论文标题
在适应对称性的框架中对靠背的新见解
New Insights into Backbending in the Symmetry-adapted Framework
论文作者
论文摘要
我们为对称性框架内的背叛现象提供了新的见解，该框架自然描述了原子核的内在变形。对于$^{20} \ text {ne} $，在光核中的背弯示例，从头开始对称对称性的无核壳模型表明，虽然能量光谱在刚性转子假设下从实验能量中复制了靠背，但在固有变形或固定旋转的旋转旋转旋转范围内没有变化。对于以经验相互作用计算的$^{48} \ text {cr} $的传统示例，我们确认了一个与先前模型一致的高自旋核，该核实际上是球形的。但是，我们发现，这种球形分布平均是由于变形的岩体形状与变形的扁平形状和三轴形状几乎相等的混合而产生的。微观计算证实了自旋比对和构型混合的重要性，但令人惊讶的是，惯性矩时没有异常的增加。这一发现为进一步理解中质核核的旋转行为和惯性矩开辟了道路。
We provide new insights into backbending phenomenon within the symmetry-adapted framework which naturally describes the intrinsic deformation of atomic nuclei. For $^{20}\text{Ne}$, the canonical example of backbending in light nuclei, the ab initio symmetry-adapted no-core shell model shows that while the energy spectrum replicates the backbending from experimental energies under the rigid rotor assumption, there is no change in the intrinsic deformation or intrinsic spin of the yrast band around the backbend. For the traditional example of $^{48}\text{Cr}$, computed in the valence shell with empirical interactions, we confirm a high-spin nucleus that is effectively 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 and triaxial 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.
