夸克势模型中的重子–重子相互作用自旋–轨道耦合势

在夸克－夸克自旋－轨道耦合势中引入了由海夸克效应产生的、与颜色自由度无关的自旋－轨道耦合势．并定性地讨论了这个势对重子谱及重子－重子相互作用计算中的影响．     

重子谱中的自旋–轨道耦合力

在组份夸克势模型的框架下,用几种夸克势模型对重子谱中N和Λ的几组L?=1负宇称激发态自旋轨道劈裂进行了分析,指出有的模型在引进了一项半唯象的自旋轨道耦合势后能解释这几组态的自旋轨道耦合能级劈裂的实验值     

N—N相互作用中自旋轨道耦合力的夸克模型

在夸克-夸克相互作用中考虑了单胶子交换的自旋轨道耦合力、由禁闭势导出的自旋轨道耦合力、由手征场σ交换提供的自旋轨道耦合力以及由双胶子交换提供的自旋轨道耦合力,从而可以统一地解释重子谱中的自旋轨道耦合效应及N-N散射中的各个分波的相移.     

N—N相互作用中自旋轨道耦合力的夸克模型

在夸克－夸克相互作用中考虑了单胶子交换的自旋轨道耦合力、由禁闭势导出的自旋轨道耦合力、由手征场σ交换提供的自旋轨道耦合力以及由双胶子交换提供的自旋轨道耦合力，从而可以统一地解释重子谱中的自旋轨道耦合效应及Ｎ－Ｎ散射中的各个分波的相移．     

重子相互作用和双重子

本文提出了一个新的夸克势模型－夸克脱定域色屏蔽模型。此模型不用介子交换就给出既有排斥心又有中程吸引的核力，并且定性符合Ｎ－Ｎ散射相移＾１Ｓｏ、＾３Ｓｒ、＾１Ｐ１和＾Ｐ１ｓ。首次从动力学证明了可能存在两类双重子。     

单胶子交换正反夸克对产生模型中的自旋轨道耦合力

从单胶子交换正反夸克对产生模型出发,研究了核子间等效ρω介子交换势.计算结果表明这个模型能得到强子层次核力介子交换理论中ρ,ω介子交换势的各个部分,并且定性性质与传统的介子交换势也是相同的.     

重子相互作用和双重子

本文提出了一个新的夸克势模型──夸克脱定域色屏蔽模型．此模型不用介子交换就给出既有排斥心又有中程吸引的核力,并且定性符合Ｎ－Ｎ散射相移１Ｓ０、３Ｓ１、１Ｐ１和３Ｐ１ａ首次从动力学证明了可能存在两类双重子．一类是像氘核那样的低自旋、弱束缚的双重子,另一类是高自旅、强束缚的六夸克态,ｄ就是一个典型例子,它很可能是一个窄双重子共振态．一个平行的相对论性夸克势模型证实了与上述非相对论势模型有关的双重子态的预言． A new quark potential model, called quark delocalization and color screening model, has been proposed.This model yields both N-N repulsive core and intermediate range attraction without involving the meson exchange and fits the N-N 1S0,3S1,1p1and 3Pls phase shifts qualitatively. It verified dynamically that there might be two kinds of dibaryons.One is the deuteron like low spin, loosely binding two baryon states.The other is the high spin, strong binding six quark states, d. is a typical example and is...     

具有奇异夸克系统的重子波函数

在重子波函数中考虑了s夸克与u,d夸克质量的差别,构造了把坐标空间与味空间联合成SU(3)_rf的SU(3)_rf×SU(2)_s×SU(3)_c群分类夸克间全反对称的重子波函数.与不考虑s夸克与u,d夸克质量差的SU(n)_r×SU(3)_f×SU(2)_s×SU(3)_c群分类的波函数作了比较,它们的相互作用能量矩阵元有明显的差别.     

由正反夸克对激发产生的夸克间的等效相互作用势

由单胶子交换正反夸克对产生模型出发,讨论了两重子间相当于介子交换过程的夸克间的等效相互作用.结果指出这个过程既有两个夸克间的相互作用,也有三个夸克间的相互作用.并且这个等效的两夸克间相互作用具有比OGEP更普遍的形式.     

