Strong dineutron correlation in 8He and 18C

Abstract

We study the spatial structure of four valence neutrons in the ground state of ${}^8$He and ${}^{18}$C nuclei using a core+4$n$ model. For this purpose, we employ a density-dependent contact interaction among the valence neutrons, and solve the five-body Hamiltonian in the Hartree-Fock-Bogoliubov (HFB) approximation. We show that two neutrons with the coupled spin of $S$=0 exhibit a strong dineutron correlation around the surface of these nuclei, whereas the correlation between the two dineutrons is much weaker. Our calculation indicates that the probability of the (1p${}_{3/2}{)}^4$ and [(1p${}_{3/2}{)}^2$ (p${}_{1/2}{)}^2$] configurations in the ground state wave function of ${}^8$He nucleus is 34.9% and 23.7%, respectively. This is consistent with the recent experimental finding with the ${}^8$He($p,t{)}^6$He reaction, that is, the ground state wave function of ${}^8$He deviates significantly from the pure (1p${}_{3/2}{)}^4$ structure.

10 pages, 9 figures, 3 tables

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Cited by in corpus (14)

• Relativistic description of BCS-BEC crossover in nuclear matter
• Experimental study of intruder components in light neutron-rich nuclei via single-nucleon transfer reaction
• BCS-BEC Crossover in Symmetric Nuclear Matter at Finite Temperature: Pairing Fluctuation and Pseudogap
• Di-neutron correlation in soft octupole excitations of neutron-rich Ni isotopes beyond N=50
• Strong neutron pairing in core+4n nuclei
• Dineutron correlations in quasi two-dimensional systems in a simplified model and possible relation to neutron-rich nuclei
• Cooper pair sizes in 11Li and in superfluid nuclei: a puzzle?
• Multi-neutron transfer in ${}^8$He induced reactions near the Coulomb barrier
• Dineutron-dineutron correlation in ${}^8$He
• Drastic change in inelastic scattering depending on the development of dineutron correlation in ${}^{10}$Be
• Two-neutron correlations in microscopic wave functions of He-6, He-8 and C-12
• Di-neutron correlation in light neutron-rich nuclei
• Beyond the neutron-drip line: two-neutron decay of unbound nuclei
• Dineutron clusters in ${}^7$He and ${}^8$He structure