Influence of angular momentum on evaporation residue cross section as a probe of nuclear dissipation

• 作 者: 叶巍 吴锋
• 机 构: Department of Physics Southeast University,Department of Physics,Southeast University,,Nanjing 21009
• 出 处: 中国物理C
• 发表日期: 2008年06期
• 关键词: evaporation dissipation residue momentum angular viscosity Langevin nucleus sadd

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.

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 taller 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.