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101.
对多体关联Green函数的基本动力学方程组作等时极限,得到了密度矩阵形式的多体关联动力学方程组,并证明了各种不同时序的等时极限间的等价性. 相似文献
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We have calculated and compared the three-body force effects on the properties of nuclear matter under the gap and continuous choices for the self-consistent auxiliary potential within the Brueckner-Hartree-Fock approach by adopting the Argonne V18 and the Bonn B two-body potentials plus a microscopic three-body force (TBF). The TBF provides a strong repulsive effect on the equation of state of nuclear matter at high densities for both the gap and continuous choices. The saturation point turns out to be much closer to the empirical value when the continuous choice is adopted. In addition, the dependence of the calculated symmetry energy upon the choice of the self-consistent auxiliary potential is discussed. 相似文献
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The neutron 3PF2 pairing gap in pure neutron matter, neutron 3PF2 gap and neutron-proton 3SD1 gap in symmetric nuclear matter have been studied by using the Brueckner-Hartree-Fock(BHF) approach and the BCS theory. We have concentrated on investigating and discussing the three-body force effect on the nucleon superfluidity. The calculated results indicate that the three-body force enhances remarkably the 3PF2 superfluidity in neutron matter. It also enhances the 3PF2 superfluidity in symmetric nuclear matter and its effect increases monotonically as the Fermi-momentum kF increases, whereas the three-body force is shown to influence only weakly the neutron-proton 3SD1 gap in symmetric nuclear matter. 相似文献
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滴线核的质子发射 总被引:1,自引:0,他引:1
质子放射性是极端丰质子核的一个重要性质 .球形核的质子发射用 WKB方法可以很好地描述 ,变形核的质子发射则须解耦合道的薛定谔方程 .通过140Ho和141Ho质子发射体的研究可给出非束缚 Nilsson轨道的结构信息.Proton emission is a very important property of the extreme proton rich nuclei. It is introduced that the proton emission from a spherical nucleus can be well described by WKB method, while that from a deformed nucleus must be described by means of solving coupled channel Schrdinger equations. The investigation of the proton emitters 140Ho, 141Ho offered information about the structure of unbound Nilsson orbitals. 相似文献
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重离子碰撞中的同位旋效应 总被引:1,自引:0,他引:1
根据近年来利用同位旋相关输运理论在中能重离子碰撞同位旋效应研究方面的成果 ,并结合国际上在该问题上的进展 ,综合介绍和分析了中能重离子碰撞中的多重碎裂、原子核阻止和前平衡发射中子-质子比的同位旋效应及其随入射道条件:入射能量、碰撞参数、碰撞系统的质量 ,特别是随中子-质子比的演化过程.讨论了利用以上物理观测量在提取同位旋非对称核物质状态方程知识方面的可能性 ,并对其发展进行了展望. Based on the achievements for the intermediate energy heavy ion collision in our recent work and the progresses in the world, the isospin effects and the dependence of the entrance channel conditions on them in the intermediate energy heavy ion collisions were introduced, analysed and commended. From the calculation results by using isospin dependence quantum molecular dynamics, it is clear to see that the nuclear stopping power strongly depends on the in medium isospin dependence... 相似文献
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量子色动力学(QCD)求和规则是强子物理研究中的一种重要的非微扰方法, 已经成为强子物理与核物理研究中有力的工具。 简单介绍了QCD求和规则的基本概念、 方法与应用, 特别讨论了QCD求和规则近年来的发展和与之相关的一些前沿问题。 QCD sum rule is an important nonperturbative method in hadron physics, it has been a powerful technique in study of hadron physics and nuclear physics.We give a brief introduction to the basic idea, the method and its application of QCD sum rule, emphasize the development of this method and some topics in recent years. 相似文献