Abstract
We analyze the energy dependence of the interacting optical potential, at near barrier energies, for two systems involving the weakly bound projectile and the heavy and targets, by the simultaneous fit of elastic scattering angular distributions and fusion excitation functions. The approach used consists of dividing the optical potential into two parts. A short-range potential that is responsible for fusion, and a superficial potential for direct reactions. It is found, for both systems studied, that the fusion imaginary potential presents the usual threshold anomaly (TA) observed in tightly bound systems, whereas the direct reaction imaginary potential shows a breakup threshold anomaly (BTA) behavior. Both potentials satisfy the dispersion relation. The direct reaction polarization potential predominates over the fusion potential and so a net overall behavior is found to follow the BTA phenomenon.
- Received 27 February 2015
DOI:https://doi.org/10.1103/PhysRevC.91.044610
©2015 American Physical Society