Abstract
The extended optical model is used to simultaneously analyze the elastic scattering and fusion data for the weakly-bound system of 9Be + 12C in the low-energy region. Dynamic polarization potentials UF, UD, associated with fusion and direct couplings, respectively, are introduced. Corresponding fitting parameters leading to dispersive potentials are found, which provide good simultaneous descriptions of elastic and fusion data. The energy-dependent behavior of the polarization potentials establishes a striking difference with respect to that observed for weakly bound projectiles, including 9Be, on medium- and heavy-mass targets. Contrary to similar analyses made on weakly-bound systems, the real part of UD is found to be attractive in the present case. The observed behavior is discussed.
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