Abstract
We have measured the angular distributions of the reaction $^{12}\mathrm{C}$($^{16}\mathrm{O}$, $^{20}\mathrm{Ne}$)$^{8}\mathrm{Be}$ in the c.m. energy range 12.22 to 15.07 MeV. The data and analysis, indicate a broad (${\ensuremath{\Gamma}}_{1}\ensuremath{\simeq}650$ keV) $L=8$ resonancelike structure centered at ${E}_{1}\ensuremath{\simeq}13.15$ MeV. The severe damping of the $L=8$ structure of the angular distribution and the deep minimum in the integrated cross section at ${E}_{2}\ensuremath{\simeq}13.7$ MeV appear to be due to interference between the broad resonance at ${E}_{1}$ and a narrow (${\ensuremath{\Gamma}}_{2}\ensuremath{\simeq}100$ keV) $L=8$ resonance at ${E}_{2}$. This interpretation is consistent with two-level $R$-matrix fits.
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