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arXiv 1507.04686nucl-th
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丰中子Mo和Ru核三轴形状的理论研究

Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei

Chunli Zhang, Gowhar Bhat, Witek Nazarewicz, Javid Sheikh, Yue Shi

摘要:

背景资料:最近,测量了钼核和钌核的均匀质量丰中子同位素转动带的跃迁四极矩。新的数据提供了一个挑战的理论描述调用稳定的三轴变形。目的:为了理解丰中子Mo-Ru区转动带的实验数据,我们利用自洽平均场和壳层模型技术对$^{110}$ Ru周围丰中子偶偶核的转动惯量、形状和跃迁四极矩进行了理论分析.研究方法:为了描述钼和钌同位素的结构,我们使用核密度泛函理论(DFT)与优化的能量密度功能UNEDF 0。我们还应用三轴投影壳模型(TPSM)来描述Yrast和正宇称、近Yrast能带结构。结果如下:我们的自洽DFT计算预测三轴基态变形$^{106,108}$ Mo和$^{108.110,112}$ Ru和再现所观察到的低频行为的惯性矩。随着旋转频率的增加,与排列的$ν(h_{11/2})^2$对相关的负- $γ$结构在能量上变得有利.计算得到的跃迁四极矩随角动量的变化反映了形变随转动的变化,与实验结果一致。TPSM计算解释了所观察到的能带结构假设稳定的三轴形状。结论:$^{110}$ Ru周围丰中子偶偶核的结构符合三轴形变。我们的DFT和TPSM框架提供了一个一致的和互补的描述实验数据。

英文摘要:

Background: Recently, transition quadrupole moments in rotational bands of even-mass neutron-rich isotopes of molybdenum and ruthenium nuclei have been measured. The new data have provided a challenge for theoretical descriptions invoking stable triaxial deformations. Purpose: To understand experimental data on rotational bands in the neutron-rich Mo-Ru region, we carried out theoretical analysis of moments of inertia, shapes, and transition quadrupole moments of neutron-rich even-even nuclei around $^{110}$Ru using self-consistent mean-field and shell model techniques. Methods: To describe yrast structures in Mo and Ru isotopes, we use nuclear Density Functional Theory (DFT) with the optimized energy density functional UNEDF0. We also apply Triaxial Projected Shell Model (TPSM) to describe yrast and positive-parity, near-yrast band structures. Results: Our self-consistent DFT calculations predict triaxial ground-state deformations in $^{106,108}$Mo and $^{108.110,112}$Ru and reproduce the observed low-frequency behavior of moments of inertia. As the rotational frequency increases, a negative-$γ$ structure, associated with the aligned $ν(h_{11/2})^2$ pair, becomes energetically favored. The computed transition quadrupole moments vary with angular momentum, which reflects deformation changes with rotation; those variations are consistent with experiment. The TPSM calculations explain the observed band structures assuming stable triaxial shapes. Conclusions: The structure of neutron-rich even-even nuclei around $^{110}$Ru is consistent with triaxial shape deformations. Our DFT and TPSM frameworks provide a consistent and complementary description of experimental data.

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