$^{21}$B共振态的结构与衰变
Structure and decay of $^{21}$B resonances
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中文总结 AI 辅助
基于三体模型和超球形绝热展开方法，研究$^{21}$B共振结构，预测低能$\frac{3}{2}^-$态，解释实验共振为第二$\frac{3}{2}^-$态。
中文摘要 AI 辅助
在由$^{19}$B核心和两个中子组成的三体模型中，研究了富中子核$^{21}$B的结构。利用超球形绝热展开方法结合复标度技术计算了三体波函数。考虑了与$^{20}$B现有实验信息相容的四种势参数化方案。计算预测在实验观测到的2.47 MeV共振态下方存在一个低能的$\frac{3}{2}^-$态。对三体相互作用依赖性的分析表明，该态不能被移动到实验共振能量；相反，它要么保持束缚态，要么成为宽度迅速增大的近阈值共振。这些结果表明，观测到的共振更自然地解释为第二个$\frac{3}{2}^-$态，而由$s_{1/2}$组态主导的较低$\frac{3}{2}^-$态迄今尚未被实验观测到。对实验观测到的共振态获得了动量关联。此外，还研究了其他共振态的存在性。
英文摘要
The structure of the neutron-rich nucleus $^{21}$B is investigated within a three-body model consisting of a $^{19}$B core and two neutrons. The three-body wave functions are computed using the hyperspherical adiabatic expansion method combined with the complex-scaling technique. Four potential parametrizations compatible with the available experimental information on $^{20}$B are considered. The calculations predict a low-lying $\frac{3}{2}^-$ state below the experimentally observed resonance at 2.47~MeV. An analysis of the dependence on the three-body interaction shows that this state cannot be shifted to the experimental resonance energy; instead, it remains either bound or becomes a near-threshold resonance with a rapidly increasing width. These results indicate that the observed resonance is more naturally interpreted as the second $\frac{3}{2}^-$ state, whereas a lower-lying $\frac{3}{2}^-$ state, dominated by an $s_{1/2}$ configuration, has so far eluded experimental observation. Momentum correlations are obtained for the experimentally observed resonance. In addition, the existence of other resonances is investigated.
发表机构
- ETSAM, Universidad Politécnica de Madrid（马德里理工大学ETSAM学院）
- Instituto de Estructura de la Materia, IEM-CSIC（CSIC物质结构研究所）
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