Many-body perturbation theory summary

Abstract A consistent relativistic energy approach to the calculation of probabilities of cooperative electron-gamma-nuclear processes is developed. The nuclear excitation by electron transition (NEET) effect is studied. The NEET process probability and cross section are determined within the S-matrix Gell-Mann and Low formalism (energy approach) combined with the relativistic many-body perturbation theory (PT). Summary of the experimental and theoretical works on the NEET effect is presented. The calculation results of the NEET probabilities for the y Os, yy Ir, and yg Au atoms are presented and compared with available experimental and alternative theoretical data. The theoretical and experimental study of the cooperative electron-gamma-nuclear process such as the NEET effect is expected to allow the determination of nuclear transition energies and the study of atomic vacancy effects on nuclear lifetime and population mechanisms of excited nuclear levels. 

The plan of this report is as follows in Section 2 an overview of the most important theoretical aspects of the second-order many-body perturbation theory is given. Section 3 contains a review of the numerous applications of the second-order theory in its MP2 form which were published during the period Jime 1999 to May 2001. The final section then contains a brief summary and a discussion of prospects. 

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