  We describe a schematic coupled channels transfer calculation for the
reaction 6He + 238U at near-barrier energies. We also present a simple
semiclassical DWBA calculation of the two neutron transfer. Both calculations
are meant to supply the conditions under which the transfer cross section
becomes much larger than the complete fusion one at sub-barrier energies. It
seems that a feasible mechanism is the incoherent contributions of two or more
processes with quite different Q-vlaues.
