锆同位素核结构的理论研究_毕业论文

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锆同位素核结构的理论研究

摘要本文采用推转壳模型研究高自旋态下的锆的同位素偶偶核的结构特性,我们用Woods-Saxon势来描述核子的势场,并且进一步引入了对关联同时结合Strutinsky方法,然后得到Total Routhian Surface (TRS)。我们利用这一模型计算了N=30到N=84的锆的同位素偶偶核在不同转动频率下的TRS,随后分析各个原子核的形变、转动带、转动惯量来更加深入的了解原子核的结构。我们还研究了锆同位素N=30到N=84的基态时的结构性质,并且研究了他们在高自旋态下的性质。计算结果表明当N≤40时,锆同位素为大形变的长椭球形状,β2~0.4此时还存在扁椭球的第二极小点,但该极小点的能量与基态差别较大。随着中子数的继续增加,锆同位素的形状由近球形核发展为长椭球形变进而演变为三轴形变核,最终由于N=82幻数壳的影响变为形变核。在推转计算中,我们着重研究了70Zr30,80Zr40,82Zr42,108Zr68,120Zr80核的特点,发现70Zr30随着 的增加,转动惯量与刚体转动类似,此外,还发现了在N=40时,当转动频率 大于一定值时候,核的形状发生突变,会由长椭球形变演变为扁椭球形变核。64560

关键词: 推转壳模型  锆同位素 核结构

毕业论文 外 文 摘 要

Title    Strucuture Investigations Of Zirconium Isotopes                  

Abstract The major content in this dissertation is the research of structure properties on the high spin states of Zirconium even-even isotopes by using Cranked shell model,meanwhile,we apply Woods-Saxon potential energy to describe potential field,and further introduce Strutinsky method in association with correlations to modify Cranked shell mode to achieve Total Routhian Surface (TRS).We make use of the model to calculate the TRS in different rotational frequencies of Zirconium even-even isotopes, the neutron number of which is from 30 to 84.Whereafter,The nuclear deformation, dynamic band ,dynamic moment of inertia is investigated to learn more about the structure of atomic nucleus. The investigations of the values of Zincronium isotopes in ground state has been made , the neutron number of which is from 30 to 84,and the nuclear deformation, then we focus on the structure properties of  70Zr30,80Zr40,82Zr42,108Zr68,120Zr80.With the increasing of , 70Zr30 happen to the dynamic moment of inertia is similar with rotation of rigid body. Besides, Atomic nucleus, neutron number equal to 40, appear the prolate spheroid at high value of   when   reach greater than a certain value. 

 Keywords: Cranked shell model;Zirconium Isotopes;nuclear structure

目  录

第一章 前言 1

第二章 理论模型 2

2.1原子核形状的数学描述 2

2.2原子核的四极形变 5

2.3 壳模型和形变壳模型 7

2.4 推转壳模型 10

2.5对力与对关联的影响 13

2.6 Woods-Saxon 势 14

2.7 Strutinsky 壳层修正 15

2.8 TRS计算 16

2.9转动惯量核回弯现象 17

第三章 结果与讨论 19

3.1 理论计算细节 19

3.2 计算与结果 20

致  谢 36

参考文献 36

第一章 前言 (责任编辑:qin)