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arXiv 2008.08870nucl-thnucl-ex
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基于Gogny能量密度泛函相互作用玻色子模型的轻锕系元素八极关联

Octupole correlations in light actinides from the interacting boson model based on the Gogny energy density functional

K. Nomura, R. Rodríguez-Guzmán, Y. M. Humadi, L. M. Robledo, J. E. García-Ramos

摘要:

本文研究了偶偶轻锕系元素$^{218-238}$ Ra和$^{220-240}$ Th的四极-八极耦合及其光谱性质。基于Gogny-D1 M能量密度泛函的Hartree-Fock-Bogoliubov近似已被用作微观输入,即,以获得作为四极和八极形变参数的函数的(轴对称)平均场势能面。利用玻色子凝聚态下$sdf$相互作用玻色子模型(IBM)哈密顿量的期望值,将平均场势能面映射到相应的玻色子势能面上.通过这一映射过程确定了$sdf$ -IBM哈密顿量的强度参数。映射的IBM哈密顿量的对角化提供了正和负宇称态的能量以及用于获得过渡强度的波函数。计算结果与库仑激发实验的数据进行了比较,并指出在$^{224}$ Ra和$^{226}$ Th附近存在明显的八极集体。

英文摘要:

The quadrupole-octupole coupling and the related spectroscopic properties have been studied for the even-even light actinides $^{218-238}$Ra and $^{220-240}$Th. The Hartree-Fock-Bogoliubov approximation, based on the Gogny-D1M energy density functional, has been employed as a microscopic input, i.e., to obtain (axially symmetric) mean-field potential energy surfaces as functions of the quadrupole and octupole deformation parameters. The mean-field potential energy surfaces have been mapped onto the corresponding bosonic potential energy surfaces using the expectation value of the $sdf$ Interacting Boson Model (IBM) Hamiltonian in the boson condensate state. The strength parameters of the $sdf$-IBM Hamiltonian have been determined via this mapping procedure. The diagonalization of the mapped IBM Hamiltonian provides energies for positive- and negative-parity states as well as wave functions which are employed to obtain transitional strengths. The results of the calculations compare well with available data from Coulomb excitation experiments and point towards a pronounced octupole collectivity around $^{224}$Ra and $^{226}$Th.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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