Time interval distributions of atoms in atomic beams
  We report on the experimental investigation of two-particle correlations between neutral atoms in a Hanbury Brown and Twiss experiment. Both an atom laser beam and a pseudo-thermal atomic beam are extracted from a Bose-Einstein condensate and the atom flux is measured with a single atom counter. We determine the conditional and the unconditional detection probabilities for the atoms in the beam and find good agreement with the theoretical predictions. 
Michael K\"ohl, Anton \"Ottl, Stephan Ritter, Tobias Donner, Thomas   Bourdel, Tilman Esslinger