Interaction ofU238with 300- and 11.5-GeV protons: Cross sections and recoil properties in theA∼130mass region

Formation cross sections and thick-target recoil properties of 13 products in the $A\sim 130$ mass region from the interaction of ${}_{}{}^{238}{}_{}{}^{}\mathrm{U}$ with 300- and 11.5-GeV protons have been determined. The values of $\frac{{\sigma }_{300}}{{\sigma }_{11.5}}$ are consistent with unity for $A>\mathrm{}130\mathrm{}$ and decrease with decreasing $A$ below this mass number, a trend that is most notably exhibited by neutron deficient iodine nuclides. The recoil ranges and $\frac{F}{B}$ values are essentially the same at both energies.