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The spin distribution of the evaporation residue cross section of nuclei ~(194)pb,~(200)Pb,~(206)pb,and ~(100)Os arecalculated via a Langevin equation coupled with a statistical decay model.It is shown that with increasing the neutron-to-proton ratio (N/Z) of the system,the sensitivity of the spin distribution to the nuclear dissipation is decreasedsignificantly.Moreover,for ~(200)Os this spin distribution is no longer sensitive to the nuclear dissipation.These resultssuggest that to obtain a more accurate pre-saddle viscosity coefficient through the measurement of the evaporationresidue spin distribution,it is best to yield those compound systems with low N/Z.
The spin distribution of the evaporation residue cross section of nuclei ~ (194) pb, ~ (200) Pb, ~ (206) pb, and ~ (100) Os arecalculated via a Langevin equation coupled with a statistical decay model that with increasing the neutron-to-proton ratio (N / Z) of the system, the sensitivity of the spin distribution to the nuclear dissipation is decreased least surely. Moreover, for ~ (200) Os this spin distribution is no longer sensitive to the nuclear dissipation. this resultssuggest that to obtain a more accurate pre-saddle viscosity coefficient through the measurement of the evaporationresidue spin distribution, it is best to yield those compound systems with low N / Z.