Influence of angular momentum on evaporation residue cross section as a probe of nuclear dissipation**Supported by National Natural Science Foundation of China (10405007)

Abstract

By calculating the excess of the evaporation residue cross sections of the 200Pb nucleus over that predicted by the standard statistical model as a function of nuclear viscosity coefficient using a Langevin equation combined with a statistical decay model, it is found that high angular momentum not only amplifies the dissipation effects on the excess of the evaporation residue cross sections, but also considerably increases the sensitivity of this excess to the nuclear viscosity coefficient. These results suggest that on the experimental side, to accurately obtain the information of nuclear dissipation inside the saddle point by measuring the evaporation residue cross section, it had better populate those compound systems with high spins.