Gamma rays emitted following the interaction of 230-MeV negative pions with 16O

γ rays have been detected from 230-MeV negative pions incident on a water target. De-excitation γ rays from ¹⁰B, ¹²C, ¹³C, ¹⁴C, ¹⁴N, ¹⁵N, ¹⁵O, ¹⁶O, and ¹⁶N have been identified and cross sections for excitation of particular residual states determined. Where necessary, the cross sections have been corrected for γ feeding from higher states. Decays from short lived nuclear states result in Doppler broadened peaks which yield nuclear recoil momenta.NUCLEAR REACTIONS ¹⁶O(π⁻,γ X), E=230 MeV, measured relative γ yields at θ=90°.