Pseudospin-orbit Coupling Research Articles

Tensor coupling and pseudospin symmetry in nuclei

In this work we study the contribution of the isoscalar tensor coupling to the realization of pseudospin symmetry in nuclei. Using realistic values for the tensor coupling strength, we show that this coupling reduces noticeably the pseudospin splittings, especially for single-particle levels near the Fermi surface. By using an energy decomposition of the pseudospin energy splittings, we show that the changes in these splittings come by mainly through the changes induced in the lower radial wave function for the low-lying pseudospin partners, and by changes in the expectation value of the pseudospin-orbit coupling term for surface partners. This allows us to confirm the conclusion already reached in previous studies, namely that the pseudospin symmetry in nuclei is of a dynamical nature.

Shell model approach to collectivity in pseudo spin-orbit coupling

A technique is described for shell model calculations in the newly suggested k- i representation of single particle states. The technique allows microscopic calculations for the structure of medium and heavy nuclei in spaces which are truncated in an analogy with the assumptions of the interacting boson model (IBM). The present technique incorporates all the power and generality of standard shell model calculations and provides a unified approach to even-even, even-odd and odd-odd nuclei.