Elastic scattering and reaction mechanisms of the halo nucleus 11Be around the Coulomb barrier

Collisions induced by 9,10,11Be on a 64Zn target at the same c.m. energy were studied. For the first time,strong effects of the 11Be halo structure on elastic-scattering and reaction mechanisms at energies near the Coulomb barrier are evidenced experimentally. The elastic-scattering cross section of the 11Be halo nucleus shows unusual behavior in the Coulomb-nuclear interference peak angular region. The extracted total-reaction cross section for the 11Be collision is more than double the ones measured in the collisions induced by 9,10Be. It is shown that such a strong enhancement of the total-reaction cross section with 11Be is due to transfer and breakup processes.

Collisions induced by Be-9,Be-10,Be-11 on a Zn-64 target at the same c. m. energy were studied. For the first time, strong effects of the Be-11 halo structure on elastic-scattering and reaction mechanisms at energies near the Coulomb barrier are evidenced experimentally. The elastic-scattering cross section of the Be-11 halo nucleus shows unusual behavior in the Coulomb-nuclear interference peak angular region. The extracted total-reaction cross section for the Be-11 collision is more than double the ones measured in the collisions induced by Be-9,Be-10. It is shown that such a strong enhancement of the total-reaction cross section with Be-11 is due to transfer and breakup processes.