Abstract
The excitation function of (\ensuremath{\alpha},xn) reactions on $^{191}\mathrm{Ir}$ (abundance 37.3%) and on $^{193}\mathrm{Ir}$ (abundance 62.7%) has been measured for the 17--55 MeV alpha-particle bombarding energy range. The stacked foil activation technique and \ensuremath{\gamma}-ray spectroscopy were used to determine the cross sections. The experimental data were compared with calculated values obtained by means of a geometry-dependent hybrid model. The initial exciton number ${\mathit{n}}_{0}$=4 with n=2, p=2, and h=0 gives the best agreements with the presently measured results. To calculate the excitation function theoretically a computer code was used. This set of excitation functions provides a data basis for probing the validity of combined equilibrium and preequilibrium reaction models in a considerable energy range.
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