EXPLORATORY COUPLED-CHANNELS CALCULATIONS FOR LOOSELY BOUND CARBON ISOTOPES

We have investigated the loosely bound halo candidates C-17 and C-19 i n a neutron+core coupling model. A deformed Woods-Saxon potential is u sed for the neutron-core interaction and the coupled channels equation s are solved with Sturmian expansions of the relative motion wave func tions for experimental one-neutron separation energies, The r.m.s. mat ter radii, longitudinal momentum distributions, E1 strength functions, neutron stripping cross sections and electromagnetic dissociation cro ss sections are calculated, Their sensitivity to the structural assump tions is explored. Available data does not allow final conclusions to be drawn for C-19 but an assessment of the possible character of C-17 and C-19 is made, and in particular, of the role of s-orbital motion b etween halo-neutron and core, (C) 1998 Elsevier Science B.V.