Ground-state deformations, binding energies, and potential energy surfaces have been calculated for eveneven dysprosium isotopes between 160 Dy and 180 Dy in the framework of density-dependent Hartree-Fock calculations with BCS pairing correlations. Further deformed Hartree-Fock with angular-momentum projection and band-mixing calculations explore the yrast spectra of the nuclides approaching the neutron midshell. Predictions of high-K states in the doubly midshell nucleus 66 170 Dy 104 are made.
Potentional energy surface calculations for the doubly midshell nucleus 66 170 Dy 104 support a variety of extreme properties. The ground-state deformation is among the largest in the region, consistent with it having the maximal value of valence particles for any nucleus below the 208 Pb doubly closed shell. The energy minimum is found to be remarkably constant in the ( 2 ,␥) plane as a function of angular momentum. The nucleus is predicted to undergo a dual alignment with midshell high-j protons and neutrons aligning simultaneously at spin Ϸ14ប. Configuration-constrained calculations for the two-quasiparticle configurations predict the presence of a low-lying K ϭ6 ϩ state with a similar axially symmetric shape to the highly deformed ground state.
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