Abstract
A comparative study is made of the momentum-space structure of dineutrons in the Borromean nuclei $^{11}\mathrm{Li}$, $^{6}\mathrm{He}$, $^{22}\mathrm{C}$, and $^{19}\mathrm{B}$. The ground-state properties of these nuclei are well described by a three-body model using a newly constructed finite-range $nn$ interaction in momentum space. I clarify how the mean opening angle between momenta of valence neutrons and the opening-angle distribution reflect the two-neutron density of the Borromean nuclei. By indicating the similarities to the distributions for the correlation angle in the knockout-reaction experiments, I show that the angular correlations of halo neutrons can provide rich information for the characteristic structure of dineutrons in the Borromean nuclei.
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