TheMg24(γ, 3p3n)F18Reaction Induced by 70-Mev Bremsstrahlung

${\mathrm{F}}^{18}$ was identified among the products of an irradiation of Mg by 70-Mev bremsstrahlung by means of its chemical and radioactive properties. Considering the ${\mathrm{F}}^{18}$ to be formed solely by the loss of six nucleons from ${\mathrm{Mg}}^{24}$, the yield of the process ${\mathrm{Mg}}^{24}+\gamma \to {\mathrm{F}}^{18}$ was 0.042 on the basis of unity for ${\mathrm{N}}^{14}+\gamma \to {\mathrm{N}}^{13}+n$. Preliminary experiments have indicated that 70-Mev bremsstrahlung gives the processes ${\mathrm{Ca}}^{40}+\gamma \to {\mathrm{Cl}}^{34}$ and ${\mathrm{Cl}}^{35,37}+\gamma \to {\mathrm{Si}}^{31}$.