Photonuclear Yields ofN17

Yields of ${\mathrm{N}}^{17}$ from several elements have been measured as functions of electron energy and converter thickness for bombardments from the Stanford linear electron accelerator. After correction for the electron-produced part of the yield, the ${\mathrm{O}}^{18}(\gamma , p)$ and ${\mathrm{F}}^{19}(\gamma , 2p)$ yields can be fitted (within statistics) to isochromats characteristic of 25- and 40-Mev photon energies, indicating integrated cross sections of 0.067 and 0.0037 Mev barn, respectively.