Comparing real bremsstrahlung photons from electrons and positrons and virtual photons in electron-nuclear and positron-nuclear reactions for studies of giant resonances

The validity of determining the contributions attributable to bremsstrahlung photons from positrons using data with bremsstrahlung photons from electrons for identical radiators when studying E1 giant resonance by means of quasimonochromatic annihilation photons is confirmed. Photonuclear reactions induced by bremsstrahlung photons and electrons or positrons are compared with one another to determine the possibility of isolating the contributions from isovector E1 and E2 giant resonances.