^(128)Xe核三轴形变的投影壳模型描述  

The description of the triaxial deformation in ^(128)Xe by triaxial projected shell model

作　　者：周爽[1] 图雅[1] 

机构地区：[1]沈阳师范大学物理科学与技术学院,沈阳110034

出　　处：《沈阳师范大学学报（自然科学版）》2015年第2期245-248,共4页Journal of Shenyang Normal University:Natural Science Edition

基　　金：国家自然科学基金青年基金资助项目(11301508)

摘　　要：三轴投影壳模型是一种完全量子化的理论,它对高速转动核态的描述是量子力学描述,而推转壳模型是半经典的。前者描述核形变随角动量的变化,而后者描述核形变随转动频率的变化。尤其对三轴形变核转动,推转壳模型中关于绕一个固定主轴转动的假设是不合理的,而三轴投影壳模型是壳模型的描述,没有固定轴。A-130区是个典型的三轴形变区。通过该区原子核的三轴投影壳模型描述可以检验该方法在描述三轴形变核的合理性。采用三轴投影壳模型(TPSM)研究了典型三轴形变核128 Xe转动带结构。当γ=29°时,计算很好地再现了真空态下的基带及其γ带,表明该核确实是个典型的三轴形变核。在相同的计算参数下,组态混合下的计算也很好地再现了Yrast带,进一步分析波函数,发现该核中h11/2轨道上的2个中子比2个质子首先破对。Triaxial projected shell model is a fully quantum theory, describing the rapidly rotating nuclei is a quantum- mechanical one, and can give the nuclear shape changes with the angular momentum, while the CSM method describes the nuclear shape varying with the rotational frequency, which is semi-classical. Especially for the rotation of a triaxial nucleus, the asuumption that the rotation is round a fixed axis in CSM is unreasonable. However, TPSM method is based on the shell model where there is no concept about the fixed rotational axis. A-130 mass region is typical triaxial deformed nuclear region. We can examine the rationality of the TPSM in describing triaxial deformed nuceus by studying the nucleus of the A-130 mass region. We have studied the rotational band structure of typical triaxial deformed nucleus 128Xe by using triaxial projected shell model. The ground state band and its 7 band can be reproduced with γ=29° at the vacumn state calculation indicating the nucleus 128 Xe is a typical triaxial deformed nucleus. By using the same calculation parameters,the present calculation also reproduced the Yrast band at the configuration mixing calculation and further analysis about wave function indicating the two neutrons are first breaking than the two protons in h11/2 orbital.

关 键 词：投影壳模型 三轴形变 模型描述 推转壳模型 计算参数 Yrast带 转动带结构 形变核 

分 类 号：O571[理学—粒子物理与原子核物理]