The shape evolution in the neutron-deficient Hg region is investigated within the covariant density functional framework. We study in detail the chain of even–even mercury isotopes ^190−200Hg using the relativistic point coupling model. The low-energy excitation spectrum and the B(E2) transitions rates of even–even nuclei are obtained as solutions of a five-dimensional collective Hamiltonian (5DCH) model, with parameters determined by constrained self-consistent mean-field calculations based on the relativistic energy density functional DD-PC1, and a finite-range pairing interaction. The calculations suggest a very interesting structure evolution with coexisting configurations for ¹⁹⁰Hg, increased collectivity for the isotopes ^192−198Hg and a more spherical structure for ²⁰⁰Hg.

中文翻译：

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协变密度泛函理论中汞同位素的形状演化

在协变密度泛函框架内研究了缺中子 Hg 区域的形状演化。我们使用相对论点耦合模型详细研究了偶数汞同位素^{190-200 Hg 的链。}获得偶数核的低能激发谱和 B(E2) 跃迁率作为五维集体哈密顿量 (5DCH) 模型的解，其参数由基于约束的自洽平均场计算确定相对论能量密度泛函 DD-PC1，以及有限范围的配对相互作用。计算表明一个非常有趣的结构演变与^{190 Hg 的共存构型，同位素192-198}的集体增加Hg 和²⁰⁰ Hg 的球形结构。