A new alternative scheme to describe nuclei with X(5) symmetry

DAI Lianrong; CONG Meiling; LIU Ruling; DENG Xin; LIU Qi

doi:10.11889/j.0253-3219.2014.hjs.37.100505

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A new alternative scheme to describe nuclei with X(5) symmetry

更新时间：2021-03-03

- A new alternative scheme to describe nuclei with X(5) symmetry
- NUCLEAR TECHNIQUES Vol. 37, Issue 10, Article number: 100505(2014)
- 作者机构：
  
  辽宁师范大学物理系,大连,116029
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2014.hjs.37.100505
  CLC：
- Published：16 October 2014
- 稿件说明：
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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：

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.

摘要

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。

Abstract

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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