Roles of Isospin in Evaporation Residue Cross Section as a Probe of Nuclear Dissipation

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The influence of isospin on the excess of evaporation residue cross section over its standard statistical-model value for nuclei 194Pb, 200Pb, and 206Pb is studied via a Langevin equation coupled with a statistical decay model. The magnitude of this excess for a low-isospin fissioning nucleus is shown to be larger and its dependence on the nuclear viscosity coefficient to be stronger than those of a high-isospin fissioning nucleus. These results suggest that to obtain a more accurate information of viscosity coefficient inside the saddle point by measuring evaporation residue cross sections, we had better choose those compound systems with small isospin.