Competition of photoneutron and photoproton channels in photodisintegration of atomic nuclei

A model for describing the ratios of integrated cross sections of the $(\gamma, Xn)$ and $(\gamma,p)$ reactions for $10<A<150$ nuclei is presented. The model is based on a phenom.enological parametrization of the main formation and decay mechanisms of giant dipole resonance using all available experimental data in the $10<E_{\gamma}<30$ MeV energy range. Within the measurement accuracy of about $(\sim30\%)$ the ratios of experimentally measured integrated cross sections of the $(\gamma, Xn)$ and $(\gamma, p)$ reactions are reproduced.