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辽宁师范大学 物理系,大连,116029
[ "通讯作者: 戴连荣,女,1968年出生,1996年于中国科学院高能物理研究所获博士学位,现从事核结构和中高能核物理研究 E-mail:dailr@lnnu.edu.cn" ]
纸质出版日期:2014-10-16
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戴连荣, 丛美玲, 刘入菱, 等. 一种新方式描述具有X(5)对称性的原子核[J]. 核技术, 2014,37(10):100505
DAI Lianrong, CONG Meiling, LIU Ruling, et al. A new alternative scheme to describe nuclei with X(5) symmetry[J]. Nuclear techniques, 2014, 37(10): 100505
戴连荣, 丛美玲, 刘入菱, 等. 一种新方式描述具有X(5)对称性的原子核[J]. 核技术, 2014,37(10):100505 DOI: 10.11889/j.0253-3219.2014.hjs.37.100505.
DAI Lianrong, CONG Meiling, LIU Ruling, et al. A new alternative scheme to describe nuclei with X(5) symmetry[J]. Nuclear techniques, 2014, 37(10): 100505 DOI: 10.11889/j.0253-3219.2014.hjs.37.100505.
相互作用玻色子模型(Interacting boson model
IBM)是一个代数模型,它能很好地描述原子核的集体运动性质。由于IBM中玻色子数守恒及有可解析解,因而能方便地研究原子核过渡区的行为。本文在IBM模型中引入了一种新的方案,即用O(6)高阶项替代传统方案的SU(3)四极-四极相互作用来描述轴对称转动核。在此基础上,对过渡区具有X(5)对称性的原子核的量子相变现象进行了系统的研究。分别在两种方案下,研究了原子核154Gd和98Sr低激发态的能谱和电磁跃迁性质。结果表明,采用新的O(6)高阶项相互作用可以更好地描述实验结果,特别是描述不同带之间的带间跃迁性质。
Background: Quantum phase transition is of great interest in many areas of physics. Purpose: In this work
a new scheme is applied to describe the transitional nuclei with X(5) symmetry
from spherical to axially deformed shape-phase transition. Methods: In this new scheme
the usual SU(3) quadrupole-quadrupole interaction is replaced by an O(6) cubic interaction in the Interacting boson model (IBM). Results: The two X(5) candidates 154Gd and 98Sr nuclei are firstly investigated. The low-lying energy levels and E2 transition rates are calculated and compared with the experimental data. Conclusion: The results show that the new scheme can reasonably describe the experimental low-lying spectrum and the intraband and the interband E2 transitions. The present work is meaningful in understanding the new characteristics of symmetry by the higher order O(6) cubic interaction. Abstract
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