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Parity violation effects (PV) in nuclear reaction were discovered in the 60years of the last century in the capture of thermal transversal polarizedneutrons by 113Cd nucleus. In this reaction experimentally was measured a nonzero asymmetry of emitted gamma quanta and the results was interpreted by theexistence of weak non leptonic interaction between nucleons in the compoundnucleus. This first experimental result gave a serious impulse of theoreticaland experimental developments of parity violation question in nuclearreactions. The weak interaction acts in the background of strong interaction(with order of magnitude higher) and therefore it is very difficult to observeand evidence it. One possibility is the evaluation of asymmetry effects inducedby PV phenomena. For neutrons scattering there are a few asymmetry effects(like polarization of incident neutron beam, spin rotation and emitted neutronsasymmetry of incident transversal polarized neutrons) explained by the presenceof weak interaction. In natural Lead were observed an unexpected high value ofneutron spin rotation due to the PV phenomena. The natural Lead contains fourisotopes and the main contribution to the PV effects is given by 204Pb. Furtherto explain the high value of neutron spin rotation it was supposed theexistence of a new negative P resonance with energy EP = - 16 eV. In this workwere estimated the PV effects in neutrons scattering in order to extract theweak matrix element and to verify the existence of the new negative resonanceof 204Pb nucleus.

Search of parity violation effects in neutron reaction on natural Lead