Research on the exotic properties of nuclei from the light to medium mass region.

The relativistic point-coupling model combined with complex momentum representation method (RMFPC-CMR method) is used to investigate the exotic phenomena in the neutron-rich Si, S, Ar, Ti, Cr, and Fe isotopes. The calculated two-neutron separation energies are compared with the relativistic Hartree–Bogoliubov calculations as well as the available experimental data. It is found that the new magic number N = 34 appears in Si and S isotopes and the traditional magic numbers N = 28 (in Si isotopes) and 50 (in Si, S, Ar, and Ti isotopes) disappear. In addition, the calculated single-particle energies and occupation probabilities of the bound and resonant states support the results and indicate that a neutron halo may occur on the neutron-rich side of Ti, Cr, and Fe isotopes. We also calculate the density distributions of neutrons and protons, and the ratios of the densities of the single-particle levels to the total neutron density. The results show that 76 - 80 Ti ( N = 54 - 58 ), 76 - 82 Cr ( N = 52 - 58 ), and 80 - 84 Fe ( N = 54 - 58 ) isotopes are possible halo nuclei, while Si, S, and Ar isotopes prefer to neutron skin. The prediction on the structure of halo and skin in the neutron-rich Si, S, Ar, Ti, Cr, and Fe isotopes are of referential value for experiment. [ABSTRACT FROM AUTHOR]