Activation cross sections and isomeric cross section ratios for the (n,2n) reactions on Lu, Pt and Se 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 σ_m/σ_g 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.