  Evaporation residue cross sections have been measured with neutron-rich
radioactive $^{132}$Sn beams on $^{64}$Ni in the vicinity of the Coulomb
barrier. The average beam intensity was $2\times 10^{4}$ particles per second
and the smallest cross section measured was less than 5 mb. Large subbarrier
fusion enhancement was observed. Coupled-channels calculations taking into
account inelastic excitation and neutron transfer underpredict the measured
cross sections below the barrier.

Nuclear Experiment