Octupole deformation for Ba isotopes in a reflection-asymmetric relativistic mean-field approach

Abstract

The potential energy surfaces of even-even ${}^{142-156}$Ba are investigated in the constrained reflection-asymmetric relativistic mean-field approach with parameter set PK1. It is shown that for the ground states, ${}^{142}$Ba is near spherical,${}^{156}$Ba well quadrupole-deformed, and in between ${}^{144-154}$Ba octupole deformed. In particular, the nuclei ${}^{148,150}$Ba with $N=92,94$ have the largest octupole deformations. By including the octupole degree of freedom, energy gaps $N=88$, $N=94$ and $Z=56$ near Fermi surfaces for the single-particle levels in ${}^{148}$Ba with ${\beta }_2\sim 0.26$ and ${\beta }_3\sim 0.17$ are found. Furthermore, the performance of the octupole deformation driving pairs ($\nu 2f_{7/2}$, $\nu 1i_{13/2}$) and ($\pi 2d_{5/2}$, $\pi 1h_{11/2}$) is demonstrated by analyzing the single-particle levels near Fermi surfaces in ${}^{148}$Ba.

7 pages, 3 figures, 3 tables

References in corpus (6)

• Nuclear Ground-State Masses and Deformations
• Relativistic Continuum Hartree Bogoliubov Theory for Ground State Properties of Exotic Nuclei
• New effective interactions in RMF theory with non-linear terms and density-dependent meson-nucleon coupling
• A Giant Halo at the Neutron Drip Line
• Reflection asymmetric relativistic mean field approach and its application to the octupole deformed nucleus ${}^{226}$Ra
• Octupole degree of freedom for the critical-point candidate nucleus ${}^{152}$Sm in a reflection-asymmetric relativistic mean-field approach

Cited by in corpus (7)

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• Spectroscopy of reflection-asymmetric nuclei with relativistic energy density functionals
• Octupole deformation in light actinides within an analytic quadrupole octupole axially symmetric model with Davidson potential
• Shape transition with temperature of the pear-shaped nuclei in covariant density functional theory
• Single particle in a reflection-asymmetric potential
• Ground state and fission properties of even-$A$ uranium isotopes from multidimensionally-constrained relativistic mean field model