Project/Area Number  02640215 
Research Category 
GrantinAid for Scientific Research (C).

Research Field 
核・宇宙線・素粒子

Research Institution  University of Tokyo 
Principal Investigator 
ICHIMURA Munetake UNIVERSITY OF TOKYO,COLLEGE OF ARTS AND SCIENCES,PROFESSOR, 教養学部, 教授 (10012436)

CoInvestigator(Kenkyūbuntansha) 
OHTA Koichi UNIVERSITY OF TOKYO,COLLEGE OF ARTS AND SCIENCES,ASSOCIATE PROFESSOR, 教養学部, 助教授 (30012496)

Project Fiscal Year 
1990 – 1992

Project Status 
Completed(Fiscal Year 1992)

Budget Amount *help 
¥2,600,000 (Direct Cost : ¥2,600,000)
Fiscal Year 1992 : ¥600,000 (Direct Cost : ¥600,000)
Fiscal Year 1991 : ¥600,000 (Direct Cost : ¥600,000)
Fiscal Year 1990 : ¥1,400,000 (Direct Cost : ¥1,400,000)

Keywords  quasifree scattering / (p,n)reaction / spinisospin modes / DWIA / pion nucleon scattering / pion photoproduction / Skyrmion / QCD / 準自由散乱 / (P,n)反応 / スピンアイソスピンモード / π中間子核子散乱 / π中間子光生成 / スカーミオン / 量子色力学 / (p,n)反応 / スピン・アイソスピン・モード / スピン・アイソスピン・モド / ソリトン / スカミオン / 光円錐量子化法 / △アイソバ / 中間子核子散乱 / SRyrme模型 
Research Abstract 
1. Isospinspin modes excitation in quasielastic scattering region (1) Isospinspin modes are studied by quasielastic(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. DELTAisobar excitation (1) A collectivecoordinate quantization method for 1+1 dimensional soliton models are proposed to derive Born terms for mesonsoliton 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 mesonsoliton 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,axialvector,and strong offshell form factors are introduced consistently with the PCAC hypothesis and gauge invariance. We showed that the divergence of the offshell electromagnetic form factors in the chiral limit entails a modification of the celebrated lowenergy theorem for the pion photoproduction. Less
