Calculations of reaction cross sections for C-19 at relativistic energies

Few-body Glauber theory calculations of reaction cross sections for the pro posed single neutron halo nucleus C-19 are presented for an incident energy of 960 MeV/nucleon on a C-12 target. The calculated reaction cross section s are shown to be significantly smaller than those obtained using the optic al limit approximation to the Glauber theory elastic profile function. The implications of these differences upon the deduced size and structure of th e extended C-19 ground state, from newly reported interaction cross-section measurements, are discussed, including the sensitivity of the cross sectio ns to the assumed 19C single neutron separation energy. [S0556-2813(99)5010 1-5].