Abstract
The entrance channel optical potentials for $(\ensuremath{\alpha},2\ensuremath{\alpha})$ reactions are calculated using single folding models. These are found to be much different from the conventional entrance channel potentials and use of these folded entrance channel optical potentials significantly change the absolute cross sections. Small reductions in the entrance channel potentials are found to increase the peak to dip cross section ratios drastically for the knockout of \ensuremath{\alpha}-clusters bound in the $\ensuremath{\ell}=1$ state.
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