Photonuclear Reactions on Natural Mixture of Selenium

The method of induced activity was used to study photonuclear reactions on natural mixture of selenium isotopes. This study measured the yields of the radionuclides ^73g Se, ^73m Se, ^73g+m Se, ^79m Se, ^81g Se, ^81m Se, ^81g+m As, ^72 As, ^73 As, ^74 As, ^76 As, ^77 As, ^78 As, and ^79 As produced in ^nat Se( γ,xnyp ) multiparticle reactions with bremsstrahlung end-point energy of 55 MeV. The bremsstrahlung radiation was generated using the RM-55 electron accelerator at the Skobeltsyn Institute of Nuclear Physics, Moscow State University, and the reaction yields were derived from the induced activities measured using off-line γ -ray spectrometry. The measurement of the production yields for the radionuclides produced in the photoproton reactions on natural selenium is the first of its kind. The experimentally obtained yields of photonuclear reactions are compared with the yields calculated using theoretical cross-sections of photonuclear reactions within the combined model of photonuclear reactions and the TALYS program code.