  Within a dynamical transport approach we investigate charged current
interactions in neutrino-nucleus reactions for neutrino energies of 0.3 - 1.5
GeV with particular emphasis on resonant pion production channels via the
$\Delta_{33}(1232)$ resonance. The final-state-interactions of the resonance as
well as of the emitted pions are calculated explicitly for $^{12}C$ and
$^{56}Fe$ nuclei and show a dominance of pion suppression at moderate momenta
$p_\pi >$ 0.2 GeV/c. A comparison to integrated $\pi^+$ spectra for $\nu_\mu +
^{12}C$ reactions with the available (preliminary) data demonstrates a
reasonable agreement.

Nuclear Theory