Abstract
The effect of Δ excitation on the shell-model effective NN interactions is investigated by evaluating the Δ-particle nucleon–hole core polarization diagrams within the folded-diagram formulation. The calculation has been performed using the NN ↔ NΔ transition G-matrix generated from a coupled-channel πNN model which is constrained by the NN data up to 1 GeV and is based on a Δ-subtracted Paris potential. Satisfactory convergence of the calculation is reached by including the Δ excitations up to 20 oscillator shells. The Δ-particle nucleon-hole core-polarization diagrams are found to be small for the sd-shell valence nucleons.
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