Abstract
The discovery of light nuclei with neutron halos has opened new perspectives for nuclear structure and a possibility to study genuine few-body aspects of matter. A number of borromean systems where the system is bound but where no binary subsystems are bound, are realized by nature in the context of nuclei, 11Li being the nucleus which has had most recent attention. Although a large number of calculations have addressed the detailed structure of the 11Li neutron halo, no single model has yet explained all the data presently available. This is in part due to uncertainties in the n+9Li interaction. For 6He, also a borromean system, where the n + core interaction is known, the best three-body and reaction models succeed in reproducing the data. In the 11Li case, a major uncertainty concerns the effect of possible 1s intruder states.
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