Abstract
The structure of the unitary-model-operator approach (UMOA) is discussed in the framework of general effective interaction theory. The properties of the two-body effective interaction v ̃ 12 , introduced as a basic element in UMOA, are clarified. The effective interaction v ̃ 12 has some desirable features to be E-independent, Hermitian and decoupled between two spaces of two-particle states consisting of occupied and unoccupied orbits. It is noted that these properties of v ̃ 12 are advantageous over the usual Brueckner approach. The theory is applied to the calculation of the ground-state properties in 16O with various nucleon-nucleon potentials including the Bonn potential. The result is reasonable in comparison with those obtained in the usual Brueckner-Hartree-Fock calculation. The use of the Bonn potential with rather weaker tensor component leads to a better result. It is shown that the results for the saturation property, the binding energy versus charge radius, lie beyond the Coester band and get near to the experimental value.
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