Dineutron formation and breaking in ${}^8$He

Abstract

We discuss the correlation of the spin-singlet two-neutron pair, the dineutron correlation, in the ground and excited $0^{+}$ states of ${}^8$He by using a method to describe the dineutron correlation in neutron-rich nuclei, the dineutron condensate wave function. The shell-model configuration and the dineutron configuration compete with each other in the ground state of ${}^8$He. We compare the ground state structure of ${}^8$He with that of ${}^6$He and suggest that the dineutron correlation is weaker in the ground state of ${}^8$He than ${}^6$He. We also suggest the possibility of the dineutron condensation in an excited $0^{+}$ state of ${}^8$He. In addition, we investigate the formation mechanism of the dineutron condensation in ${}^8$He by using a newly developed framework, $\alpha$ and dineutron condensate wave function, and conclude that the attraction from the core is essential for the formation of the dineutron condensation.

17 pages, 7 figures

References in corpus (5)

• Alpha-particle condensation in 16O via a full four-body OCM calculation
• Coexistence of BCS and BEC-like pair structures in halo nuclei
• Dineutron structure in ${}^8$He
• Novel cluster states in ${}^{10}$Be
• Gas-like state of $\alpha$ clusters around ${}^{16}$O core in ${}^{24}$Mg

Cited by in corpus (7)

• Di-neutrons in neutron matter within Brueckner-Hartree-Fock approach
• Mirror symmetry breaking in He isotopes and their mirror nuclei
• Multi-neutron transfer in ${}^8$He induced reactions near the Coulomb barrier
• 2alpha+t cluster feature of $3/2_3^{-}$ state in ${}^{11}$B
• Dineutron-dineutron correlation in ${}^8$He
• Analysis of the effect of core structure upon dineutron correlation using antisymmetrized molecular dynamics
• Dineutron clusters in ${}^7$He and ${}^8$He structure