$^{254}$No中M1剪刀模态的微观分析
Microscopic analysis of M1 scissors mode in $^{254}$No
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- Joint Institute for Nuclear Research（俄罗斯联合核研究所）
- Dubna State University（杜布纳国立大学）
- Institute of Physics, Slovak Academy of Sciences（斯洛伐克科学院物理研究所）
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中文总结 AI 辅助
本文在自洽QRPA框架下用Skyrme力分析$^{254}$No的M1剪刀模态，预测其精细结构，发现轨道与自旋翻转贡献相长干涉，并质疑传统剪刀流图像。
中文摘要 AI 辅助
最近，奥斯陆小组在变形核$^{254}$No中观测到了低能$M1$轨道剪刀模态（SM）。这是迄今实验上发现SM的最重核。我们提出在完全自洽的准粒子随机相位近似（QRPA）框架下，结合Skyrme力SG2、SLy4和SLy5，对SM以及自旋翻转$M1$共振进行分析。我们分析了通过微扰方式（基于SG2）和自洽方式（SLy5）引入的“张量”$J^2$项的影响，结果表明该影响显著但并非决定性。我们检查了形变引起的$M1$和$E2$态耦合。计算结果合理地描述了奥斯陆小组的实验数据，其中SLy5给出的结果与实验符合最佳。我们预测了$^{254}$No中SM的精细结构。在SM能量区域，发现主导的轨道贡献与次要的自旋翻转贡献对$M1$强度存在显著的相长干涉。值得注意的是，我们对对流核电流分布的分析挑战了通常假设的SM剪刀状流动。
英文摘要
The low-energy $M1$ orbital scissors mode (SM) was recently observed by Oslo group in deformed nucleus $^{254}$No. This is the heaviest nucleus where SM was ever experimentally found. We propose the analysis of SM, together with the spin-flip $M1$ resonance, within fully self-consistent Quasiparticle Random-Phase Approximation (QRPA) with Skyrme forces SG2, SLy4 and SLy5. The impact of "tensor" $J^2$-term, introduced by perturbative (on the base of SG2) and consistent (SLy5) ways, is analyzed and shown to be noticeable but not decisive. The deformation-induced coupling of $M1$ and $E2$ states is inspected. The calculations reasonably describe Oslo's experimental data. The best agreement is obtained for SLy5. A fine structure of SM in $^{254}$No is predicted. A significant constructive interference of the dominant orbital and minor spin-flip contributions to $M1$ strength at SM energy region is found. What is remarkable, our analysis of distributions of the convective nuclear currents challenges the scissors-like flow usually assumed for SM.
