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Reaction products from the interaction of ⁶He with ²⁰⁹Bi have been measured at energies near the Coulomb barrier. A ⁴He group of remarkable intensity, which dominates the total reaction cross section, has been observed. The angular distribution of the group suggests that it results primarily from a direct nuclear process. It is likely that this transfer and/or breakup channel is the doorway state that accounts for the previously observed large sub-barrier fusion enhancement in this system.