SIMPLE APPLICATIONS OF THE PAIRING-PLUS-QUADRUPOLE-PLUS-OCTUPOLE MODEL

The octupole-octupole interaction has been added to the old pairing-pl us-quadrupole model. Symmetries of the HF mean field are discussed. An overview is presented of the ground-state deformations for a single j orbital and two opposite-parity, j, j-3 orbitals. Breaking of various symmetries can be studied within this model. It is shown that the pai ring and the quadrupole-quadrupole interaction stabilize the mean held against octupole deformation. For the single j orbital, except for on e particular j value, no non-axial quadrupole deformations were found. For two opposite-parity j, j-3 orbitals, non-axial octupole deformati ons occur in most cases. Also axial and non-axial quadrupole deformati ons were found to be induced by octupole deformations.