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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.

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-核光学势来弄清楚具有核极化的核的基本激发模式。35-从东北大学AVF回旋加速器的37 MeV质子束产生的^7Li（p，n）^7Be反应中获得了MeV单色中子（Δ EPSILON = 650 keV），我们成功地测量了E_n = 1.2MeV时来自^ S和来自^ C的非弹性中子的角分布<32><12>。本文利用色散关系，对核子能量在16 - 35 MeV范围内的中子和质子散射截面进行了系统的分析在光学势的虚部和真实的部之间，我们得到了由核偏振引起的真实的项，然后由Hartree-Fock平均场约化了真实的项。由此得到的中子和质子光学势的真实的部分作为核子能量的函数，使我们能把它们推广到较低的能量，甚至负能量，在那里核子是束缚的。目前得到的势可用于预测核子在特定轨道上的束缚势深度。这样的对比，也是令人满意的。