%0 Journal Article %T Quantum resonances and time decay for a double-barrier model %A Andrea Sacchetti %J Physics %D 2014 %I arXiv %X Here we consider the time evolution of a one-dimensional quantum system with a double barrier given by a couple of two repulsive Dirac's deltas. In such a "pedagogical" model we give, by means of the theory of quantum resonances, the explicit expression of the dominant terms of $<\psi, e^{-it H} \phi >$, where $H$ is the double-barrier Hamiltonian operator and where $\psi$ and $\phi$ are two test functions. %U http://arxiv.org/abs/1411.4506v1