The differential cross section for the ${}_{}{}^{16}{}_{}{}^{}(\gamma$,p${)}^{15}$N process has been measured in the energy range $E_{\gamma }$=100–400 MeV at laboratory angles of 45°, 90°, and 135°. The cross sections for the (γ,p) reaction leaving ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ in its ground state, in its first and second excited states at $E_x$≊5.3 MeV, and in its third excited state at $E_x$=6.3 MeV were extracted from the tip region of the proton spectra measured at a series of bremsstrahlung end point energies. The data are compared with calculations based on a direct, single-particle knockout mechanism and on mechanisms involving two particles in an intermediate state.

• Received 26 December 1984

DOI:https://doi.org/10.1103/PhysRevC.31.1633