4 papers
The nonrelativistic limit of the second order S-matrix element for the elastic scattering of photons by K-shell bound electrons
A. Costescu, S. Spanulescu, C. Stoica
In this paper, the right expressions of the fully nonrelativistic K-shell Rayleigh scattering amplitudes and cross-sections are obtained by using the Coulomb Green function method.…
The total cross-sections for the photoeffect for 2S-subshell bound electrons and pair production with the created electron in the 2S subshell for photon energies above 1 MeV
A. Costescu, S. Spanulescu, C. Stoica
Considering the contributions of the main term of the relativistic Coulombian Green function given by Hostler [J. Math. Phys, 5, 591 (1964)] to the second order of the S-matrix ele…
The total cross-sections for the photoeffect for K-shell bound electrons and pair production with the created electron in the ground state for photon energies above 1 MeV
A. Costescu, S. Spanulescu, C. Stoica
Considering the contributions of the main term of the relativistic Coulombian Green function given by Hostler to the second order of S matrix element and taking into account only t…
Multipolar radiation and the gauge invariant reduction of multipole tensors
Constantin Vrejoiu, Cristian Stoica
Compact general formulae for the energy, momentum and angular momentum radiated by confined systems of charges and currents are presented in terms of their multipole Cartesian tens…