Unified mechanism behind the even-parity ground state and neutron halo of ${}^{11}$Be

Abstract

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 $\pi$-pseudo-vector and $\rho$-tensor couplings in PKA1 are crucial for correctly describing both even-parity ground state (GS) and neutron halo of ${}^{11}$Be. Coupling with the deformation, the intrude $1d_{5/2}$ component largely enhances the couplings between the even-parity orbit $1/2_2^{+}$ and the nuclear core to promise the even-parity GS, whereas the $2s_{1/2}$ 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 $1d_{5/2}$ and $2s_{1/2}$ components of the halo orbit $1/2_2^{+}$, instead of pairing correlations, which paves a new way to understand the halo pictures in deformed unstable nuclei.

4 figures, 1 table, 9 pages

References in corpus (12)

• Relativistic Continuum Hartree Bogoliubov Theory for Ground State Properties of Exotic Nuclei
• Microscopic justification of the Equal Filling approximation
• Shell Structure and $\rho$-Tensor Correlations in Density-Dependent Relativistic Hartree-Fock theory
• Evolution of Nuclear Shell Structure due to the Pion Exchange Potential
• Can Ab Initio Theory Explain the Phenomenon of Parity Inversion in ${}^{11}$Be?
• Nuclear halo structure and pseudo-spin symmetry
• Odd systems in deformed relativistic Hartree Bogoliubov theory in continuum
• Non-local mean field effect on nuclei near Z=64 sub-shell
• Tensor effects on gap evolution of N=40 from non-relativistic and relativistic mean-field theory
• Relativistic Hartree-Fock-Bogoliubov model for deformed nuclei
• Relativistic Hartree-Fock-Bogoliubov model for axially deformed nuclei
• Halo effective field theory analysis of one-neutron knockout reactions of ${}^{11}\mathrm{Be}$ and ${}^{15}\mathrm{C}$

Cited by in corpus (2)

• Ab initio study of the beryllium isotopes ${}^7$Be to ${}^{12}$Be
• Exact-exchange relativistic density functional theory in three-dimensional coordinate space