Analysis of isomeric ratios in (γ, n) and (γ, p) reactions around giant-resonance energies

Abstract

Isomeric ratios are investigated in simple photonuclear reactions occurring on targets in the mass range 90–180 amu that are irradiated with 20-to 40-MeV photons. The results of measurements are compared with estimates based on the statistical model of deexcitation of compound nuclei. The isomeric ratios in question are calculated with allowance for special features of photonuclear reactions induced by bremsstrahlung photons and for the properties of nuclear transitions in residual products. The results of these calculations, involving no free parameters, agree satisfactorily with experimental data.