Moments of inertia of triaxial nuclei in covariant density functional theory

分类： 核科学技术 >> 辐射物理与技术 提交时间： 2024-07-30

Wang, Yumeng Chen, Qibo

摘要： The covariant density functional theory (CDFT) and five-dimensionalcollective Hamiltonian (5DCH) are used to analyze the experimentaldeformation parameters and moments of inertia (MoIs) of 12 triaxialnuclei extracted by Allmond and Wood [J. M. Allmond and J. L. Wood,\href{https://doi.org/10.1016/j.physletb.2017.01.072}{Phys. Lett. B \textbf{767},226 (2017)}]. It is found that the CDFT MoIs are generally smaller thanexperimental values but show qualitative consistency with irrotationalflow and experimental data for the relative MoIs, supporting that theintermediate axis has the largest MoI. It is furtherfound that the collapse of pairing interaction can lead to the nucleibehave like a rigid-body flow as exhibited in the casesof \ce{^{186-192}Os}}. In addition, by incorporating enhancedCDFT MoIs (a factor of $f\approx 1.55$) into 5DCH,the experimental low-lying energy spectra and deformation parametersare reproduced successfully. When contrasted with both the CDFT andthe triaxial rotor model (TRM), the 5DCH demonstrates superioragreement with experimental deformation parameters and low-lyingenergy spectra, respectively. This emphasizes theimportance of accounting for the shape fluctuations.

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