Isomeric ratios of the products of (γ, xnp) reactions on 90,91Zr nuclei for a maximum bremsstrahlung energy of 84 MeV

We present the results from measuring and calculatoffing the isomeric ratios for the 87m,g Y nucleus produced in the 90Zr(γ, 2np)87g,m Y and 91Zr(γ, 3np)87g,m Y reactions, and for the 86m,g Y nucleus produced in the 90Zr(γ, 3np)86g,m Y and 91Zr(γ, 4np)86g,m Y reactions. The method of measuring the induced activity of irradiated samples with a semiconductor spectrometer based on an HPGe detector with a relative efficiency of 20% and an energy resolution of 1.9 keV for the 1332 keV 60Co line was used to determine the isomeric ratios. The obtained results are compared to calculations using the TALYS code, employing statistical and preequilibrium model approaches.