Activation cross sections were measured for the nucleides ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$, ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{13}{}_{}{}^{}\mathrm{N}$, ${}_{}{}^{18}{}_{}{}^{}\mathrm{F}$, ${}_{}{}^{22}{}_{}{}^{}\mathrm{Na}$, and ${}_{}{}^{24}{}_{}{}^{}\mathrm{Na}$ formed by the interaction of 300 GeV protons with aluminum. The measurements were made relative to the production of ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$ in polyethylene and graphite foils. The cross section ratios are the same within experimental error as those observed at 28 GeV.

NUCLEAR REACTIONS Al($p$,$x$)${}_{}{}^7{}_{}{}^{}\mathrm{Be}$, ${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{13}{}_{}{}^{}\mathrm{N}$, ${}_{}{}^{18}{}_{}{}^{}\mathrm{F}$, ${}_{}{}^{22}{}_{}{}^{}\mathrm{Na}$, ${}_{}{}^{24}{}_{}{}^{}\mathrm{Na}$, $E=300\mathrm{}$ GeV; measured $\sigma$ relative to ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$($p$,$\mathrm{pn}$)${}_{}{}^{11}{}_{}{}^{}\mathrm{C}$.

• Received 11 October 1978

DOI:https://doi.org/10.1103/PhysRevC.19.962