EFFECTS OF LI-10 VIRTUAL STATES ON THE STRUCTURE OF LI-11

The presence of a low-lying 1s1/2 virtual state in the n+Li-9 system, when included in Faddeev three-body calculations, has a pronounced effect on the structure of the Li-11 halo. The resulting Li-9 momentum distributions, calculated in the Serber model, have a narrow width comparable with the experimental data. The structure of Li-11 would then have nearly 50% of s-wave motion between the neutrons and the core. The three-body system may also approximately fulfill the conditions for the appearance of Efimov states, and there may exist low-lying excited states near the breakup threshold.