检索结果-南通市图书馆

Alpha Decay Half-Lives of New Superheavy Elements through Quasimolecular Shapes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2006年第7期23卷 1734-1737页

作者：张鸿飞李君清左维陈宝秋马中玉 soojae im Royer Guy Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 Research Center of Nuclear Theory of Laboratory of Heavy Ion Accelerator of Lanzhou Lanzhou 730000 Graduate School of Chinese Academy of Sciences Beijing 100030 China Institute of Atomic Energy Beijing 102413 Laboratoire Subatech UMR: IN2P3/CNRS-Uniyersité-Ecole des Mines 4 rue A. Kastler 44307 Nantes Cedex 03 France

The lifetimes of a decays of the recently produced isotopes of the elements 112, 114, 116 and the element ^294118 and of some decay products have been calculated theoretically within the Wentzel-Kramers-Brillouin approximation. The a decay barriers have been determined in the quasimolecular shape path within a generalized liquid drop model including the proximity effects between nuclei in a neck, the mass and charge asymmetry and the precise nuclear radius. These calculations provide reasonable estimates for the observed a decay lifetimes. The calculated results have been compared with the results of the density-dependent M3Y effective interaction and the experimental data. It is indicated that the theoretical foundation of the generalized liquid drop model is as good as that of the microscopic DDM3Y model, at least in the sense of predicting the T1/2 values as long as one uses a correct a decay energy. The half lives of these new nuclei are well tested from the consistence of the macroscopic, the microscopic and the experimental data.

关键词： LIQUID-DROP MODEL DEFORMED POTENTIAL-ENERGY HEAVIEST ELEMENTS CREVICEDSHAPES NUCLEI EMISSION FISSION CA-48 BARRIER COMPACT

Theoretical Study on Properties of New Isotope 265Bh

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第4期45卷 681-686页

作者： ZHANG Hong-Fei ZUO Wei LI Jun-Qing soojae im MA Zhong-Yu CHEN Bao-Qju Institute of Modern Physics the Chinese Academy of Sciences Lanzhou 730000 China Graduate School of＇the Chinese Academy of Sciences Beijin 100049 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China Institut für Theoretische Physik Justus-Liebig-Universitaet Heinrich-Buff-Ring 16 D 35392 Giessen Germany China Institute of Atomic Energy Beijing 102413 China

The properties of nuclei belonging to the newly observed α-decay chain starting from ^265Bh have been studied. The axially deformed relativistic mean-field calculation with the force NL-Z2 has been performed in the blocked BCS approximation. Some ground state properties such as binding energies, deformations, spins, and parities, as well as Q-values of the a-decay for this decay chain have been calculated and compared with known experimentai data. Good agreement is found. The slngle-particle spectrum of the nucleus ^265Bh is studied and some new magic numbers are found, while the magnitudes of the shell gaps in superheavy nuclei are much smaller than those of nuclei before the actinium region, and the Fermi surfaces are close to the continuum. Thus the superheavy nuclei are usually not stable. The a-decay lifetimes in the ^265Bh decay chain are evaluated by different formulae, and compared with experimental data. The methods which give good agreement with the data are selected.

关键词： relativistic mean field superheavy nuclei binding energy lifetimes

维普期刊数据库

Single-particle Spectra of Superheavy Element ^(287)115 and Its α-decay Time

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 2004年第1期 27-27页

作者： soojae im

The single-particle spectra of nucleus 287115 have been studied. The axially deformed relativistic mean field calculation with the force NL-Z2 has been performed in the blocked BCS approximation. The spectra are calculated and shown in Fig.1 both for protons and neutrons. In the calculation, the quadrupole deformation is calculated to be β=0.159. The length of the solid horizontal lines represents the occupation number of

关键词：粒子谱超重元素变形计算时间衰变轴向变形细胞核相对论

Properties of Superheavy Element~ （287）115

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

imP & HIRFL Annual Report 2004年 47-47页

作者： soojae im

The properties of nuclei belonging to the newly observed α-decay chain starting from 287115 have been studied. The odd nucleus 287115 has been observed to decay through αemission and will most probably end to the existing nucleus 267105. The axially deformed relativistic mean field calculation with the force NL-Z2 has been performed. The deformation of nuclei is described by the oscillator expansion method. The major shell

关键词：

α-decay Properties of Newly Discovered Nucleus 288115 and Its Decay Chain in a Generalized Liquid-drop Model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

imP & HIRFL Annual Report 2004年 49-49页

作者： soojae im

The alpha decay properties of the nuclei belonging to the newly observed nuclei starting from 288115 have been studied with the WKB approximation. The macroscopic deformed potential energy for the alpha decay potentia...

关键词：

Single-particle Spectra of Superheavy Element 287115 and Its α-decay Time

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

imP & HIRFL Annual Report 2004年 48-48页

作者： soojae im

关键词：

Properties of Superheavy Element 287115

在线全文

同方期刊数据库

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 2004年第1期 26-26页

作者： soojae im

关键词：核性质超重元素轴向变形衰变链相对论平均场展开法振荡器

Skyrme-Hartree-Fock方法对Ca同位素基态性质的研究 (Ⅰ)结合能、壳结构、半径与密度分布

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

高能物理与核物理 2001年第5期25卷 322-328页

作者：任秀宰孟杰周善贵杨泗春龙文辉北京大学技术物理系和重离子物理所兰州重离子加速器国家实验室原子核理论中心兰州730000 中国科学院理论物理研究所北京100080

用Skyrme Hartree Fock模型系统地研究了40 Ca到70 Ca到Ca同位素偶偶核的基态性质及其同位旋依赖性 .讨论了结合能、均方根半径、密度分布随同位旋的变化 ,研究了壳效应对结合能、双中子分离能S2n及和表面弥散厚度的影响 .结果表明壳效... 详细信息

用Skyrme Hartree Fock模型系统地研究了40 Ca到70 Ca到Ca同位素偶偶核的基态性质及其同位旋依赖性 .讨论了结合能、均方根半径、密度分布随同位旋的变化 ,研究了壳效应对结合能、双中子分离能S2n及和表面弥散厚度的影响 .结果表明壳效应在S2n、表面弥散厚度中表现得非常明显 .质子均方根半径Rrms随相对中子数I=(N -Z) /A的变化满足Rrms=35(1 +αI + βI2 )rpZ1/ 3.离心位垒对核表面以外的密度分布有很大影响 .

关键词： Skyrme-Hartree-Fock模型不稳定核结合能核半径密度分布钙同位素基态性质壳结构效应放射性核束远离稳定线原子核

维普期刊数据库

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

相对论平均场理论对Pb同位素位移的研究

高能物理与核物理 2006年第8期30卷 745-749页

作者：张鸿飞左维李君清任秀宰马中玉陈宝秋中国科学院近代物理研究所兰州重离子加速器国家实验室原子核理论中心

运用变形的相对论平均场理论研究了Pb同位素链的基态性质．对关联的处理采用了BCS方法,不成对核子的处理运用了“阻塞”法．计算的结果很好地符合了实验上Pb的平均结合能,中子分离能,同位素位移．接着从原子核的微观结构出发,比较详细... 详细信息

运用变形的相对论平均场理论研究了Pb同位素链的基态性质．对关联的处理采用了BCS方法,不成对核子的处理运用了“阻塞”法．计算的结果很好地符合了实验上Pb的平均结合能,中子分离能,同位素位移．接着从原子核的微观结构出发,比较详细地研究了Pb链同位素位移出现反常扭折这一重要性质的物理机制．

关键词：同位素位移相对论平均场结合能单粒子能级

维普期刊数据库