g factors as a probe for high-spin structure of neutron-rich Dy isotopes

We have made theoretical investigations on the structure of high spin states of 160-170Dy isotopes to supplement the current experimental progress being made on the production and spectroscopy of neutron-rich Dy nuclei with mass number A=166 and 168. The calculations have been carried out within the framework of cranked Hartree-Fock-Bogolyubov (CHFB) theory employing a pairing + quadrupole + hexadecapole model interaction. Our results for the g factors show a remarkable variation as a function of angular momentum while moving from 164Dy to neutron-rich isotopes 166-170Dy. This is explained in terms of relative rate of change in proton and neutron single-particle contributions to the total aligned angular momentum as the system acquires higher spins. Amongst single-particle orbitals, the πh11/2 and νi13/2 states and their respective positions from the proton and neutron Fermi levels are found to play the most crucial role. A comparison with the available experimental data shows that our calculated spin dependence of g-factor values for yrast states in the stable isotopes 160,162,164Dy are consistent with the recent measurements of Brandolini et al