We study the decay dynamics of an interacting Bose-Einstein condensate in thepresence of a metastable trapping potential from which the condensate canescape via tunneling through finite barriers. The time-dependent decay processis reproduced by means of the instantaneous decay rates of the condensate at agiven population of the quasi-bound state, which are calculated with the methodof complex scaling. Both for the case of a double barrier potential as well asfor the case of a tilted periodic potential, we find pronounced deviations froma monoexponential decay behaviour which would generally be expected in theabsence of the atom-atom interaction.
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