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

核子-核光势和核的核偏振的研究。

基本信息

批准号：
03640259
负责人：
ORIHARA Hikonojo
金额：
$ 1.54万
依托单位：
Tohoku 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：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03640259/
关键词：
(p, n)Reaction Neutron Beam Fast Neutron Time of Flight Optical Potential Core-polarization Neutron Scattering Neutron in-elastic Scattering Dispersion Relation 単色中性子ビ-ム ^<32>S

项目摘要

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.

这项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学势来弄清具有核极化的核的基本激发模式。用东北大学AVF回旋加速器的37 MeV质子束在^7Li(p，n)^7Be反应中获得了35 MeV的单色中子(Delta Epsilon=650keV)。除了^&lt；32&gt；S的非弹性中子角分布外，我们还成功地测量了^&lt；C，E_n=35 MeV。我们对16-35 MeV核子能量范围内的中子和质子散射截面进行了系统的分析。利用光学势中虚部和实部之间的色散关系，我们得到了核偏振的实项，然后从Hartree-Fock平均场中约化了实项。在中子核和由此得到的中子和质子的光学势的实部之间发现了显著的不同，因为核子能量的函数允许我们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。目前获得的势可用于预测将核子束缚在特定轨道上的势深度。这一比较也相当令人满意。