Identification an Yields of ((γ,αn) Reactions

The ($\gamma ,\alpha n$) reaction was studied in several nuclides by irradiation with photons of 50- and 87-Mev maximum energy from the betatron. By use of radiochemical techniques it was shown that ${\mathrm{C}}^{11}$ is produced from oxygen, ${\mathrm{F}}^{18}$ from sodium, ${\mathrm{P}}^{30}$ and ${\mathrm{P}}^{32}$ from chlorine, ${\mathrm{Ga}}^{70}$ from arsenic, ${\mathrm{As}}^{74}$ and ${\mathrm{As}}^{76}$ from bromine, and ${\mathrm{Zr}}^{87}$ from molybdenum. Except for ${\mathrm{P}}^{32}$, it is proposed that these nuclides are produced by the ($\gamma ,\alpha n$) reaction. The yields of these nuclides relative to ${\mathrm{N}}^{13}$ from the ${\mathrm{N}}^{14}(\gamma ,n){\mathrm{N}}^{13}$ reaction and those of other nuclides observed in this study are given.