Effective interaction theory and unitary-model-operator approach to nuclear saturation problem

The structure of the effective interaction is reviewed on the similarity-transformation theory. The Hermitian effective interaction is constructed, and its formal relation with the usual non-Hermitian form is discussed. As an application of the Hermitian theory, the unitary-model-operator approach (UMOA) is formulated. The two-body effective interaction is introduced and shown to be used for a basic ingredient in describing nuclear properties. The relationship between the G-matrix theory and the present approach is discussed. The theory is applied to the calculation of the ground-state properties of 16O with various nucleon-nucleon potentials. (author) 80 refs