Abstract
An advanced relativistic approach is presented to studying spectroscopy and photodynamics of the exotic (pionic) atomic systems based on the Klein-Gordon-Fock equation approach and relativistic many-body perturbation theory with accounting for the fundamental electromagnetic and strong pion-nuclear interactions. The strong pion-nuclear interactions are taken into account by means of using the generalized strong pion-nuclear optical potential model with the effective Ericson-Ericson potential. The nuclear finite size effect is taken into consideration within the Fermi model. In order to take the nuclear quadrupole deformation effects on pionic processes into account we have used the model by Toki et al. The radiative corrections are effectively taken into account within the generalized Uehling-Serber approximation to treat the Lamb shift vacuum polarization part. The advanced data for the energy and spectral parameters for pionic atoms of the 173Yb, 175Lu, 197Au, 208Pb, 238U with accounting for the radiation (vacuum polarization), nuclear (finite size of a nucleus ) and the strong pion-nuclear interaction corrections are listed.
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