Spin-Isospin Response Functions and the Effects of the $Δ$-Hole Configurations in Finite Nuclei

Abstract

Effects of the delta-isobar $(Δ)$ mixing on the spin-isospin response functions in finite nuclei are studied in the quasi-elastic region. A method to calculate the response function for a finite system composed of nucleon $(N)$ and $Δ$ is formulated in a ring approximation. It is designed to treat the $Δ$-related Landau-Migdal parameters, $g'_{NΔ}$ and $g'_{ΔΔ}$, and the nucleon parameter $g'_{NN}$, independently, so that the universality ansatz, $g'_{NN}=g'_{NΔ}=g'_{ΔΔ}$, is removed. We calculated the isovector spin-longitudinal and -transverse response functions, $R_{L}$ and $R_{T}$, with and without the $Δ$-mixing. Inclusion of $Δ$ enhances $R_{L}$ but reduces $R_{T}$ for ordinary interactions. Dependence of $R_{L,T}$ on $g'_{NN}$ and $g'_{NΔ}$ is investigated. Decomposition into the process-decomposed response functions, $R^{[NN]}$, $R^{[NΔ]}$ and $R^{[ΔΔ]}$, is very elucidative to see the $Δ$ effects, which are found to be mainly governed by $R^{[NΔ]}$ and sensitive to $g'_{NΔ}$. The isovector spin-transverse response function $R^{(e,e')}_{T}$ obtained by $(e,e')$ is calculated by various effective interactions and compared to each other as well as experimental data.