Neutrino Nucleus Scattering

The status of the theoretical description of the neutrino-nuclear interaction for low and intermediate energies is reviewed and its results are compared with the existing data. Particular emphasis is on C, the ingredient of liquid scintillator, and on O, the main component of the water Čerenkov detectors. First, I show that the data on the exclusive process populating the ground state of N are well reproduced by the theory. This is also the case for the excitation of the continuum with low energy neutrinos from the muon decay at rest and for muon capture. However, for not yet understood reasons, the theory overestimates the cross section for higher energy neutrinos from the pion decay in flight, by up to 50%. I also show that the Continuum Random Phase Approximation and the Relativistic Fermi Gas model give very similar full and differential cross sections for neutrino energies of several hundred MeV, thus checking one method against the other.