The inelastic scattering of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ has been studied on targets of ${}_{}{}^{40,42,44}{}_{}{}^{}\mathrm{Ca}$ at 60 MeV, and ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$ at 56 MeV incident energy. Oxygen-16 ions emerging from the reactions were momentum analyzed in a split-pole magnetic spectrograph and identified in the focal plane by a position-sensitive ionization chamber. Angular distributions were extracted for transitions of multipolarity $L=0-5\mathrm{}$ to final states with excitation energies below 5 MeV. In most cases single-channel distorted-wave Born approximation calculations fail to reproduce the data, the discrepancies tending to increase with higher multipolarity. Coupled-channels calculations that explicitly treat the strong couplings connecting all final states observed show improved, though not fully satisfactory, agreement with the data.

NUCLEAR REACTIONS ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + ${}_{}{}^{40,42,44}{}_{}{}^{}\mathrm{Ca}$, $E_{\mathrm{lab}}=60\mathrm{}$ MeV; ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$, $E_{\mathrm{lab}}=56\mathrm{}$ MeV; elastic and inelastic scattering; measured $\sigma \left(\theta \right)$; DWBA and coupled channels calculations.

• Received 16 September 1981

DOI:https://doi.org/10.1103/PhysRevC.25.1915