A～190区偶偶核超形变晕带能谱的微观计算  

MICROSCOPIC CALCULATIONS OF THE YRAST SUPERDEFORMED BANDS OF THE EVEN EVEN NUCLEI IN THE A～190 MASS REGION

作　　者：周善贵[1] 郑春开[1] 许甫荣[1] 胡济民[1] 

机构地区：[1]北京大学技术物理系

出　　处：《青岛大学学报（自然科学版）》1997年第2期8-9,共2页Journal of Qingdao University(Natural Science Edition)

摘　　要：利用推转玻尔－莫特逊哈密顿量对Ａ～１９０区超形变核的研究表明［１～４］，由拟合超形变带能谱得到的与核的内部结构密切相关的参数，质量参量Ｂ１和硬度参量Ｃ０有明显的奇偶性．为验证这些规律，我们从Ｎｉｌｓｏｎ单粒子能级出发，用推转模型和ＢＣＳ方法，首先计算了该区偶偶核超形变态质量参量Ｂ０，Ｂ１和Ｂ２，同时利用有限力程模型和微观修正方法计算了超形变态下的硬度参量Ｃ０，并进而由这些参数（经过合理调整）计算了偶偶核超形变晕带的自旋和能谱，得到的结果与实验基本符合．Clear odd even effects of the mass parameter B 1 and the rigidity parameter C 0 have been shown in the studies of the superdeformed nuclei in the A～190 mass region with the cranking Bohr Mottelson Hamiltonian. Since both B 1 and C 0 have clear physical meanings, as the first step of the further study, we calculate, at the superdeformations, the mass parameters B 0, B 1, and B 2 by using the cranking model, the BCS method and the Nilsson model and the rigidity parameter C 0 by using the finite range liquid drop model and the microscopic corrections for the even even nuclei in this region. From the calculated parameters (under reasonable adjustments), we get satisfactory level spins and spectra of the yrast superdeformed bands of the studied nuclei.

关 键 词：推转模型 超形变 能谱 质量参量 核结构 偶偶核 

分 类 号：O571.21[理学—粒子物理与原子核物理]