Evidence is presented for populating the ${12}^{+}$ and ${14}^{+}$ members of the excited ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ +${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ rotational band in ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$ by the ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ +${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ entrance channel. Excitation functions of the ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}({}_{}{}^{14}{}_{}{}^{}\mathrm{N},\alpha ){}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ reaction close to 0° and 180° near the Coulomb barrier exhibit pronounced resonances and forward-backward cross-section asymmetries at the energies of these two ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ +${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ resonances.

NUCLEAR REACTIONS ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}({}_{}{}^{14}{}_{}{}^{}\mathrm{N},\alpha )$, $E=9\mathrm{}-24$ MeV; measured $\sigma \mathrm{}\left(E\right)\mathrm{}$ close to 0° and 180°; deduced energies and widths of intermediate structures in ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$.

• Received 7 April 1977

DOI:https://doi.org/10.1103/PhysRevC.16.2291