Unified mechanism behind the even-parity ground state and neutron halo of 11 Be

Using the axially deformed relativistic Hartree-Fock-Bogoliubov (D-RHFB) model, we explore the mechanism behind the parity inversion and halo occurrence in 11 Be, which are well reproduced by the RHF Lagrangian PKA1. It is illustrated that evidently enhanced deformation effects by the π -pseudo-vect...

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Bibliographic Details
Published in:Chinese physics C 2023-04, Vol.47 (4), p.44102
Main Authors: Geng, Jing, Niu, Yi Fei, Long, Wen Hui
Format: Article
Language:English
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Summary:Using the axially deformed relativistic Hartree-Fock-Bogoliubov (D-RHFB) model, we explore the mechanism behind the parity inversion and halo occurrence in 11 Be, which are well reproduced by the RHF Lagrangian PKA1. It is illustrated that evidently enhanced deformation effects by the π -pseudo-vector and ρ -tensor couplings in PKA1 are crucial for correctly describing both the even-parity ground state (GS) and the neutron halo of 11 Be. Coupling with the deformation, the intrude component largely enhances the couplings between the even-parity orbit and the nuclear core to ensure an even-parity GS, whereas the component therein dominates the halo formation in 11 Be. Moreover, the deformed halo in 11 Be is found to be stabilized by the attractive inherent correlations between the and components of the halo orbit , instead of pairing correlations, which paves a new way for understanding the halo pictures in deformed unstable nuclei.
ISSN:1674-1137
2058-6132
DOI:10.1088/1674-1137/acb7cd