Elastic scattering and breakup reactions of neutron-rich nucleus Be 11 on Pb 208 at 210 MeV

Quasielastic scattering and breakup angular distributions for the neutron halo nucleus Be11 on a Pb208 target at the laboratory energy of 210 MeV, which corresponds to 5.2 times the Coulomb barrier, were measured at HIRFL-RIBLL (Heavy-Ion Research Facility in Lanzhou and Radioactive Ion Beam Line in Lanzhou). The quasielastic scattering angular distribution of Be11 shows an obvious suppression of the Coulomb nuclear interference peak (CNIP) even at such a high incident energy. Theoretical results with the continuum discretized coupled channels (CDCC) method are in correspondence with the experimental data. The measured angular distribution of the Be10 fragments is well reproduced considering elastic breakup contribution with the CDCC calculations plus nonelastic breakup contribution with the model of Ichimura, Austern and Vincent [Phys. Rev. C 32, 431 (1985)0556-281310.1103/PhysRevC.32.431]. The reduced reaction cross section of the Be11+Pb208 system was compared with those of other reaction systems including tightly and weakly bound projectiles impinging on medium and heavy mass targets, where the former shows a significant enhancement. Systematical comparisons between the experimental data and theoretical calculations suggest that elastic scattering with heavy targets (such as Pb208) at relatively high incident energies is still sensitive to the structure of neutron-rich nuclei.