Abstract

GOMES, P.R.S. et al. Fusion, break-up and scattering of weakly bound nuclei. Rev. mex. fis. [online]. 2006, vol.52, suppl.4, pp.23-29. ISSN 0035-001X.

We discuss the influence of the break-up process of stable weakly bound nuclei on the fusion cross section and on the elastic scattering at near barrier energies. The complete fusion for heavy targets is found to be suppressed at energies above the barrier, whereas this effect is negligible for light targets. The total fusion cross sections are not affected by the break-up process. The non capture break-up is the dominant process at sub-barrier energies, with significant cross sections also at energies close and above the Coulomb barrier. We also show that the break-up process is responsible for the vanishing of the usual threshold anomaly of the optical potential and give rise to a new type of anomaly, named break-up threshold anomaly (BTA).

Keywords : Break-up process; fusion cross sections; break-up threshold anomaly.