Reaction cross sections for ^{8}B, ^{7}Be, and ^{6}Li+^{58}Ni near the Coulomb barrier: Proton-halo effects

Elastic scattering of B-8, Be-7, and Li-6 on a Ni-58 target has been measured at energies near the Coulomb barrier. Optical-model fits were made to the experimental angular distributions, and total reaction cross sections were deduced. A comparison with other systems provides striking evidence for proton-halo effects on B-8 reactions. As opposed to the situation for the neutron-halo nucleus He-6, for which particle transfer dominates, the "extra" cross section observed for B-8 appears to result entirely from projectile breakup.