Interactions of 7.5-Mev Protons with Copper and Vanadium

The separate cross sections for interaction of 7.5-Mev protons have been measured for natural copper and vanadium. Angular distributions for elastic scattering are presented. The (inelastic scattering+alpha emission) cross sections are: copper, 266 mb, and vanadium, 134 mb. The ($p, n$) reaction cross sections are: ${\mathrm{Cu}}^{65}$, 537 mb, and ${\mathrm{V}}^{51}$, 555 mb. These data, along with separate measurements of polarization from copper, are compared with optical-model computations. The results indicate a volume-absorption potential rather than a surface-absorption potential.