By examining the structure in momentum and coordinate space of a two-body interaction spherically symmetric in its local coordinate, we demonstrate that it can be disentangled into two distinctive contributions. One of them is a medium-independent and momentum-conserving term, whereas the other is functionally --and exclusively-- proportional to the radial derivative of the reduced matrix element. As example, this exact result was applied to the unabridged optical potential in momentum space, leading to an explicit separation between the medium-free and medium-dependent contributions. The latter does not depend on the strength of the reduced effective interaction but only on its variations with respect to the density. The modulation of radial derivatives of the density enhances the effect in the surface and suppresses it in the saturated volume. The generality of this result may prove to be useful for the study of surface-sensitive phenomena.
Relativistic Calculations for Photonuclear Reactions (II). Nonrelativistic reductions and nuclear medium effects
利用有效的Pauli约化方案,将直接敲除对核上$\left( γ, p \right)$反应贡献的相对论振幅约化为非相对论形式.在核子质量的倒数中,将约化进行到二阶。结果发现,出现在非相对论振幅的相互作用哈密顿量有显着的依赖性,从二阶开始,矢量和标量平均核势。传统的非相对论计算中不存在这些强烈的介质修改。详细的比较表明,这些修改是至关重要的理解相对论和非相对论模型之间的差异。这些差异也检查通过减少相对论振幅通过的Foldy-Wouthuysen变换。在这种情况下也获得了类似的介质修改。我们讨论了现有的非相对论计算的一致性,这些介质修改的影响。
Time-dependent covariant density functional theory in 3D lattice space: benchmark calculation for 16O + 16O reaction
在不受对称性限制的三维坐标空间中发展了含时协变的密度泛函理论,并对16 O +16 O反应进行了系统的基准计算.的相对论运动学,动量守恒定律,总能量,粒子数,以及时间反演不变性进行了检查,并确认满足数值。两个主要的应用,包括耗散动力学和势垒以上的融合截面示出。所得结果与非相对论含时密度泛函理论和已有的实验数据符合得很好。这表明新发展的含时协变密度泛函理论可以作为研究核动力学过程的有效方法。
Functional approach to the non-mesonic decay of Lambda-hypernuclei
本文在极化传播子方法的框架内计算了Lambda超核(Lambda N -> NN,Lambda NN -> NNN)的非介子衰变宽度。根据玻色子环展开式的规定,用泛函方法对核物质中的全λ自能进行了微观计算,为相关图的分类提供了一个理论上有充分根据的近似方案.我们采用平均费米动量,适当地适应不同的质量数区域(中轻,中,重超核)。此外,我们还研究了衰变率对NN和Lambda-N短程关联的依赖性。在新的近似方案中,通过适当选择控制这些关联的参数,有可能重现A > 10超核的实验衰变宽度。
Medium-Induced Quarkonium Dissociation at Finite Chemical Potential and Weak Magnetic Field
Discipline of Natural Sciences, PDPM IIITDM(PDPM印度理工学院德里曼德拉技术学院自然学系);Department of Physics, Lords Institute of Engineering and Technology(洛兹工程技术学院物理系);Key Laboratory of Quark and Lepton Physics (MOE) & Institute of Particle Physics, Central China Normal University(华中师范大学夸克与轻子物理教育部重点实验室及粒子物理研究所);Department of Physics, Integral University(Integral大学物理系);Department of Physics, Institute of Science, Banaras Hindu University (BHU)(贝拿勒斯印度教大学科学研究所物理系)