Charge radii and neutron correlations in helium halo nuclei
Abstract
Within the complex-energy configuration interaction framework, we study correlations of valence neutrons to explain the behavior of charge radii in the neutron halo nuclei 6,8He. We find that the experimentally observed decrease of the charge radius between 6He and 8He is caused by a subtle interplay between three effects: dineutron correlations, a spin-orbit contribution to the charge radius, and a core swelling effect. We demonstrate that two-neutron angular correlations in the 2+1 resonance of 6He differ markedly from the ground-state correlations in 6,8He.
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