Two-particle correlations in continuum dipole transitions in Borromean nuclei

Abstract

We discuss the energy and angular distributions of two emitted neutrons from the dipole excitation of typical weakly-bound Borromean nuclei, ${}^{11}$Li and ${}^6$He. To this end, we use a three-body model with a density dependent contact interaction between the valence neutrons. Our calculation indicates that the energy distributions for the valence neutrons are considerably different between the two nuclei, although they show similar strong dineutron correlations in the ground state to each other. This different behaviour of the energy distribution primarily reflects the interaction between the neutron and the core nucleus, rather than the interaction between the valence neutrons. That is, the difference can be attributed to the presence of s-wave virtual state in the neutron-core system in ${}^{11}$Li, which is absent in ${}^6$He. It is pointed out that the angular distribution for ${}^{11}$Li in the low energy region shows a clear manifestation of the strong dineutron correlation, whereas the angular distribution for ${}^6$He exhibits a strong anticorrelation effect.

4 pages, 14 eps figures

References in corpus (8)

• Pairing correlations in nuclei on the neutron-drip line
• Di-neutron correlation and soft dipole excitation in medium mass neutron-rich nuclei near drip-line
• Coexistence of BCS and BEC-like pair structures in halo nuclei
• Three-body correlations in Borromean halo nuclei
• Generic strong coupling behavior of Cooper pairs in the surface of superfluid nuclei
• Charge radius and dipole response of ${}^{11}$Li
• Dipole excitation and geometry of borromean nuclei
• Efimov effect in nuclear three-body resonance decays

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