Energy difference of T=1 and T=0 J(sup pi)=0(sup (minus)) states in (sup 16)O: Effects of the tensor interaction, configuration mixing, and density-dependent Dirac spinors

摘要

It has been shown in the past that in a shell-model calculation, restricted to l(h bar)(omega) lp-lh configurations, the energy splitting between the lowest J(sup (pi))=0(sup (minus)), T=0 and J(sup (pi))=0(sup (minus)), T=1 states in (sup 16)O is mainly due to the tensor component of the nucleon-nucleon interaction. In this work, the calculation is extended to include 3(h bar)(omega) 2p-2h and 3p-3h configurations. Realistic G matrices derived from various One-Boson-Exchange potentials are used into account the effects of the Dirac-Brueckner-Hartree-Fock approach, i.e., a modification of the Dirac spinors for the nucleons in the medium. It is found that the splitting is rather sensitive to the long-range components of the isovector tensor force. The splitting is reduced considerably by including 2p-2h configurations, in particular.