Self-consistent approach to deformation of intruder states in neutron-deficient Pb and Po

Abstract

We present systematic calculations of the properties of 11− isomers in neutron-deficient 184–198Pb and 188–200Po. These states are based on the π(h9/2i13/2)Kπ=11− configuration. They are calculated in the framework of the Hartree–Fock–Bogoliubov method with a Skyrme interaction and density-dependent pairing force. The energies and deformations of the 11− states are compared to those of the intruder 0+ states in both Pb and Po isotopes. In the most neutron-deficient Po isotopes, the calculations predict, below a weakly oblate 11− state, another oblate 11− state which is even more deformed than the intruder oblate 11− state in their Pb isotones. The energies and quadrupole moments of the 11− isomers, corresponding to a weakly oblate nuclear shape, are in fair agreement with the available experimental data.