Theory of the nuclear excitation by electron transition process near the K-edge

We propose a model for description of the process of Nuclear Excitation by Electron Transition (NEET) near the $K$-shell ionization threshold of an atom. We explain the experimental results for the $^{197}$Au cross section excitation $\sigma_{N^*}$ obtained by S.Kishimoto et al. Phys. Rev. C {\bf 74}, 031301(R) (2006) using synchrotron radiation near the Au $K$-edge. We predict the behavior of $\sigma_{N^*}$ as a function of the incident photon energy for nuclei $^{193}$Ir and $^{189}$Os. We reveal that the $^{189}$Os excitation begins when the energy of incident photons is below the $K$-shell ionization threshold in Os.Comment: 12 pages, 5 figure