Neutron Transfer Dynamics and Doorway to Fusion in Time-Dependent   Hartree-Fock Theory
  We analyze the details of mass exchange in the vicinity of the Coulomb barrier for heavy-ion collisions involving neutron-rich nuclei using the time-dependent Hartree-Fock (TDHF) theory. We discuss the time-dependence of transfer and show that the potential barriers seen by individual single-particle states can be considerably different than the effective barrier for the two interacting nuclei having a single center-of-mass. For this reason we observe a substantial transfer probability even at energies below the effective barrier. 
A.S. Umar, V.E. Oberacker, and J.A. Maruhn