  We evaluate the quasielastic and multinucleon contributions to the
antineutrino nucleus scattering cross section and compare our results with the
recent MiniBooNE data. We use a local Fermi gas model that includes RPA
correlations and gets the multinucleon part from a systematic many body
expansion of the $W$ boson selfenergy in the nuclear medium. The same model had
been quite successful for the neutrino cross section and contains no new
parameters. We have also analysed the relevance of 2p2h events for the
antineutrino energy reconstruction.
