Abstract
We have studied the behavior of the effective interaction in the (sd)-shell through third order for mass-18 with the meson-theoretical Paris potential. All JT states are considered. The results are compared with those obtained with the G -matrix of Kuo and Brown, based on the phenomenological Hamada-Johnston potential. The excitation spectra obtained with both these potentials are rather similar, though the Paris potential gives a better fit through third order, whereas it produces more binding for low-lying states through second order. Still, evidence for non-convergent behavior is found in T =0 states for the Paris potential.
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