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We demonstrate a double-trap system well suited to study cold collisionsbetween trapped ions and trapped atoms. Using Yb$^+$ ions confined in a Paultrap and Yb atoms in a magneto-optical trap, we investigate charge-exchangecollisions of several isotopes for collision energies down to 400 neV (5 mK).The measured rate coefficient of $6 \times 10^{-10}$ cm$^{3}$s$^{-1}$, constantover four orders of magnitude in collision energy, is in good agreement withthat derived from a semiclassical Langevin model for an atomic polarizabilityof 143 a.u.

Observation of Cold Collisions between Trapped Ions and Trapped Atoms