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核技术  2014 

一种新方式描述具有X(5)对称性的原子核

DOI: 10.11889/j.0253-3219.2014.hjs.37.100505, PP. 100505-100505

Keywords: 相互作用玻色子模型,量子相变,高阶项

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Abstract:

相互作用玻色子模型(Interactingbosonmodel,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。

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