Restoration of rotational symmetry in deformed relativistic mean-field theory

We report on a very recently developed three-dimensional angular momentum projected relativistic mean-field theory with point-coupling interaction (3DAMP+RMF-PC). Using this approach the same effective nucleon-nucleon interaction is adopted to describe both the single-particle and collective motions in nuclei. Collective states with good quantum angular momentum are built projecting out the intrinsic deformed meanfield states. Results for 24Mg are shown as an illustrative application.     

Deformation constrained relativistic mean-field approach with fixed configuration and time-odd component

Deformation constrained relativistic mean-field (RMF) approach with fixed configuration and timeodd component has been developed and applied to investigate magnetic moments of light nuclei near doublyclosed shells. Taking 17O as an example, the results and discussion are given in detail.     

Deformation constrained relativistic mean-field approach with fixed configuration and time-odd component

Deformation constrained relativistic mean-field (RMF) approach with fixed configuration and time-odd component has been developed and applied to investigate magnetic moments of light nuclei near doubly-closed shells. Taking ¹⁷O as an example, the results and discussion are given in detail.     

Chiral doublet bands and energy-level crossing

Different definitions for chiral doublet bands based on excitation energies, B(E2) and B(M1) respectively are discussed in the triaxial particle rotor model. For the ideal chiral geometry, the selection rules of the electromagnetic transitions in different band definitions are illustrated. It is also shown that the energy-level crossings between chiral doublet bands may occur.     

Solving the Dirac Equation with Nonlocal Potential by Imaginary Time Step Method

The imaginary time step （ITS） method is applied to solve the Dirac equation with the nonlocal potential in coordinate space by the ITS evolution for the corresponding Schrfdinger-like equation for the upper component. It is demonstrated that the ITS evolution can be equivalently performed for the Schrodinger-like equation with or without localization. The latter algorithm is recommended in the application for the reason of simplicity and efficiency. The feasibility and reliability of this algorithm are also illustrated by taking the nucleus ^16O as an example, where the same results as the shooting method for the Dirae equation with localized effective potentials are obtained.     

高催化效率钒酸铋可见光催化剂的制备及性能研究

采用水热合成法,以十二烷基苯磺酸钠(SDBS)作为表面活性剂实现对晶体形貌的调控,制备了高催化效率的棒状单斜相钒酸铋催化剂,通过对罗丹明B的催化降解和样品的测试表征,研究了十二烷基苯磺酸钠加入量对钒酸铋光催化性能和形貌的影响.加入十二烷基苯磺酸钠的质量分数0.08;时,制备得到BiVO4样品对罗丹明B的光催化降解效率达到最大.并对H2O2协同催化提高催化效率的机理进行了探讨.     

同核异能素百年回顾

同核异能素指原子核的长寿命激发态,通常发生γ跃迁、β衰变、裂变、α衰变、质子发射等衰变.原子核激发态的半衰期常不到1 ps.寿命多长才能被称为同核异能素并无统一界定.一般认为,为了能够计数,同核异能素的半衰期应该长于1 ns.同核异能素通常可以通过重核裂变、重离子反应、超强激光等方法产生.自同核异能素被发现以来的一个世...     

磷烯基二维范德瓦尔斯异质结的理论表征

本文基于单层黑磷和蓝磷,理论设计出二维范德瓦尔斯异质结、能带结构、态密度、Bader电荷布局、电荷密度差分图及光吸收谱等,计算结果表明它是典型的第二型异质结,有利于光生载流子分离,且可见光捕获能力显著增强.内禀的界面极化电场能有效阻止光生电子-空穴的复合.表明磷烯基二维范德瓦尔斯异质结是一类性能优异的光解水催化剂.     

原子核结构的相对论第一性原理研究

过去几十年中,原子核物理的相对论密度泛函理论得到很大发展,可以成功地描述各种原子核现象。文章阐述在相对论框架下研究原子核多体问题的必要性,介绍原子核物理中相对论密度泛函理论的基本概念,回顾相对论密度泛函理论在描述原子核基态、手征转动和动力学过程等方面的应用,讨论基于原子核物理的相对论第一性原理研究,即完全自洽的相对论Brueckner—Hartree—Fock理论,构建微观普适的密度泛函的基本思想。