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Using a Langevin equation coupled with a statistical model,we calculate pre-scission giant dipole resonance(GDR) γ-ray multiplicity of nuclei ~(194)pb,~(200)Pb,~(206)Pb,and ~(200)Os.It is demonstrated that with increasing the isospinasymmetry of these fissioning nuclei the sensitivity of the emitted γ multiplicity to the nuclear viscosity coefficient isdecreased significantly.For ~(200)Os nucleus,this γ-ray emission is no longer sensitive to the magnitude of the viscositycoefficient.In addition,the effect of the isospin asymmetry on the γ rays as a probe of nuclear dissipation is reducedwith increasing angular momentum.These results suggest that to obtain a more accurate information of the viscositycoefficient by the measurement of pre-scission GDR γ-ray multiplicity it is better to choose those compound systemswith small isospin asymmetry and low spin.
Using a Langevin equation coupled with a statistical model, we calculated pre-scission giant dipole resonance (GDR) γ-ray multiplicity of nuclei ~ (194) pb, ~ 200 Pb, ~ 206 Pb and ~ Os. It is demonstrated that with increasing the isospinasymmetry of these fissioning nuclei the sensitivity of the emitted γ multiplicity to nuclear nuclear coefficient is greatly increased. For ~ (200) Os nucleus, this γ-ray emission is no longer sensitive to the magnitude of the viscositycoefficient.In addition, the effect of the isospin asymmetry on the γ rays as a probe of nuclear dissipation is reduced with increasing angular momentum. the results suggest that to obtain a more accurate information of the viscositycoefficient by the measurement of pre-scission GDR γ -ray multiplicity it is better to choose those compound systems with small isospin asymmetry and low spin.