| Popis: |
We have calculated muonic-atom nuclear polarization (NP) energy shifts for 208 Pb using the renormalized random-phase approximation (RPA) to describe the nuclear excitations. Our RPA spectra are in good agreement with a number of direct experimental measurements, giving us confidence that the present NP results are more reliable than those of previous calculations by other authors. We find generally smaller energy shifts than in earlier work, in disagreement with several empirical determinations of these effects. Through a more critical examination of the data, we argue that those empirical determinations may be incorrect, and we suggest that the difficulties in fitting the data may lie in the splittings rather than in the absolute values of the transition energies, as has been assumed previously. Using empirical properties of some low-lying states in the isotopes 204, 206, 207, 208 Pb, we adjust and extend our results to provide a nearly complete and successful description of all such effects in these isotopes. |
