Isomer Ratios in Photonuclear Reactions With Multiple Neutron Emission

The aim of this work is studying of gamma-quanta energy dependence ofisomeric ratios in A(³,xn)^m,g(A " r n) reactions in energy range35...100MeV , i.e. beyond Great Dipole Resonance (GDR) region.Experimental data were taken from international database EXFOR for awide range of nuclear mases (55 < A < 181). Theoretical values ofisomeric ratios were obtained using TALYS-1.8 code. Several models oflevel densities with both enabled and disabled pre-equilibriummechanism were considered in our simulations. Obtained results let usto make conclusions about diuerent mechanisms of photonuclear reactionson certain nuclei, energy dependence of their relative contribution.