New insights into backbending in the symmetry-adapted shell-model framework

New insights into backbending in the symmetry-adapted shell-model framework
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对对称适应壳模型框架中后弯的新见解

DOI:
10.1103/physrevc.108.024304
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发表时间:
2023
期刊:
影响因子:
3.1
通讯作者:
Draayer, Jerry P.
Draayer, Jerry P.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Heller, Nicholas D.;Sargsyan, Grigor H.;Launey, Kristina D.;Johnson, Calvin W.;Dytrych, Tomáš;Draayer, Jerry P.

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我们提供了深入了解的回弯现象内的自适应的框架,自然描述了原子核的内在变形。对于轻核回弯的典型例子,从头算适应的无核壳模型表明,虽然能谱在转子模型假设下从实验能量复制回弯,但回弯周围的yraast带的内禀形变或内禀自旋没有变化。对于传统的例子,计算的经验相互作用的价壳层,我们确认一个高自旋核,有效地接近球形,与以前的模型。然而,我们发现,这种球形分布的结果,平均而言,从几乎相等的变形扁长形状与变形扁圆形状的混合。微观计算证实了自旋排列和构型混合的重要性,但令人惊讶的是,没有发现惯性矩的异常增加。这一发现为进一步理解中等质量原子核的转动行为和转动惯量开辟了道路。
We provide insights into the backbending phenomenon within the symmetry-adapted framework which naturally describes the intrinsic deformation of atomic nuclei. For, the canonical example of backbending in light nuclei, theab initiosymmetry-adapted no-core shell model shows that while the energy spectrum replicates the backbending from experimental energies under the rotor-model assumption, there is no change in the intrinsic deformation or intrinsic spin of the yrast band around the backbend. For the traditional example of, computed in the valence shell with empirical interactions, we confirm a high-spin nucleus that is effectively near-spherical, in agreement with previous models. However, we find that this spherical distribution results, on average, from an almost equal mixing of deformed prolate shapes with deformed oblate shapes. Microscopic calculations confirm the importance of spin alignment and configuration mixing, but surprisingly unveil no anomalous increase in moment of inertia. This finding opens the path toward further understanding the rotational behavior and moment of inertia of medium-mass nuclei.
关于 SU(3) 重耦合系数的注释
DOI: --
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