Experimental Study of the BEC-BCS Crossover Region in Lithium 6
  We report Bose-Einstein condensation of weakly bound $^6$Li$_2$molecules in a crossed optical trap near a Feshbach resonance. We measure a molecule-molecule scattering length of$170^{+100}_{-60}$ nm at 770 G, in good agreement with theory.We study the expansion of the cloud in the BEC-BCS crossoverregion. 
T. Bourdel, L. Khaykovich, J Cubizolles, J. Zhang, F. Chevy, M.   Teichmann, L. Tarruell, S.J.J.M.F. Kokkelmans, C. Salomon