  We study the dynamical response of cold interacting atoms in the Mott
insulator phase to a static force. As shown in the experiment by M. Greiner et.
al., Nature \textbf{415}, 39 (2002), this response has resonant character, with
the main resonance defined by coincidence of Stark energy and on-site
interaction energy. We analyse the dynamics of the atomic momentum
distribution, which is the quantity measured in the experiment, for near
resonant forcing. The momentum distribution is shown to develop a recurring
interference pattern, with a recurrence time which we define in the paper.
