Shapes of mercury nuclei and structure of lowest bands in188Hg

Abstract
The properties of neutron-deficient mercury nuclei have been investigated in a Hartree-Fock calculation with a surface delta interaction. The ground and low-lying excited states of these nuclei are seen to be of oblate shape. An angular momentum projection and band-mixing calculation for 189Hg gives two low-lying bands which agree reasonably well with experiment. State-dependent neutron effective charges are needed to obtain agreement with experimental B(E2) ratios.