Abstract :
The recently obtained experimental result for the quenching of the GT sum rule in the reaction 90Zr(p,n)90Nb is used to extract the value of the Landau–Migdal parameter gNΔ′, taking into account also the effect of the finite range meson exchange interactions. The extracted value is compared to the one obtained in the π+ρ exchange model by explicitly taking into account the effects of antisymmetrization and short range correlations. Although the π+ρ exchange model tends to give a somewhat stronger quenching than observed experimentally, the results are consistent within the experimental error bars if the quark model value for the parameter fΔ/fπ is used.
