Quasielastic scattering and breakup angular distributions for the neutron halo nucleus ${}^{11}\mathrm{Be}$ on a ${}^{208}\mathrm{Pb}$ 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 ${}^{11}\mathrm{Be}$ 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 ${}^{10}\mathrm{Be}$ 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)]. The reduced reaction cross section of the ${}^{11}\mathrm{Be}+{}^{208}\mathrm{Pb}$ 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 ${}^{208}\mathrm{Pb}$) at relatively high incident energies is still sensitive to the structure of neutron-rich nuclei.

• Received 13 January 2022
• Accepted 25 February 2022

DOI:https://doi.org/10.1103/PhysRevC.105.034602