核子有效相互作用及不稳定原子核性质研究

项目名称： 核子有效相互作用及不稳定原子核性质研究

项目编号： No.10875150

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 曹李刚

作者单位： 中国科学院近代物理研究所

项目金额： 34万元

中文摘要： 密切结合国内外放射性大科学装置的物理目标以及相关核物理实验，我们开展了核子-核子有效相互作用以及原子核能量密度泛函等方面的研究。基于微观的Brueckner Hartree-Fock量子多体理论，我们研究了介质极化对对称核物质以及纯中子物质中1S0道核子-核子对相互作用的影响，讨论了屏蔽和反屏蔽效应的物理机制；基于微观的BCS理论讨论了反对称核物质中同位旋相关的核子-核子对相互作用；研究了能量密度泛函理论和有限力程可分离对相互作用的超流性质及其在有限核性质中的应用；结合最新的Pygmy共振实验结果以及微观的无规位相近似数值计算，利用各种能量密度泛函讨论了核物质不对称能的密度依赖性；预言了丰质子原子核Ne17可能存在低能Pygmy共振；基于自洽的Skyrme Hartree-Fock以及无规位相近似计算，讨论了Skyrme能量密度泛函中张量相互作用部分对原子核各种集体激发态的影响，分析了平均场以及张量剩余相互作用的贡献；建立和完善了连续的相对论无规位相近似理论以及相应的数值计算程序。

中文关键词： 微观模型；同位旋相关性；对关联；能量密度泛函；新激发 模式。

英文摘要： Based on the microscopic Brueckner Hartree-Fock calculations, we have studied the effect of medium polarization to the 1S0 channel neutron-neutron pairing interaction in symmetric nuclear matter and pure neutron matter, and also shown the underliying mechanism of the screening and anti-screening effect. The isospin dependence of the effective pairing interaction is discussed on the basis of the BCS theory of superfluid asymmetric nuclear matter, the construction of a zero-range effective pairing interaction compatible with the neutron and proton gaps in homogeneous matter is investigated. A separable pairing interaction is introduced in the covariant density functional theory, this finite range separable pairing force is applied to study the properties of the ground and excited states of nuclei in the RHB and RRPA. Correlations between the nuclear symmetry energy, the neutron skins, and the percentage of energy-weighted sum rule exhausted by the pygmy dipole resonance are investigated in the density functional theory (DFT) and covariant DFT with various parameterizations, a comparison with the experimental data has allowed us to constrain the value of the slope of the symmetry energy at saturation. Possible low-lying electric dipole strengths in proton-rich nuclei 17F and 17Ne, which might be produced at HIRFL-CSR in Lanzhou, are investigated in the framework of the covariant density functional theory. We have analysized the effects of tensor interaction on the multipole responses of nuclei using the fully self-consistent RPA model with Skyrme interactions, we disentangle the modifications to the static mean field induced by the tensor terms, and the specific features of the residual particle-hole tensor interaction. A fully self-consistent relativistic continuum RPA is constructed by using the single-particle Green's function technique, numerical results of the RCRPA are checked with the constrained relativistic mean-field theory.

英文关键词： Microscopic Model; Isospin Dependence; Nucleon Pairing; Energy Density Functional theory; Exotic Resonance Modes.