Negative energy correction for nuclear polarization in muonic atoms

Negative energy corrections to the conventional calculations of nuclear pol arization effects in muonic atoms are calculated. It is shown that the corr ections are negligible as far as the NP effects due to low-lying nuclear st ates and states in the giant resonance regions are concerned. However, the formula used for the muonic NP calculations breaks down if nuclear excitati ons with larger energies than the muonic mass are considered. This means th at the method cannot be used for calculations of NP effects in electronic a toms.