Elastic Scattering of Protons fromMg24

The differential scattering cross section has been determined for protons scattered elastically from ${\mathrm{Mg}}^{24}$ at a laboratory angle of 164°±5°. The targets consisted of thin ${\mathrm{Mg}}^{24}$ ${\mathrm{F}}_2$ films evaporated onto thick graphite. Protons scattered elastically from ${\mathrm{Mg}}^{24}$ were selected by a 90° magnetic analyzer and were counted by a proportional counter. At least nine anomalies occur in the cross section between 0.40 Mev and 3.95 Mev, indicating the excitation of nine levels of the compound nucleus, ${\mathrm{Al}}^{25}$. At several of the resonances, competing reaction cross sections have been shown to be relatively small.