Excitation functions for the yields of eight residual nuclides from the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ reaction have been measured over the range $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=15-29\mathrm{}$ MeV using $\gamma$-ray techniques. Weak oscillatory structure in the fusion-evaporation yield is observed, with maxima near $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=20, 22, \mathrm{and} 23$ MeV. Two strong anomalies in the inelastic scattering and $\alpha$-transfer channels have been located at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=19.9\mathrm{} \mathrm{and} 25.4$ MeV. These structures have properties similar to those of characteristic resonances in other light systems. The $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=19.9\mathrm{}$ MeV resonance occurs at the same ${}_{}{}^{36}{}_{}{}^{}\mathrm{Ar}$ excitation energy as a similar resonance previously observed in the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ + ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$ reaction yields.

NUCLEAR REACTIONS ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$,$x$); $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=15-29\mathrm{}$ MeV; measured excitation functions for the production of $A=20-34\mathrm{}$ reaction products; observed structure at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=19.9, 22.0, 22.8, \mathrm{and} 25.4$ MeV; deduced critical angular momentum for fusion.

• Received 9 October 1981

DOI:https://doi.org/10.1103/PhysRevC.25.2457