  Motivated by recent experiments we study the interconversion between
ultracold atomic and molecular condensates, quantifying the resulting
oscillations and their slow decay. We find that near equilibrium the dominant
damping source is the decay of condensed molecules into non-condensed pairs,
with a pair kinetic energy that is resonant with the frequency of the
oscillating atom-molecule interconversions. The decay, however, is
non-exponential, as strong population of the resonant pairs leads to Bose
enhancement. Introducing an oscillating magnetic field, which periodically
modulates the molecular binding energy, enhances the oscillations at short
times. However, the resulting enhancement of the pair-production process
results in an accelerated decay which rapidly cuts off the initial oscillation
growth.
