STUDY OF NUCLEON-NUCLEON CORRELATION IN NUCLEI

本项目的主要结果如下：1)利用标记光子的光核反应。1)在巨共振以上的激发能范围内，^&lt；40&gt；Ca(Gamma，n)截面可以用准重子模型解释。2)(Gamma，pp)反应中两个质子的角关联表现出背靠背的关联。3)IVGQR的位置和宽度是从^&lt；13&gt；C(Gamma，n)实验中得到的。(e，e‘p)，(e，e’t)反应1)在^&lt；12&gt；C(e，e‘po)反应中，通过E_1和E_2共振反应的重要性被证明。2)在^6Li(e，e’p)反应中观察到较大的L-T干扰，而在^6Li(e，e‘t)反应中没有观察到。(e，e‘n)反应1)^&lt；12&gt；C(e，e’n)反应产生的中子角分布是^&lt；12&gt；C(e，e‘p)反应中质子的异相分布。C(Gamma，n)截面到具有一定等自旋的终态。3)在^&lt；40&gt；Ca(Gamma，n)反应的角分布中也观察到了激发态的等自旋效应。建立了连接两个实验区的新型束流传输系统。说明了进行寄生实验的可能性。研讨会和研讨会1)“利用内靶进行电子散射实验的研讨会”于1992.2-12月18-19日在核科学实验室举行)比利时根特大学的J.Ryckebusch博士应邀举办了一系列关于现代光核反应理论的研讨会。

The main results obtained in the present project are as follow.1.Photo-nuclear reactions using tagged photons.1) At the excitation energies above the giant resonances, ^<40>Ca(gamma, n) cross sections could be explained by the quasi-deuteron model.2) Angular correlatious of two protons from the (gamma, pp) reaction showed back to back correlations like in the (gamma, pn) reaction.3) The position and the width of the IVGQR were obtained from the ^<13>C(gamma, n) experiment.2. (e, e'p), (e, e't) reactions1) The importance of the processes via E1 and E2 resonances was shown in ^<12>C(e, e'po) reaction.2) A large L-T interference was observed in the ^6Li(e, e'p) reaction, however not in the ^6Li(e, e't) reaction.3. (e, e'n) reactions1) The angular distribution of neutrons from the ^<12>C(e, e'n) reaction was found to be an out of phase of protons in the ^<12>C(e, e'p) reaction.2) The iso-spins of the giant dipole resonances in ^<13>C were determined by observing the ^<13>C(gamma, n) cross sections to final states with definite iso-spin.3) The effect of the iso-spin of the excited states were also observed in the angular distribution of the ^<40>Ca(gamma, n) reaction.4. A new beam transport system which connects two experimental areas were constructed. The possibility of doing the parasitic experiment was shown.5. Workshop and Seminar1) "Workshop on electron scattering experiment using internal target" was held at the Laboratory of Nuclear Science in Dec.18-19, 1992.2) A series of seminars on modern theories of photo-nuclear reactions was given by Dr. J.Ryckebusch invited from the University of Gent at Belgium.