重子产生中"自旋抑制"的原因及普适性

高能反应中,自旋3+/2重子的产生与1+/2重子相比,受到反常的极强抑制.本文证明这是夸克味道守恒的结果:多重产生中奇异夸克抑制.λ=/<1,决定了十重态重子只能以确定比例β与八重态重子一起产生,而且β=1+λ/3+2λ     

Spin-Orbit Force of NN Interaction Based on Chiral SU(3) Quark Model

Spin-orbit force of the NN interaction is studied in the framework of the chiral SU(3) quark model. Both symmetric and antisymmetric spin-orbit (LS) forces of the one gluon exchange and scalar meson exchanges are taken into account. It is shown that although the inclusions of the LS forces caused by the scalar meson exchanges and the antisymmetric LS terms in this model can notably strengthen the LS couplings in the states of ³P_J of the NN interaction, an additional enhancement factor is still needed in order to describe the experimental data.     

Baryon Magnetic Moment and Beta Decay Ratio in Colored Quark Cluster Model

Baryon magnetic moments of p, n, ∑^＋,∑^-,Ξ^0, Ξ^- and the beta decay ratios （G A/Gv ） of n → p, ∑^-→n and Ξ^0→∑^＋ are calculated in a colored quark cluster model. With SU（3） breaking, the model gives a good fit to the experimental values of those baryon magnetic moments and the beta decay ratios. Our results show that the orbital motion has a significant contribution to the spin and magnetic moments of those baryons and the strange component in nucleon is small.     

对于组分夸克模型的几点评注

根据现有的格点QCD结果和手征对称自发破缺理论研讨了组分夸克模型中夸克囚禁和夸克介子耦合方案.指出了两体囚禁势不能直接推广应用于多夸克系统,σ介子作为双π交换的等效描述只能用于u,d夸克,不能用于s夸克.     

Extended Quark Potential Model from Random Phase Approximation

The quark potential model is extended to include the sea quark excitation using the random phase approx-imation. The effective quark interaction preserves the important QCD properties - chiral symmetry and confinementsimultaneously. A primary qualitative analysis shows that the π meson as a well-known typical Goldstone boson andthe other mesons made up of valence qq quark pair such as the ρ meson can also be described in this extended quarkpotential model.     

Solutions of Woods-Saxon Potential with Spin-Orbit and Centrifugal Terms through Nikiforov-Uvarov Method

In this study, the analytical solutions of the radial Schrödinger equation for the central Woods-Saxon potential together with spin-orbit interaction and centrifugal terms have been derived by using Nikiforov-Uvarov method. The energy eigenvalues and corresponding eigenfunctions of nucleons have been obtained for various values of n, l, and j quantum numbers. The obtained results using this method are in satisfactory agreement with available data in the special case.     

An Extended Chiral SU(3) Quark Model

The chiral SU(3) quark model is extended by including the vector meson exchanges to describe the short range interactions. The phase shifts of NN scattering are studied in this model. Compared with the results of the chiral SU(3) quark model in which only the pseudo-scalar and scalar chiralfields are considered, the phase shifts of 1 So wave are obviously improved.     

Nucleon Spin Content in a Relativistic Quark Potential Model Approach

Based on a relativistic quark model approach with an effective potential U(r) = (ac/2)(1 + γ0)r2, the spin content of the nucleon is investigated. Pseudo-scalar interaction between quarks and Goldstone bosons is employed to calculate the couplings between the Goldstone bosons and the nucleon. Different approaches to deal with the center of mass correction in the relativistic quark potential model approach are discussed.     

磁场中夸克物质的非轻子弱作用过程

讨论了磁场中夸克物质的非轻子弱作用过程. 改进了在弱磁场情况下的近似计算方法, 分别给出了强弱磁场下非轻子过程的反应率的表达式, 以及一定条件下的近似表达式. 结果显示, 强磁场极大的抑制反应率的大小, 进而影响奇异夸克物质的粘滞性.