Gamma-ray studies ofC12+Ne20reactions

Excitation functions for the yields of ten residual nuclides from the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$+${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ reaction have been measured over the range $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=11-33\mathrm{}$ MeV in steps of 150 keV, using $\gamma$-ray techniques. The magnitude and energy dependence of the excitation functions for most partial yields, as well as for the total fusion yield, closely resemble those from the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$+${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ system when compared at the same compound-nuclear excitation energy. The total fusion yield exhibits strong anomalies at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=22.7\mathrm{} \mathrm{and} 24.1$ MeV, while the ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ inelastic scattering yield exhibits a strong uncorrelated structure at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=21.1\mathrm{}$ MeV. In addition weaker structure is seen at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=13.6, 16.6, 18.6, \mathrm{and} 26.3$ MeV in the total fusion yield. The 24.1 MeV resonance corresponds to a characteristic structure in the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$+${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ reaction yields. Both structures appear at the same ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$ excitation energy and are found to be correlated with the transition to a regime of limited fusion.