Angular distributions for the reaction ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}(\gamma , p){}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ are presented from 21 to 32.5 MeV. The asymmetry coefficients $A_1$ and $A_3$ increase to a maximum at 30 MeV and indicate a broad quadrupole state centered near 27 MeV.

• Received 20 March 1969

DOI:https://doi.org/10.1103/PhysRevLett.23.323