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

我们从理论上研究了准弹性区域中旋-同位旋模式的激发。我们还与LAMPF和Copenhagen小组合作分析了实验数据。1)结构侧：利用连续体RPA计算了等矢量自旋纵向和横向响应函数。我们比较了简单壳层模型、tam - dancoff近似、环近似和DELTA等压线激发下的核相关结果。我们考虑了以下之前没有考虑到的影响。a)去除了朗道-米格达尔参数的普适性分析。b)用位置相关有效质量来处理核势的非定域性。c)粒子-空穴态的扩散宽度。d)介子质量的核效应。e)用求和规则法估计RPA以外的核相关。II)反应侧：对反应^<12>C,^<40>Ca （p, n）进行DWIA分析。我们进行了以下以前从未做过的计算。a)无普适性的反应计算。b)计算充分考虑了NN-t矩阵各项之间的干扰。c)复合弹丸反应c （d, 2p）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）提取的自旋横向响应函数。然而，我们面临一个矛盾，即（p, n）得到的横向响应大约是理论响应的两倍大。

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.