Abstract

$^{12}\mathrm{C}$ + $^{20}\mathrm{Ne}$ elastic-scattering angular distributions have been measured at several energies, and an excitation function has been obtained at 70\ifmmode^\circ\else\textdegree\fi{} center of mass from ${E}_{\mathrm{c}.\mathrm{m}.}=17 \mathrm{to} 2.8$ MeV. The $^{12}\mathrm{C}$ + $^{20}\mathrm{Ne}$ data are greatly damped compared with $^{16}\mathrm{O}$ + $^{16}\mathrm{O}$ data in this energy range. This demonstrates that the absorption is not determined primarily by compound-nuclear properties. The differences are interpreted in terms of the more favorable angular-momentum matching conditions for the $^{12}\mathrm{C}$ + $^{20}\mathrm{Ne}$ direct-reaction channels.

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