Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1994-10-04
Phys.Rev.C51:269-284,1995
Physics
Nuclear Physics
Nuclear Theory
26 pages (LaTeX + RevTeX), 15 figures available via Fax upon request
Scientific paper
10.1103/PhysRevC.51.269
Effects of the delta-isobar $(\Delta)$ 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 $\Delta$ is formulated in a ring approximation. It is designed to treat the $\Delta$-related Landau-Migdal parameters, $g'_{N\Delta}$ and $g'_{\Delta\Delta}$, and the nucleon parameter $g'_{NN}$, independently, so that the universality ansatz, $g'_{NN}=g'_{N\Delta}=g'_{\Delta\Delta}$, is removed. We calculated the isovector spin-longitudinal and -transverse response functions, $R_{L}$ and $R_{T}$, with and without the $\Delta$-mixing. Inclusion of $\Delta$ enhances $R_{L}$ but reduces $R_{T}$ for ordinary interactions. Dependence of $R_{L,T}$ on $g'_{NN}$ and $g'_{N\Delta}$ is investigated. Decomposition into the process-decomposed response functions, $R^{[NN]}$, $R^{[N\Delta]}$ and $R^{[\Delta\Delta]}$, is very elucidative to see the $\Delta$ effects, which are found to be mainly governed by $R^{[N\Delta]}$ and sensitive to $g'_{N\Delta}$. 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.
Ichimura Munetake
Nishida Kimiaki
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