Theoretical Studies of Polarization Phenomena in Nuclear Reactions at Intermediate energies

点击翻译按钮获取中文摘要

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.