Abstract
The effect of the Δ-hole excitation in quenching the Gamow-Teller matrix element is investigated using the pion and rho-meson exchange potential. The contributions are found to be smaller than those given by the calculation using the Landau-Migdal type interaction with g' Δ = 0.6. The difference is found to be due to the choice of g' Δ . Discussions concerning the validity of the universality g' N = g' Δ and the estimate of g' Δ are given.
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