Collective Quadrupole Excitations in Even–Even Ru Isotopes

摘要

A structure of the Woods–Saxon deformed mean-field Hamiltonian adapted to the nuclear Dirac equation is discussed. The underlying SU(2) symmetries of the Hamiltonian are reviewed together with their consequences for the behavior of the single-nucleon spectra. This brings up a strong motivation for introducing the realistic Woods–Saxon parametrisation in such a way that the position-dependent effective mass, an extra linear momentum potential and other features are directly modeled. It is demonstrated that the relatively low values of the effective mass in the nuclear interior do not cause any incorrect level-density problem close to the Fermi level. Moreover, an over-all correct spreading of the single-particle levels over a large energy scale and a very good single-particle level order can be obtained. The corresponding preliminary calculation results are illustrated.