  Devices based on ultracold atoms moving in an accelerating optical lattice or
double-well potential are a promising tool for precise measurements of
fundamental physical constants as well as for the construction of sensors.
Here, we carefully analyze the model of a couple of BECs separated by a barrier
in an accelerated field and we show how the observable quantities, mainly the
period of the beating motion or of the phase-shift, are related to the physical
parameters of the model as well as to the energy of the initial state.
