Study of Nucleon-nucleus Optical Potential and Core-polarization of Nucleus.

本研究的科学动机是通过研究弹性和非弹性中子-核散射以及核子-核光势来明确具有核极化的原子核的基本激发模式。日本东北大学avf回旋加速器37 mev质子束产生的^7LI(p, n)^7Be反应获得了35 mev单色中子（DELTA EPSILON = 650keV）。我们已经成功地测量了^<32>S和^<12>C在E_n = 35MeV下的非弹性中子的角分布。在16 ~ 35mev的核子能量范围内，对中子和质子的散射截面进行了系统的分析。利用光势虚部与实部之间的色散关系，得到了由于核心极化引起的实项，并从Hartree-Fock平均场中约简了实项。在中子核和中子和质子的光学势的实部之间发现了一个显著的差异，从而作为核子能量的函数得到，使我们能够将它们扩展到更低的能量，甚至到负能量，在那里核子被束缚。目前得到的势可以用来预测在特定轨道上束缚核子的势深度。这个比较也很令人满意。

The scientific motivation of this study is to make clear the fundamental excitation mode of nuclei with core-polarization by investigating elastic- and inelastic- neutron-nucleus scattering as well as nucleon nucleus optical potentials. 35-MeV monochromatic neutrons ( DELTA EPSILON = 650keV) have been obtained from the ^7LI(p, n)^7Be reaction generated by 37-MeV proton beams from the AVFcyclotron at Tohoku University.We have succeeded to measure the angular distributions of inelastic neutrons from ^<32>S in addition to those from ^<12>C at E_n = 35MeV.We have carried out systematic analyzes for neutron and proton scattering cross sections in nucleon energies ranging between 16 and 35 MeV.By applying dispersion relation between imaginary and real parts in optical potential, we have obtained the real term due to core-polarization, then reduced the real term from Hartree-Fock mean field. A significant difference has been found between neutron-nucleus andThe real part of the optical potentials for neutron and protons thus obtained as functions of nucleon energies allow us to extend them to lower energy even to negative energy, where nucleons are bound. The presently obtained potential may be applied to predict the potential depth to bound a nucleon in a particular orbit. This comparison was quite satisfactory as well.