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Global description of beta(-) decay in even-even nuclei with the axially-deformed Skyrme finite-amplitude method

机译:β( - )脱敏在均匀核细胞中的全局描述与轴向变形的Skyrme有限幅度法

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摘要

We use the finite-amplitude method for computing charge-changing Skyrme-quasiparticle random-phase approximation (QRPA) transition strengths in axially-deformed nuclei together with a modern Skyrme energy-density functional to fit several previously unconstrained parameters in the charge-changing time-odd part of the functional. With the modified functional we then calculate rates of beta(-) decay for all medium-mass and heavy even-even nuclei between the valley of stability and the neutron drip line. We fit the Skyrme parameters to a limited set of beta(-) decay rates, a set of Gamow-Teller resonance energies, and a set of spin-dipole resonance energies, in both spherical and deformed nuclei. Comparison to available experimental beta(-) decay rates shows agreement at roughly the same level as in other global QRPA calculations. We estimate the uncertainty in our rates all the way to the neutron drip line through a construction that extrapolates the errors of known beta(-) decay rates in nuclei with intermediate Q values to less stable isotopes with higher Q values.
机译:我们使用有限幅度方法来计算轴向变形核中的电荷改变的斯基尔Quasiparticle随机相近似(QRPA)过渡强度,与现代的Skyrme能量密度官能团,以在电荷变化的时间内适合几个先前未受约束的参数 - 功能的一部分。随着修饰的功能,我们计算稳定性和中子滴管谷之间的所有中等质量和重度均匀核的β( - )衰减的速率。我们将Skyrme参数适用于有限的Beta( - )衰减率,一组Gamow-Talker谐振能量,以及一组球形和变形核。与可用的实验测试版( - )衰减率的比较显示在其他全球QRPA计算中大致相同的级别。我们通过将中间Q值推断到核中的已知β( - )衰减率的误差,以将中间Q值推断到更高的Q值的稳定同位素的结构来估计远离中子滴管的不确定性。

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