Abstract
Total (n,2n) cross sections at 14.6+or-0.3 MeV for the 84Sr, 86Sr, 88Sr, 93Nb, 113In, 134Ba and 136Ba targets were measured using the activation technique and a Ge(Li) detection system. Isomeric cross section ratios were calculated on the basis of the statistical theory using the shifted Fermi-gas and superconductivity models. Theoretical results are compared with experimental data. In several cases (88Sr, 93Nb, 109Ag, 134Ba, 136Ba and 138Ba) it was not possible to measure total cross sections, and therefore the theoretical prediction of the isomeric cross section ratio was used to determine the total (n,2n) cross section. The cross section data obtained in this work and other recent literature data are analysed in terms of the neutron excess of residual nuclei (N-Z)R at a constant value of the residual excitation energy.
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