Relativisticab initiocalculation of the xenon 5sionization spectra for the (γ,e) and (e,2e) reactions

We have calculated separation-energy spectra following the removal of the xenon 5s valence electron either by a photon [({γ},e) reaction] or by a fast electron [(e,2e) reaction]. Relative line intensities in the (e,2e) spectrum are equal to the corresponding spectroscopic factors being determined as the single-hole Green's-function pole strength. The Green's function accounts for virtual two-hole--one-electron excitations of 5p⁴nl(l=d,s) type. Spin-orbit interaction is taken into account by constructing 5p⁴nl J^π=1/2⁺ eigenvectors from different 5p⁴(L₁{S}₁$)nl LS Hartree-Fock states of which only the 5${p}⁴(¹D)nd ²{S}1/2$ states are allowed to interact directly with the one-hole 5${s}¹$5${p}⁶$ $²S1/2 state. Relative line intensities in the ({γ},e) spectrum are influenced by the atomic ground-state correlations, which change most significantly the intensity of the main line and the continuous spectrum. Results of the calculation are discussed in connection with the difference between the experimental ({γ},e) and (e,2e) spectra.