Effect of tensor interaction on deformation and shell structure of medium-heavy and superheavy nuclei

The effect of tensor interaction is studied on deformation and shell structure of various nuclei within the deformed Skyrme Hartree-Fock+BCS model. We discuss first the effect of tensor interaction on the deformations of Kr isotopes and ⁸⁰Zr. Second, the same model is applied to investigate the role of tensor correlations on the evolution of shell structure in superheavy nuclei. To this end, we adopt four different Skyrme interactions: SLy5 without tensor interaction, and SLy5+T, T24 and T44 with tensor interaction. It is shown that the SLy5+T interaction gives the shape changes of the lowest configurations of Kr isotopes similar to experimental observations. The importance of the tensor correlations is also pointed out for the single-particle spectra of protons and neutrons in ²⁴⁹Bk and ²⁵¹Cf, respectively. The large shell gaps of superheavy nuclei are found at Z = 114 and Z = 120 for protons and N = 184 for neutrons with the spherical shape irrespective of the tensor correlations. It is also shown that Z = 114 and N = 164 shell gaps are more pronounced by the tensor correlations of SLy5+T interaction. The effect of time-odd components of Skyrme energy density functionals is examined on the deformation and the stability of superheavy elements.