Differential cross sections and analyzing powers for $0^{-}$ states in ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ have been measured in inelastic scattering of 65 MeV polarized protons. This is the first observation of both isovector and isoscalar $0^{+}$${\to 0}^{-}$ transitions in proton scattering on a particular isotope. Microscopic distorted-wave Born approximation and distorted-wave impulse approximation calculations do not describe very well either experimental cross sections or analyzing powers. It is suggested that more complicated reaction mechanisms and wave functions may be needed to describe these transitions.

• Received 3 April 1984

DOI:https://doi.org/10.1103/PhysRevC.30.746