Excitation functions of the reaction ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$${(}^{12}$C,α${)\mathrm{}}^{20}$Ne have been measured in energy steps of 25 and 12.5 keV from $E_{\mathrm{c}.\mathrm{m}.\mathrm{}=5.7\mathrm{}}$ to 6.1 MeV at 18 angles between ${\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}=5\mathrm{}}$° and 90°. A recently published method for the determination of the true S-matrix elements of a reaction including only spinless particles was applied to the ${\alpha }_0$ exit channel. All quasimolecular resonances previously reported in the energy range studied were confirmed and spin assignments are made.

• Received 2 January 1985

DOI:https://doi.org/10.1103/PhysRevC.32.910