CORRELATIONS IN A MANY-BODY CALCULATION OF LI-11

A many-body calculation of Li-11 is presented where the only input is the well-tested, finite-range D1S effective interaction of Gogny. The nucleus ground state is modeled as a generator coordinate method confi guration mixing of Hartree-Fock-Bogolyubov states generated with a con straint on the mean square radius. Pairing correlations are computed f rom the two-body interaction itself. The kinds of correlations include d in this way are found to play an important role in describing the la rge Li-11 radius. A substantive underlying Li-9 core of Li-11 is found , which has a different density profile than a free Li-9 nucleus. The relations of this work with other approaches are discussed.