Is a neutron halo nothing but a large neutron skin?

In 1967, D. Wilkinson[1] suggested that in neutron rich nuclei, a few neutron might be loosely bound forming ”halos”. Though it was unclear what precisely was meant by this terms, in the ’80 the unusual result concerning the structures in longitudinal momentum distribution [2] in Li fragments from neutron rich Li led physicists[3] to consider the possibility of Li being one of these new “halo” nuclei. This is because, at the time, in high energy (≥ 1Gev/c)heavy ion experiments[4] , it was known that momentum distributions of fragments produced peripherally from ordinary stable nuclei such as O in peripheral interactions were Gaussian whose widths were statistical averages of Fermi motions of the nucleons in the nuclei[5] (200-350 MeV/c) while that of Li was well fitted Former Professor Present mailing address: P.O.Box 14932, Berkeley California, USA 94712