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首页> 外文期刊>Physical review, C >Structural evolution in germanium and selenium nuclei within the mapped interacting boson model based on the Gogny energy density functional
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Structural evolution in germanium and selenium nuclei within the mapped interacting boson model based on the Gogny energy density functional

机译：基于GOGNY能量密度函数的映射交互玻色子模型中锗和硒核的结构演变

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摘要

The shape transitions and shape coexistence in the Ge and Se isotopes are studied within the interacting boson model (IBM) with the microscopic input from a self-consistent mean-field calculation based on the Gogny-D1M energy density functional. The mean-field energy surface as a function of the quadrupole shape variables beta and gamma, obtained from the constrained Hartree-Fock-Bogoliubov method, is mapped onto the expectation value of the IBM Hamiltonian with configuration mixing in the boson condensate state. The resultant Hamiltonian is used to compute excitation energies and electromagnetic properties of the selected nuclei Ge66-94 and Se68-96. Our calculation suggests that many nuclei exhibit gamma softness. Coexistence between prolate and oblate shapes, as well as between spherical and gamma-soft shapes, is also observed. The method provides a reasonable description of the observed systematics of the excitation energy of the low-lying energy levels and transition strengths for nuclei below the neutron shell closure N = 50, and provides predictions on the spectroscopy of neutron-rich Ge and Se isotopes with 52 <= N <= 62, where data are scarce or not available.
机译：在基于Gogny-D1M能量密度函数的自我常见的平均场计算中，在与自我一致平均场计算中的微观输入中研究了Ge和Se同位素中的形状转变和形状共存。从受约束的Hartree-Fock-Bogoliubov方法获得的四极形状变量β和伽马的平均场能表面被映射到IBM Hamiltonian的预期值，在玻色子缩合状态下的配置混合。所得汉密尔顿人用于计算所选核GE66-94和SE68-96的激励能量和电磁特性。我们的计算表明许多核表现出γ柔软性。还观察到与球形和扁平形状之间的共存，以及球形和伽马软形状。该方法提供了对低位能量水平的激发能量的理由描述，以及中子壳闭合下方核的核的过渡强度，并提供对富中子GE和SE同位素的光谱的预测52 <= n <= 62，其中数据稀缺或不可用。

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