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STUDY OF SPIN-ISOSPIN AND DELTA MODES IN INTERMEDIATE NUCLEAR REACTIONS

中间核反应中自旋-等旋和δ模式的研究

基本信息

批准号：
02640215
负责人：
ICHIMURA Munetake
金额：
$ 1.66万
依托单位：
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：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

项目摘要

1. Isospin-spin modes excitation in quasi-elastic scattering region(1) Isospin-spin modes are studied by quasi-elastic(p,n)reactions in collaboration with experimentalists in LAMPF.We made model calculation by DWIA and continuum RPA with orthogonality condition. The observed ratio of the spin longitudinal to transverse response functions implies week RPA type correlations in the high momentum transfer region.(2) A more reliable method than before is proposed for extracting spin response functions from observed polarization transfers. It is based on PWIA and optimal factorization for the t matrix.(3) Difference between the ordinary continuum RPA and the one with orthogonality condition is clarified and importance of the condition is numerically studied.(4) The universality condition for the g parameters of the short range correlation is relaxed and their dependence of spin response functions are studied.(5) We calculated the spin longitudinal and transverse response functions of deutero … More n which are standard for the analysis of the nuclear response functions. Their ratio is found considerably energy dependent,which had been considered to be unity.2. DELTA-isobar excitation(1) A collective-coordinate quantization method for 1+1 dimensional soliton models are proposed to derive Born terms for meson-soliton scattering. The quantized Hamiltonian does not possess the Yukawa coupling but the linear and quadratic meson soliton interactions which reproduce rigorously the Born term for meson-soliton scattering. This method was applied to the Skyrme model to derive the Born terms for pion nucleon elastic scattering and pion photoproduction.(2) Various problems were investigated concerning the quantization of gauge field theories in a finite box constrained by the periodic boundary conditions. We used a unitary transformation method to eliminate unphysical degrees of freedom in the Weyle gauge Hamiltonian. We obtained the quantized Hamiltonian which contains zero modes as important physical degrees of freedom.(3) Electromagnetic,axial-vector,and strong off-shell form factors are introduced consistently with the PCAC hypothesis and gauge invariance. We showed that the divergence of the off-shell electromagnetic form factors in the chiral limit entails a modification of the celebrated low-energy theorem for the pion photoproduction. Less

1.准弹性散射区中的同位旋模激发（1）在LAMPF中与实验工作者合作，利用准弹性（p，n）反应研究了同位旋模的激发，采用DWIA和连续RPA在正交条件下进行了模型计算。所观察到的自旋纵向横向响应函数的比例意味着弱RPA型关联在高动量转移区。(2)提出了一种从观测到的极化转移中提取自旋响应函数的方法。它是基于PWIA和t矩阵的最优分解。(3)阐明了普通连续介质RPA与正交条件RPA的区别，并对正交条件的重要性进行了数值研究。(4)放宽了短程关联g参数的普适性条件，研究了它们与自旋响应函数的关系。(5)我们计算了氘的自旋纵、横响应函数 ...更多信息 n，这是分析核响应函数的标准。发现它们的比值与能量有很大的依赖关系，这一比值曾被认为是统一的.（1）提出了1+1维孤子模型的集体坐标量子化方法，导出了介子-孤子散射的玻恩项。量子化的哈密顿量不具有汤川耦合，但线性和二次介子孤子相互作用，严格再现了介子孤子散射的玻恩项。将此方法应用于Skyrme模型，导出了π介子核子弹性散射和π介子光生的玻恩项。(2)研究了受周期边界条件约束的有限盒中规范场论量子化的各种问题。我们用么正变换的方法消除了Weyle规范哈密顿量中的非物理自由度。我们得到了量子化的哈密顿量，其中包含零模式作为重要的物理自由度。(3)电磁，轴向矢量和强离壳形状因子的引入与PCAC假设和规范不变性一致。我们表明，在手征极限的离壳电磁形状因子的发散需要修改的著名的低能定理的π光生。少