Estudo do espalhamento elástico com feixes exóticos no regime de baixas energias

Abstract

In this work, elastic scattering measurements were performed for the 6He + 197Au system at the energies ELab = 18.0, 21.8, and 23.0 MeV, close to the Coulomb barrier (ELab = 19.11 MeV). The angular distributions were analyzed using Woods–Saxon optical potentials, the S˜ao Paulo Potential (SPP), and four-body CDCC calculations, also performed at the energy of 27.0 MeV. Experimental data available in the literature were also analyzed for the systems 6He+ 51V (15.4 and 23.0 MeV), 7Be+51V (26.0 MeV), and 8Li+51V (18.5 and 26.0 MeV), aiming to investigate effects associated with weakly bound nuclei. All experimental measurements were performed at the Radioactive Ion Beams in Brazil (RIBRAS) system, installed at the Pelletron Laboratory of the Institute of Physics of the University of S˜ao Paulo. The results obtained from the 4B-CDCC calculations evidenced the importance of coupling effects associated with the halo nature of the 6He nucleus. The experimental data for the 7Be + 51V system were satisfactorily reproduced by the S˜ao Paulo Potential. On the other hand, the results for the 8Li+51V system demonstrated the relevance of the transfer channel for the description of this interaction.