  Understanding of $\gamma$-ray production via neutron interactions on oxygen
is essential for the study of neutrino neutral-current quasielastic
interactions in water Cherenkov detectors. A measurement of $\gamma$-ray
production from such reactions was performed using a 77~MeV quasi-monoenergetic
neutron beam. Several $\gamma$-ray peaks, which are expected to come from
neutron-${\rm ^{16}O}$ reactions, are observed and production cross sections
are measured for nine $\gamma$-ray components of energies between 2 and 8~MeV.
These are the first measurements at this neutron energy using a nearly
monoenergetic beam.
