Delta-Hole Interaction in Nuclei and the Gamow-Teller Strength in ^90Nb

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 g_{NΔ}', 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+ρexchange model by explicitly taking into account the effects of antisymmetrization and short range correlations. Although the π+ρexchange 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 f_Δ/f_πis used.

10 pages, 1 eps figure

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