Summary form only given. Recently Bose-Einstein condensation (BEG) of ultracold atomic gases has been realized. In these experiments the gases are so dilute that only two-body interactions are relevant. The stability and character of the condensate for atoms with negative scattering length remains a new challenge for manybody theory. We are experimentally investigating these questions using a permanent magnet trap to confine 7Li. By evaporative cooling, phase-space densities that are more than 100 times greater than those required for quantum degeneracy can be created.
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