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

高激励高动量传递态的集体运动和有效相互作用的准弹性散射研究

• 批准号: 05640328
• 负责人: ICHIMURA Munetake
• 金额: $ 1.41万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640328/
• 关键词: spin-isospin modes; response function; quasi-elastic scattering; DWIA; RPA; DELTA isobar; (p, n) reaction; polarization transfer; △粒子; (e,e′); (p^^→,n^^→); 有効相互作用; ランダウ・ミグダル・バラメータ

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.

从理论上研究了准弹性区域中自旋-同位旋模的激发。我们还分析了与LAMPF和哥本哈根小组合作的实验数据。i)结构方面：我们用连续介质RPA计算了等矢量自旋的纵向和横向响应函数，比较了简壳模型、Tamm-Dancoff近似下的核关联、环近似下的结果以及Delta等压线激发下的结果。我们考虑了以下以前没有考虑到的影响。A)去掉了Landau-Migdal参数的普适性。B)用与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)核效应对Rho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^&lt；12&gt；C，^&lt；40&gt；Ca(p，n)进行了DWIA分析。我们进行了以下以前从未进行过的计算。A)没有普适性的反应计算。B)完全包含NN-t矩阵所有项之间的干扰的计算。C)复合弹丸反应C(d，2p)的Glauber分析.理论分析合理地解释了(p，n)得到的自旋-纵向响应函数和(e，e)得到的自旋-横向响应函数.然而，我们面临着一个矛盾，即(p，n)得到的横向响应大约是理论响应的两倍。

项目成果

A.Itabashi,K.Aizawa M.Ichimura: "Quasi-Elastic d(p^^→,n^^→)2p Reaction and Spin Response Functions of the Deuteron" Prog.Theoret.Phys.91. 69-83 (1994)

A.Itabashi、K.Aizawa M.Ichimura：“氘核的准弹性 d(p^^→,n^^→)2p 反应和自旋响应函数”Prog.Theoret.Phys.91 (1994)。 ）

T.N.Taddeucci: "Momentum dependence of the nuclear isovector spin responses from (p, n) reactions at 494MeV" Phys.Rev.Letts.73. 3516-3519 (1994)

T.N.Taddeucci：“494MeV (p, n) 反应的核等矢量自旋响应的动量依赖性”Phys.Rev.Letts.73。

T. N. Taddeucci: "Momentum dependence of the nuclear isovector spin responses from (p,n)reactions at 494MeV" Phys. Rev. Letts.73. 3516-3519 (1994)

T. N. Taddeucci：“494MeV 下 (p,n) 反应的核等矢量自旋响应的动量依赖性” Phys。

T.N.Taddeuca et al.: "Momentumdependence of the nuclear isovector spin responses from (p^^→,n^^→) reactions at 494 Mev" Phys.Rev.Letts.73. 3516-3519 (1994)

T.N.Taddeuca 等人：“494 Mev 时 (p^^→,n^^→) 反应的动量依赖性”Phys.Rev.Letts.73 (1994)。

M.Ichimura: "Spin-isospin response functions in quasi-elastic region" Nud.Phys.A.577. 123c-130c (1994)

M.Ichimura：“准弹性区域中的自旋-同位旋响应函数”Nud.Phys.A.577。