Octupole deformation in the ground states of even-even nuclei: A global analysis within the covariant density functional theory

被引：115

作者：

Agbemava, S. E. ^{[1
]}

Afanasjev, A. V. ^{[1
]}

Ring, P. ^{[2
]}

机构：

[1] Mississippi State Univ, Dept Phys & Astron, Mississippi State, MS 39762 USA

[2] Tech Univ Munich, Fak Phys, D-85748 Garching, Germany

来源：

PHYSICAL REVIEW C | 2016年 / 93卷 / 04期

关键词：

MEAN-FIELD-THEORY; REFLECTION ASYMMETRY; ATOMIC-NUCLEI; FISSION-BARRIERS; FINITE NUCLEI; SHAPE CHANGES; HIGH SPINS; ISOTOPES; TH; DYNAMICS;

D O I：

10.1103/PhysRevC.93.044304

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

A systematic investigation of octupole-deformed nuclei is presented for even-even systems with Z <= 106 located between the two-proton and two-neutron driplines. For this study we use five most-up-to-date covariant energy density functionals of different types, with a nonlinear meson coupling, with density-dependent meson couplings, and with density-dependent zero-range interactions. Pairing correlations are treated within relativistic Hartree-Bogoliubov theory based on an effective separable particle-particle interaction of finite range. This allows us to assess theoretical uncertainties within the present covariant models for the prediction of physical observables relevant for octupole-deformed nuclei. In addition, a detailed comparison with the predictions of nonrelativistic models is performed. A new region of octupole deformation, centered around Z similar to 98, N similar to 196 is predicted for the first time. In terms of its size in the (Z, N) plane and the impact of octupole deformation on binding energies this region is similar to the best known region of octupole-deformed nuclei centered at Z similar to 90, N similar to 136. For the later island of octupole-deformed nuclei, the calculations suggest substantial increase of its size as compared with available experimental data.

引用

页数：24

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