Evaporation residue cross sections for the "0+"Ni and ' 0+ Ni fusion reactions have been measured in the energy range from 3 below to 20 MeV above the Coulomb barrier. The low-energy fusion enhancements found in the two systems are very different. A comparative analysis suggests that collective pair transfer modes play an important role in the sub-barrier fusion of ' 0+' Ni.PACS number(s): 25.70.Jj
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