Landscape of pear-shaped even-even nuclei

被引:69
|
作者
Cao, Yuchen [1 ,2 ]
Agbemava, S. E. [3 ]
Afanasjev, A., V [3 ]
Nazarewicz, W. [2 ,4 ]
Olsen, E. [5 ]
机构
[1] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA
[2] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
[3] Mississippi State Univ, Dept Phys & Astron, Starkville, MS 39762 USA
[4] Michigan State Univ, Facil Rare Isotope Beams, E Lansing, MI 48824 USA
[5] Univ Libre Bruxelles, Inst Astron & Astrophys, B-1050 Brussels, Belgium
关键词
STABLE OCTUPOLE DEFORMATION; ODD ELECTROMAGNETIC MOMENTS; NEUTRON-RICH; CONTRASTING BEHAVIOR; REFLECTION ASYMMETRY; EXCITED-STATES; HIGH-SPIN; COLLECTIVITY; QUADRUPOLE; STABILITY;
D O I
10.1103/PhysRevC.102.024311
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
Background: The phenomenon of reflection-asymmetric nuclear shapes is relevant to nuclear stability, nuclear spectroscopy, nuclear decays and fission, and the search for new physics beyond the standard model. Global surveys of ground-state octupole deformation, performed with a limited number of models, suggest that the number of pear-shaped isotopes is fairly limited across the nuclear landscape. Purpose: We carry out a global analysis of ground-state octupole deformations for particle-bound even-even nuclei with Z <= 110 and N <= 210 using nuclear density functional theory (DFT) with several nonrelativistic and covariant energy density functionals. In this way, we can identify the best candidates for reflection-asymmetric shapes. Methods: The calculations are performed in the frameworks of axial reflection-asymmetric Hartree-Fock-Bogoliubov theory and relativistic Hartree-Bogoliubov theory using DFT solvers employing harmonic oscillator basis expansion. We consider five Skyrme and four covariant energy density functionals. Results: We predict several regions of ground-state octupole deformation. In addition to the "traditional" regions of neutron-deficient actinide nuclei around Ra-224 and neutron-rich lanthanides around Ba-146, we identified vast regions of reflection-asymmetric shapes in very neutron-rich nuclei around Gd-200 and Pu-288, as well as in several nuclei around Ba-112. Our analysis suggests several promising candidates with stable ground-state octupole deformation, primarily in the neutron-deficient actinide region, that can be reached experimentally. Detailed comparison between Skyrme and covariant models is performed. Conclusions: Octupole shapes predicted in this study are consistent with the current experimental information. This work can serve as the starting point of a systematic search for parity doublets in odd-mass and odd-odd nuclei, which will be of interest in the context of new physics searches.
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页数:12
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