The effect of the {Delta} three-body force on effective nucleon-nucleon interactions of the nuclear shell-model
Abstract
The effect of the A three-nucleon force on the shell-model effective interaction is investigated by evaluating the A particle-nucleon hole core polarization diagrams G{sub pp{Delta}h} within the folded-diagram formulation. The calculation has been performed using the NN {yields} N{Delta} transition G-matrix generated from a coupled-channel {pi}NN model which is constrained by the NN data up to 1 GeV and is based on a {Delta}-subtracted Paris potential. Satisfactory convergence of the calculation is reached by including the {Delta} excitations up to 20 oscillator shells. The {Delta}-hole core-polarization diagrams G{sub pp{Delta}h} are found to be very small for the sd-shell valence nucleons. A paper describing our results is being prepared for publication.
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