基于双核模型的粒子交换势能面与熔合几率的研究(英文)

研究了基于双核模型的粒子交换势能面.原子核的形变效应对于势能面的形状有较大的影响.在反应过程中,作为反应时间函数的动态形变的变化是显著的.通过求解主方程,对一些基于冷熔合机制的反应道的全熔合几率也进行了讨论. The Potential Energy Surface (PES) for particle exchange in Di nuclear system is studied in detail. It is found that the nuclear deformation effect can change the shape of PES significantly. The dynamical deformation as a function of the reaction time in the reaction process is investigated in a simple model and we found that its variation with time is dramatic. The fusion probabilities P-CN of some reaction channels based on the mechanism of cold fusion are also calculated.     

K^- Condensation in Neutron Star Matter with △ Quartet

In the framework of relativistic mean field theory, the condensations of K^- and K^0 in neutron star matter including baryon octet and △ quartet are studied. We find that in this case K^- and K^0 condensations can occur at relative shallow optical potential depth of K^ from -80 MeV to -160 MeV. Both K^- and K^0 condensations favor the appearances of △ resonances. With K^- condensations all the △ quartet can appear well inside the maximum mass stars. The appearances of △ resonances change the composition and distribution of particles at high densities. The populations of △ resonances can enhance K^- condensation. It is found that in the core of massive neutron stars, neutron star matter includes rich particle species, such as antikaons, baryon octet, and △ quartet. In the presence of △ resonances and K^- condensation, the EOS becomes softer and results in smaller maximum mass stars. Furthermore the impact of antikaon condensations, hyperons, and △ resonances on direct Urca process with nucleons is also discussed briefly.     

通过48Ca+249Bk 合成Z=117的可能性研究

利用两步模型对可能合成 Z=117 的核反应48Ca+249Bk 进行了研究。模型将熔合过程分为弹靶接触前的粘连过程和从弹靶接触到形成复合核的形成过程。结合统计蒸发模型,计算了297117 蒸发数个中子的剩余截面。结果表明,在激发能 E* = 31 MeV且复合核蒸发3中子时的剩余截面最大为 0.34 pb ,已经可以用实验方法进行探测。     

α粒子模型下的π--12C散射

本文应用独立α粒子模型波函数,在Glauber理论下,计算了共振区内一系列能量（T_π=-120、150、180、220、260MeV）下的π^--¹²C弹性散射微分截面。理论与实验结果较好地符合。在截面对于波函数敏感的低能区域,本文结果比前人同类结果有明显改进。     

超重核性质与合成机制的理论研究

探索原子核的电荷与质量极限,合成长寿命超重核是当前原子核物理研究的重要前沿问题之一。本文综述了我们近几年在超重原子核结构性质与合成机制方面取得的理论研究进展。在结构性质方面,利用处理对关联的粒子数守恒方法,基于推转壳模型,系统研究了锕系核与超镄核低激发谱,发展了多维形状约束的协变密度泛函理论并用于研究锕系核势能面和裂变位垒以及N=150同中子素中的非轴对称八极关联等。在超重核合成机制方面,系统研究了利用重离子熔合反应合成超重核的三步过程,包括俘获过程——提出了一个位垒穿透概率新公式、熔合过程——提出了一个基于动力学形变势能面的双核模型、存活过程——系统研究了激发态超重复合核存活概率等。系统研究了合成超重核的热熔合反应,得到的熔合蒸发截面与实验符合,并预言了合成119和120号超重元素的生成截面。     

奇异强子物质中的△自由度的影响

用相对论平均场方法研究了△自由度对奇异强子物质的影响,结果发现考虑△自由度后奇异强子物质在较高密度区出现第二个稳定态,同时通过反应ΛΛ-ΞN促进Ξ超子的产生．     

奇异强子物质中的Δ自由度的影响

用相对论平均场方法研究了西自由度对奇异强子物质的影响,结果发现考虑上自由度后奇异强子物质在较高密度区出现第二个稳定态,同时通过反应AA–ΞN促进Ξ超子的产生.     

ψ′在介质中的轻子衰变和辐射跃迁

在夸克势模型的框架下,用屏蔽质量与介质温度和密度的关系,研究了ψ′在热力学介质中的轻子衰变和辐射跃迁.     

动力学U(36/24)超对称性在轻核的表现

在U(36/24)超对称模型下,讨论了s-d壳核³⁰P,³⁰³¹P,³¹Si的低激发能谱,所得结果表明,在轻核中有可能存在动力学超对称性.     

Spherical and Deformed Shell Closures in Superheavy nuclei

The structure of superheavy nuclei has been studied using the macroscopic-microscopic model. The macroscopic energy was calculated with the continuous medium model in which the energy is expressed as a function of nucleon densities. The deformations and structures of superheavy nuclei were systematically investigated. Calculations reproduce well the available data of experimental α-decay energies and half-lives. The investigation of single-particle levels shows that the shell structure is deformation and isospin dependent. Potential-energy-surface calculations display that superheavy nuclei have in general harder shapes than the nuclei of other mass regions.