Activation cross sections and isomeric cross section ratios for the (n,2n) reactions on 175Lu, 198Pt and 82Se from 13.5 to 14.6 MeV

The cross sections for the 175Lu(n,2n)174m,gLu, 198Pt(n,2n)197m,gPt and 82Se(n,2n)81m,gSe reactions and their isomeric cross section ratios σm/σg have been measured in the neutron energy range of 13.5–14.6 MeV using the activation technique. Nuclear model calculations using the code HFTT, which employs the Hauser–Feshbach (statistical model) and exciton model (precompound effects) formalisms, were undertaken to describe the formation of the products. The total cross sections for the (n,2n) reaction on 175Lu, 198Pt and 82Se are compared with experimental data found in the literature, with results of published empirical formulae, and with values of model calculations including the pre-equilibrium contribution.