Nuclear Shadowing in Electro-Weak Interactions
  Shadowing is a quantum phenomenon leading to a non-additivity of electroweak cross sections on nucleons bound in a nucleus. It occurs due to destructive interference of amplitudes on different nucleons. Although the current experimental evidence for shadowing is dominated by charged-lepton nucleus scattering, studies of neutrino nucleus scattering have recently begun and revealed unexpected results. 
B. Z. Kopeliovich, J. G. Morfin, Ivan Schmidt
hep-ph hep-ex nucl-th