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首页> 外文期刊>Physical review, C >Quadrupole collectivity and shell closure in neutron-rich nuclei near N=126
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Quadrupole collectivity and shell closure in neutron-rich nuclei near N=126

机译：在n = 126附近中子核核中的四极谱和壳闭合

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摘要

We present a comprehensive study on the low-lying states of neutron-rich Er, Yb, Hf, and W isotopes across the N = 126 shell with a multireference covariant density functional theory. Beyond-mean-field effects from shape mixing and symmetry restoration on the observables that are relevant for understanding quadrupole collectivity and underlying shell structure are investigated. The general features of low-lying states in closed-shell nuclei are retained in these four isotopes around N = 126, even though the shell gap is overall quenched by about 30% with the beyond-mean-field effects. These effects are consistent with the previous generator-coordinate calculations based on Gogny forces, but much smaller than that predicted by the collective Hamiltonian calculation. It implies that the beyond-mean-field effects on the r-process abundances before the third peak at A approximate to 195 might be more moderate than that reported by Arcones and Bertsch [Phys. Rev. Lett. 108, 151101 (2012)].
机译：我们对N = 126个壳体的中子富含ER，YB，HF和W同位素的低洼状态进行了全面的研究，具有多力度协调密度泛函理论。 研究了从形状混合和对称恢复对与理解四极其集体和底层壳结构相关的可观察到的对称性恢复。 闭合壳细胞核中的低洼状态的一般特征在n = 126周围保留在这四个同位素中，即使壳间隙的总体淬火约30％，具有超越平均场效应。 这些效果与基于Gogny力的先前的发电机坐标计算一致，但远远小于集体哈密顿计算所预测的那么小。 它意味着它意味着在近似到195之前的第三峰之前的R-Process丰度对R-Process丰富的影响可能比Quarks和Bertsch [Phys。 rev. lett。 108,151101（2012）]。

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