Influence of perturbations on the electron wave function inside the   nucleus
  A variation of the valence electron wave function inside a nucleus induced by a perturbative potential is expressed in terms of the potential momenta. As an application we consider QED vacuum polarization corrections due to the Uehling and Wichmann-Kroll potentials to the weak interaction matrix elements. 
M.Yu.Kuchiev, V.V.Flambaum (University of New South Wales, Sydney)