检索结果-南通市图书馆

Tensor coupling effect on relativistic symmetries

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2016年第8期59卷 34-42页

作者： ShouWan Chen DongPeng Li JianYou Guo School of Physics and Material Science Anhui University School of Electronic and Information Engineering Hefei Normal University

The similarity renormalization group is used to transform the Dirac Hamiltonian with tensor coupling into a diagonal form. The upper(lower) diagonal element becomes a Schr¨odinger-like operator with the tensor component separated from the original *** on the operator, the tensor effect of the relativistic symmetries is explored with a focus on the single-particle energy contributed by the tensor coupling. The results show that the tensor coupling destroying(improving) the spin(pseudospin) symmetry is mainly attributed to the coupling of the spin-orbit and the tensor term, which plays an opposite role in the single-particle energy for the(pseudo-) spin-aligned and spin-unaligned states and has an important influence on the shell structure and its evolution.

关键词：张量耦合对称性相对论耦合效应 Hamiltonian 自旋轨道耦合单粒子能量分离算子

Optimization of the imaginary time step evolution for the Dirac equation

在线全文

学校读者我要写书评

暂无评论

中国科学：物理学、力学、天文学英文版 2011年第2期54卷 231-235页

作者： LI FangQiong1,ZHANG Ying2,LIANG HaoZhao2,3 & MENG Jie4,2,5 1Guizhou University for Nationalities,Guiyang 550025,China 2State Key Lab Nuclear Physics & Technology,School of Physics,Peking University,Beijing 100871,China 3Institut de Physique Nucle’aire,IN2P3-CNRS and Universite’ Paris-Sud,F-91406 Orsay Cedex,France 4School of Physics and Nuclear Energy Engineering,Beihang University,Beijing 100191,China 5Department of Physics,University of Stellenbosch,Stellenbosch,South Africa Guizhou University for Nationalities Guiyang China State Key Lab Nuclear Physics & Technology School of Physics Peking University Beijing China Institut de Physique Nucléaire IN2P3-CNRS and Université Paris-Sud Orsay Cedex France School of Physics and Nuclear Energy Engineering Beihang University Beijing China Department of Physics University of Stellenbosch Stellenbosch South Africa

Taking the single neutron levels of 12C in the Fermi sea as examples,the optimization of the imaginary time step(ITS) evolution with the box size and mesh size for the Dirac equation is *** the weakly bound states,in order to reproduce the exact single-particle energies and wave functions,a relatively large box size is *** long as the exact results can be reproduced,the ITS evolution with a smaller box size converges faster,while for both the weakly and deeply bound states,the ITS evolutions are less sensitive to the mesh ***,one can find a parabola relationship between the mesh size and the corresponding critical time step,i.e.,the largest time step to guarantee the convergence,which suggests that the ITS evolution with a larger mesh size allows larger critical time step,and thus can converge faster to the exact *** conclusions are very helpful for optimizing the evolution procedure in the future self-consistent calculations.

关键词：时间演化步长优化狄拉克方程 Dirac方程网目尺寸收敛速度单粒子能量大肠杆菌

有限核的相对论密度相关的Hartree近似

在线全文

学校读者我要写书评

暂无评论

河北建筑工程学院学报 1996年第1期14卷 94-99页

作者： R.Brockmann H.Toki 张秀荣河北建筑工程学院物理教研室

我们对有限核的相对论密度相关Hartree近似作了进一步的研究,其中相对论Hartree拉氏函数的耦合常数被构造成密度相关的,并且是从核物质的相对论B-H-F结果得到的。^(16)O和^(40)Ca的结合能和均方根半径的计算结果与实验符合得很好。同时... 详细信息

我们对有限核的相对论密度相关Hartree近似作了进一步的研究,其中相对论Hartree拉氏函数的耦合常数被构造成密度相关的,并且是从核物质的相对论B-H-F结果得到的。^(16)O和^(40)Ca的结合能和均方根半径的计算结果与实验符合得很好。同时,本文也计算出了来自于电子散射的电荷密度,并讨论了它们在有关核物质特性方面对于核子—核子相互作用的依赖性。

关键词： Hartree近似相对论密度相关有限核耦合常数核物质均方根半径核子结合能介子质量单粒子能量

Coupling between Superfluidity and Single-particle Energies in Nuclear Matter

在线全文

学校读者我要写书评

暂无评论

近代物理研究所和兰州重离子加速器实验室年报：英文版 2000年第1期 104-104页