Pronounced periodic structure has been observed in the inelastic scattering of ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ on ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ for energies between 10 MeV and 23.6 MeV (center of mass). A similar effect is also seen in the ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ + ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ reaction.

• Received 12 December 1977

DOI:https://doi.org/10.1103/PhysRevLett.40.927