Electrostatic analysis of incident and product particles has been used to measure the following reaction energies: ${\mathrm{Na}}^{23}(p, \alpha ){\mathrm{Ne}}^{20}$ (2.379±0.003 Mev); ${\mathrm{Na}}^{23}(p, \alpha ){\mathrm{Ne}}^{20*}$ (0.745±0.002); ${\mathrm{Na}}^{23}(p, p^{\prime }){\mathrm{Na}}^{23*}$ (-0.439±0.001 Mev); ${\mathrm{Mg}}^{24}(p, p^{\prime }){\mathrm{Mg}}^{24*}$ (-1.371±0.002 Mev); ${\mathrm{Al}}^{27}(p, p^{\prime }){\mathrm{Al}}^{27*}$ (-0.843±0.002 Mev); ${\mathrm{Al}}^{27}(p, \alpha ){\mathrm{Mg}}^{24}$ (1.594±0.002 Mev); ${\mathrm{Al}}^{27}(p, \alpha ){\mathrm{Mg}}^{24*}$ (0.228±0.003 Mev).

• Received 27 October 1952

DOI:https://doi.org/10.1103/PhysRev.89.824