标题： 基于平均场的IBM-1哈密顿量与固有三轴变形 显示英文标题

标题： Mean-field derived IBM-1 Hamiltonian with intrinsic triaxial deformation

摘要： 基于从使用Skyrme能量密度泛函的自洽平均场计算得出的相互作用玻色子模型1（IBM-1）哈密顿量被用于研究偶偶核 $^{162-184}\mathrm{Hf}$ 和 $^{168-186}\mathrm{W}$ 的能谱和 $B(E2)$ 转换强度。 由费米子代理-SU(3)不可约表示导出的固有三轴变形被纳入IBM-1势能曲线，并映射到费米子势能曲线，以推导IBM-1哈密顿量的参数。 研究表明，由代理-SU(3)不可约表示导出的固有三轴变形的引入显著改善了理论预测与所检查同位素中低激发态四极带实验数据之间的符合程度，而无需在IBM-1哈密顿量中加入高阶项。 与轴对称情况相比，计算得到的 $B(E2)$ 转换强度也得到了改善。 最近提出的核图表扩展区域内三轴变形占优势的现象作为副产品得到了。 还讨论了此映射方法未来可能的改进和扩展。 显示英文摘要

摘要： An interacting-boson-model-1 (IBM-1) Hamiltonian, derived from self-consistent mean-field calculations using a Skyrme energy density functional is employed for the study of energy spectra and $B(E2)$ transition strengths in the even-even $^{162-184}\mathrm{Hf}$ and $^{168-186}\mathrm{W}$. An intrinsic triaxial deformation, derived from fermionic proxy-SU(3) irreps, is incorporated into the IBM-1 potential energy curve, which is subsequently mapped to the fermionic one, in order to derive the parameters of the IBM-1 Hamiltonian. It is shown that the inclusion of the intrinsic triaxial deformation derived from the proxy-SU(3) irreps leads to a significantly improved agreement between the theoretical predictions and experimental data for the low-lying quadrupole bands in the examined isotopes, without the need of higher-order terms in the IBM-1 Hamiltonian. The calculated $B(E2)$ transition strengths are also improved, compared to the axially symmetric case. The recently suggested preponderance of triaxial deformation over extended regions of the nuclear chart is obtained as a by-product. Future potential improvements and extensions to this mapping approach are also discussed.