Microscopic analysis of octupole shape transitions in neutron-rich actinides with relativistic energy density functional

作者：Xu, Zhong; Li, Zhi-Pan^*

来源：Chinese Physics C, 2017, 41(12): 124107.

DOI：10.1088/1674-1137/41/12/124107

• ocutpole deformation
• negative-parity band
• relativistic energy density functional
• quadrupole-octupole collective Hamiltonian

Quadrupole and octupole deformation energy surfaces, low-energy excitation spectra, and electric transition rates in eight neutron-rich isotopic chains - Ra, Th, U, Pu, Cm, Cf, Fm, and No are systematically analyzed using a quadrupole-octupole collective Hamiltonian model, with parameters determined by constrained reflection asymmetric and axially-symmetric relativistic mean-field calculations based on the PC-PK1 energy density functional. The theoretical results of low-lying negative-parity bands, odd-even staggering, average octupole deformations 03), and B(E3;3(1)(-) -> 0(1)(+)) show evidence of a shape transition from nearly spherical to stable octupole-deformed, and finally octupole-soft equilibrium shapes in the neutron-rich actinides. A microscopic mechanism for the onset of stable octupole deformation is also discussed in terms of the evolution of single-nucleon orbitals with deformation.

• 出版日期2017-12
• 单位西南大学