  We study the quantum tunnel effect through a potential barrier employing a
semiclassical formulation of quantum mechanics based on expectation values of
configuration variables and quantum dispersions as dynamical variables. The
evolution of the system is given in terms of a dynamical system for which we
are able to determine effective trajectories for individual particles, in a
total resemblance of the Bohmian description of quantum mechanics. We obtain a
type of semiclassical confinement for particles in a similar way as with the
quantum potential, and also determine a semiclassical transmission coefficient
for the tunneling process.
