Two independent measurements of the ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$(γ,n) reaction cross section have been made using both an enriched-gas target, and one of ${(}^{15}$${\mathrm{NH}}_4$${)}_2$${\mathrm{SO}}_4$. The results are self-consistent, but reveal discrepancies with an earlier measurement of this cross section, particularly in the giant dipole resonance region, and with a measurement of the ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$(γ,$n_0$) cross section. These discrepancies are discussed and in general resolved. The results are used in conjunction with other isospin-selective reactions data on ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ to elucidate the isospin distribution of E1 states in ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$.

• Received 15 September 1988

DOI:https://doi.org/10.1103/PhysRevC.40.506