Excitation functions for (p,n) reactions to 25 MeV onCu63,Cu65, andAg107

Abstract

Absolute cross sections for the ($p,n$) reactions on ${}_{}{}^{63}{}_{}{}^{}\mathrm{Cu}$, ${}_{}{}^{65}{}_{}{}^{}\mathrm{Cu}$, and ${}_{}{}^{107}{}_{}{}^{}\mathrm{Ag}$ at proton energies from 2.5 to 25 MeV were determined by the activation method. Metal foil targets of natural isotopic abundance were used; therefore, the results for ${}_{}{}^{63}{}_{}{}^{}\mathrm{Zn}$ above 22.3 MeV and for ${}_{}{}^{107}{}_{}{}^{}\mathrm{Cd}$ above 18.8 MeV include contributions from ($p,3n$) reactions. Beam intensities were measured with a Faraday cup. Disintegration rates of the product nuclei were determined by assaying their $\gamma$ rays with calibrated Ge(Li) detector systems. Comparisons of the present cross sections are made with a complete compilation of previous measurements and with calculations based on a Monte Carlo intranuclear-cascade-statistical-evaporation model. Half-lives for ${}_{}{}^{63}{}_{}{}^{}\mathrm{Zn}$ and ${}_{}{}^{107}{}_{}{}^{}\mathrm{Cd}$ were determined to be 38.0 ± 0.1 min and 6.50 ± 0.02 h, respectively.