Systematics of nuclear ground-state properties of Sr isotopes by covariant density functional theory
Yuan Tian and Ying Cui
Accepted
The hyperfine structure and isotope shifts of Sr-isotopes, both even-even and odd-even nuclei, are studied in the covariant density functional theory (DFT) with the new parameter set DD-PC1. Pairing correlation is treated by using the Bogoliubov with a separable form of the pairing interaction. Spin-parity, charge radii, two-neutron separation energies, and pairing energies of ground states are calculated and compared with experimental data. We find a shape transition at $N\approx60$ in charge radii and spin-parity, which are consistent to each other, and generally agree with experiments. Although the nuclear masses are not very sensitive to these shape changes, odd-even mass different and pairing effect are very important to study the shape transition and shape coexistence phenomena in Sr-isotopes.