Excitation Functions for Proton Reactions with Sodium and Magnesium

Proton bombardment at energies up to 120 Mev have been carried out on the Harvard University cyclotron using targets of ${\mathrm{Na}}^{23}$N${\mathrm{O}}_3$, ${\mathrm{Mg}}^{25}$O, ${\mathrm{Mg}}^{26}$O, and ordinary MgO. A stacked sample and absorber technique was employed, using the formation of ${\mathrm{C}}^{11}$ from interleaved polyethylene foils as a monitor. The internal scattered beam at about 180° from the scatterer and 1 inch below the median plane was employed to give better energy resolution. Absolute excitation curves have been obtained for the reactions yielding ${\mathrm{F}}^{18}$ and ${\mathrm{Na}}^{24}$ from ${\mathrm{Mg}}^{25}$ and ${\mathrm{Mg}}^{26}$, ${\mathrm{F}}^{18}$ from ${\mathrm{Mg}}^{24}$, and ${\mathrm{F}}^{18}$ and ${\mathrm{Na}}^{22}$ from ${\mathrm{Na}}^{23}$.