Study of Collective Motion and Effective Interaction in High Excitation and High Momentum Transfer States by Quasi-elastic Scattering

从理论上研究了准弹性区自旋-同位旋模的激发。I）结构方面：用连续RPA方法计算了等矢量自旋的纵、横响应函数，并与简单壳模型、Tamm-Dancoff近似下的核关联、环近似下的核关联以及DELTA等压线激发下的结果进行了比较。我们考虑了以前没有考虑过的以下影响。a）移除Landau-Migdal参数的普适性分析。B）用位置相关的有效质量来处理核势的非定域性。c）粒子-空穴态的扩展宽度。d）核对ρ介子质量的影响。e）用求和规则方法估计RPA以外的核关联。II）反应侧：对反应^<12>C，^<40>Ca（p，n）进行了DWIA分析。我们进行了以前从未做过的计算。a）没有普适性分析的反应计算。B）充分考虑NN-t矩阵所有项之间干扰的计算。c）对复合弹反应C（d，2 p）的Glauber分析，理论分析合理地解释了由（p，n）得到的自旋纵向响应函数和由（e，e）得到的自旋横向响应函数。然而，我们面临一个矛盾，即由（p，n）得到的横向响应大约是理论响应的两倍。

We studied excitation of the spen-isospin modes in the quasi-elastic region theoretically. We also analyzed the experimental data in collaboration with LAMPF and Copenhagen group.I) Structure side : We calculated the isovector spin longitudinal and transverse response functions by the continuum RPA.We compared the result by the simple shell model, the results with nuclear correlation in the Tamm-Dancoff approximation, in the ring approximation and those with the excitation of DELTA isobar. We took into account the following effects which have not been considered previously. a) Universality ansatz for the Landau-Migdal parameters was removed. b) Non-locality of the nuclear potential was treated by the position dependent effective mass. c) Spreading width of the particle-hole state. d) Nuclear effect on the rho meson mass. e) Estimation of the nuclear correlation beyond RPA by the sum rule method.II) Reaction side : DWIA analysis was carried out for the reactions ^<12>C,^<40>Ca (p, n). We performed the following calculations which have never been made previously. a) Reaction calculation without universality ansatz. b) Calculation which fully includes interference among all terms of NN-t matrix. c) Glauber analysis of a composite projectile reaction C (d, 2p).The theoretical analysis reasonably explained the spin-longitudinal response funcions obtained by (p, n), and the spin-transverse ones extracted by (e, e). However, we faced a contradiction that the transverse response obtained by (p, n) are about twice as large as the theoretical ones.