupole deformations.