Reactions induced by the halo nucleus 6He at energies around the Coulomb barrier

The reaction He-6+Zn-64 was studied in order to investigate the effects of the projectile neutron-halo structure on the reaction mechanism at energies around the Coulomb barrier. Elastic scattering angular distributions, transfer/breakup angular distributions, and fusion excitation functions have been measured. Due to the low-recoil energy of the evaporation residues and the low intensity of the He-6 beam, the fusion cross section was measured by detecting off-line the atomic x-ray emission which follows the electron capture decay of the evaporation residues. For comparison the reaction He-4+Zn-64 was studied using the same technique. The data for the reaction He-6+Zn-64 show that the transfer and breakup mechanisms account for almost 80% of the total reaction cross section, moreover we do not observe an enhancement of the fusion cross section when compared with the He-4+Zn-64 reaction.

The reaction 6He+64Zn was studied in order to investigate the effects of the projectile neutron-halo structure on the reaction mechanism at energies around the Coulomb barrier. Elastic scattering angular distributions, transfer/breakup angular distributions, and fusion excitation functions have been measured. Due to the lowrecoil energy of the evaporation residues and the low intensity of the 6He beam, the fusion cross section was measured by detecting off-line the atomic x-ray emission which follows the electron capture decay of the evaporation residues. For comparison the reaction 4He+64Zn was studied using the same technique. The data for the reaction 6He+64Zn show that the transfer and breakup mechanisms account for almost 80% of the total reaction cross section, moreover we do not observe an enhancement of the fusion cross section when compared with the 4He+64Zn reaction.