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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 $^{6,8}$He. We find that the experimentally observed decrease of the charge radius between $^6$He and $^8$He 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 $^6$He differ markedly from the ground-state correlations in $^{6,8}$He.
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Contributor : Michel Lion <>
Submitted on : Friday, September 2, 2011 - 8:50:09 AM
Last modification on : Thursday, February 1, 2018 - 1:26:25 AM

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G. Papadimitriou, A.T. Kruppa, N. Michel, W. Nazarewicz, M. Ploszajczak, et al.. Charge radii and neutron correlations in helium halo nuclei. Physical Review C, American Physical Society, 2011, 84, pp.051304(R). ⟨10.1103/PhysRevC.84.051304⟩. ⟨in2p3-00618511⟩



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