Study of Collective Motion and Effective Interaction in High Excitation and High Momentum Transfer States by Quasielastic Scattering
Project/Area Number  05640328 
Research Category 
GrantinAid for Scientific Research (C).

Research Field 
素粒子・核・宇宙線

Research Institution  The University of Tokyo 
Principal Investigator 
ICHIMURA Munetake The University of Tokyo, College of Arts and Science, Professor, 教養学部, 教授 (10012436)

CoInvestigator(Kenkyūbuntansha) 
KAWAHIGASHI Ken Kanagawa Universtity, Faculty of Science, 理学部, 助手 (70231272)

Project Fiscal Year 
1993 – 1995

Project Status 
Completed(Fiscal Year 1995)

Budget Amount *help 
¥2,200,000 (Direct Cost : ¥2,200,000)
Fiscal Year 1995 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1994 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1993 : ¥800,000 (Direct Cost : ¥800,000)

Keywords  spinisospin modes / response function / quasielastic scattering / DWIA / RPA / DELTA isobar / (p, n) reaction / polarization transfer / スピン・アイソスピン・モード / 応答関数 / 準弾性散乱 / Δ粒子 / (p,n)反応 / 偏極移行量 / △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 
Research Abstract 
We studied excitation of the spenisospin modes in the quasielastic 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 TammDancoff 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 LandauMigdal parameters was removed. b) Nonlocality of the nuclear potential was treated by the position dependent effective mass. c) Spreading width of the particlehole 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 NNt matrix. c) Glauber analysis of a composite projectile reaction C (d, 2p). The theoretical analysis reasonably explained the spinlongitudinal response funcions obtained by (p, n), and the spintransverse 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.

Report
(5results)
Research Output
(19results)