Overlapping Bose-Einstein condensates of Na23 and Cs133

  title={Overlapping Bose-Einstein condensates of 
  author={Claire Warner and Aden Z. Lam and Niccolo' Bigagli and Henry C. Liu and Ian C. Stevenson and Sebastian A Will},
  journal={Physical Review A},
We report on the creation of dual-species Bose-Einstein condensates (BECs) of 23Na atoms and 133Cs atoms. We demonstrate sympathetic cooling of Cs with Na in a magnetic quadrupole trap and a crossed optical dipole trap, leading to Na BECs with 8× 105 atoms and Cs BECs with 3.5× 104 atoms. Investigating cross-thermalization and lifetimes of the mixture, we find that the Na and Cs BECs are miscible and overlapping, interacting with a moderate interspecies scattering length of 18(4)a0 at 23G and… 
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