Excitation functions for (p,n) reactions onBr79andI127

Excitation functions for the ${}_{}{}^{79}{}_{}{}^{}\mathrm{Br}\mathrm{}(p,n)\mathrm{}{}_{}{}^{79}{}_{}{}^{}\mathrm{Kr}$ and ${}_{}{}^{127}{}_{}{}^{}\mathrm{I}\mathrm{}(p,n)\mathrm{}{}_{}{}^{127}{}_{}{}^{}\mathrm{Xe}$ reactions have been determined from 3 to 25 MeV by the activation method. KBr and KI targets of natural isotopic abundances were encapsulated in Mylar to prevent escape of the gaseous ${}_{}{}^{79}{}_{}{}^{}\mathrm{Kr}$ and ${}_{}{}^{127}{}_{}{}^{}\mathrm{Xe}$. Disintegration rates were obtained by assaying selected $\gamma$ rays with calibrated Ge (Li) detectors; beam intensities were determined with a Faraday cup. The measured absolute cross sections have uncertainties of less than 10% with energy uncertainties of ≲ 100 keV. The excitation functions are compared to Monte Carlo calculations based on an intranuclear-cascade statistical-evaporation model.