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Theoretical Studies of Polarization Phenomena in Nuclear Reactions at Intermediate energies

中能核反应极化现象的理论研究

基本信息

批准号：
63540226
负责人：
TANIFUJI Makoto
金额：
$ 1.02万
依托单位：
Hosei University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

Spin-dependent interactions and reaction mechanisms are investigated through polarization phenomena in nuclear reactions at intermediate energies. The main results obtained are as follows.1) Elstic scattering of deuterons Scattering amplitudes are successfully decomposed into spin-classified amplitudes which correspond to each spin-dependent interactions, by the help of the invariant-amplitude method. This clarifies that the deuteron-nucleus interaction consists of the central, LS, T_R-type tensor and T_L-type tensor interactions, the last one being produced by the second- order of the LS interaction which includes the virtual-breakup effect.2) (d,p) reactions The method in 1) is extended so as to be applicable to (d,p) reactions, for which some important theoretical predictions are made by the present formalism for polarization observables. Particularly, the theory is quite successful in the analyses of the low-energy experimental data which have been obtained in Kyushu University Tandem Facilities.3) d^^<->>+p^<->> ^3He+pi^0 reaction The invariant-amplitude method is applied to d^^<->>+p fusion pion production. From the tensor analyzing power at rheta = 0 and pi at the threshold, the important information on the S-wave scattering length of pi-N scattering is derived and it is clarified that the conventional data on the scattering length are quite doubtful in the precision. The extension of such investigations to higher energies is now in progress by the computer work.4) Analyses of nuclear reactions by the Faddeev method The application of the Faddeev method to the ordinary deuteron elastic scattering by a nucleus is attempted and the N-^<12>C separable potential is now obtained.

通过中能核反应中的极化现象研究了自旋相关的相互作用和反应机理。主要结果如下：1）利用不变振幅方法成功地将散射振幅分解为自旋分类振幅，分别对应于每个自旋相关相互作用。这说明氘-核相互作用由中心相互作用、LS相互作用、T_R型张量相互作用和T_L型张量相互作用组成，后者是由包含虚破裂效应的二级LS相互作用产生的。2）（d，p）反应将1）中的方法推广到（d，p）反应，本文提出的偏振观测量形式对此作了一些重要的理论预言。特别地，该理论在分析九州大学串列实验装置的低能实验数据时是相当成功的。3）d^^<->>+p^<->> ^3He+pi^0反应将等振幅方法应用于d^^<->>+p聚变π介子的产生。本文从张量分析功率reta = 0和π的阈值出发，导出了π-N散射的横波散射长度的重要信息，并阐明了传统的散射长度数据在精度上是值得怀疑的。4）用Faddeev方法分析核反应尝试将Faddeev方法应用于普通氘原子核的弹性散射，得到了N-^<12>C可分势。