Photo-induced nuclear excitation by electron transition

We described the nuclear excitation at electron transition (NEET), induced by x-rays, on the basis of strict collision theory. All stages of the process are considered, including formation of the hole in the electronic K-shell, its decay accompanied by excitation of the nucleus, filling of the M-vacancy and subsequent deexcitation of the nucleus. The cross sections for the NEET and photoabsorption of x-rays near K-edge are calculated. The results agree with the data of Kishimoto et al.