论文标题
三轴核中可能的中子光环42AL
Possible neutron halo in triaxial nucleus 42Al
论文作者
论文摘要
在连续体（TRHBC）中，同时考虑到三轴性和配对相关性以及连续性效应的显微镜自洽的三轴相对论Hartree-bogoliubov理论，并被确定并应用于探索新颖的halo现象中的新颖halo现象。实验质子滴注线以及中子分离能和电荷半径的可用数据可很好地再现，没有任何自由参数。到目前为止观察到的最富含中子的奇数铝同位素是42AL，预计将以beta = 0.35和伽马= 42的形式将其三重变形。与AME2020一致，它的单中性分离能预计为0.68 MeV，中子RMS半径为3.94 FM，大于经验值大。价中子的密度分布在空间上延伸的范围比核心延伸得多，这表明42al中可能的中子晕。费米能围绕的单中性轨道揭示了负责光晕空间扩展的主要成分。发现了一种新型现象，即三轴芯之间的中间轴和短轴与β= 0.38和伽马= 50的中间轴和短轴的交换，以及β= 0.79和伽马= -23的三轴光晕。高度要求探索光环现象和42AL中新型形状的未来实验。
A microscopic self-consistent triaxial relativistic Hartree-Bogoliubov theory in continuum (TRHBc), which simultaneously takes into account the triaxiality and pairing correlations as well as continuum effects, is established and applied to explore the novel halo phenomenon in aluminum isotopes. The experimental proton drip line and the available data of neutron separation energies and charge radii are reproduced well without any free parameters. The neutron-richest odd-odd aluminum isotope observed so far, 42Al, is predicted to be triaxially deformed with beta=0.35 and gamma=42. Its one-neutron separation energy is predicted to be 0.68 MeV, in agreement with the AME2020, and the neutron rms radius is 3.94 fm, remarkably larger than the empirical value. The density distribution of the valance neutron, which extends much farther in space than the core, suggests a possible neutron halo in 42Al. The dominant components responsible for the spatial extension of the halo are revealed by the single-neutron orbitals around the Fermi energy. A novel phenomenon, the exchange of the intermediate and short axes between the triaxial core with beta=0.38 and gamma=50, and the triaxial halo with beta=0.79 and gamma=-23, is found. Future experiments to explore the halo phenomenon and the novel shape decoupling in 42Al are highly demanded.
