Effects of the nuclear correlations on the neutrino-oxygen interactions

We perform a calculation of the absolute charged current neutrino-oxygen events rates relevant in the atmospheric neutrino experiments. The inclusive reaction crosssection is split into exclusive channels, which are classified according to the number of Čerenkov rings they produce. The model includes the effects of residual interaction in a RPA scheme with both nucleon-hole and Delta-hole excited states and the effects of (npnh) excitations (n=2,3 ). Our result is that although the flavor ratio μ/e remains almost unaffected by the nuclear effects considered here and often neglected in the Monte-Carlo simulations, the absolute events rates are subject to important modifications. PACS 13.15.+gNeutrino interactions; 14.40.-nMesons; 24.30.GdOther resonances