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Enhanced fusion-evaporation cross sections in neutron-rich 132Sn on 64Ni
J F Liang1, D Shapira, C J Gross
1Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Abstract:
Evaporation residue cross sections have been measured with neutron-rich radioactive 132Sn beams on 64Ni in the vicinity of the Coulomb barrier. The average beam intensity was 2 x 10(4) particles per second and the smallest cross section measured was less than 5 mb. Large sub-barrier fusion enhancement was observed. Coupled-channel calculations taking into account inelastic excitation significantly underpredict the measured cross sections below the barrier. The presence of several neutron transfer channels with large positive Q values suggests that multinucleon transfer may play an important role in enhancing the fusion of 132Sn and 64Ni.
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