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A dynamical Langevin model is employed to evaluate the excess of the neutron emission in the fission ofheavy nuclei ~(240)Cf,~(246)Cf,~(254)Cf,~(240)U relative to the standard statistical-model prediction at various saddle-to-scissionfriction strengths.It is shown that when the neutron-to-proton ratio N/Z of the system increases,the sensitivityof the excess to the friction decreases substantially,and it almost disappears for ~(240)U.We suggest that using thosecompound systems with low N/Z favors an accurate determination for the saddle-to-scission friction strength based onthe measurement of the pre-scission neutron multiplicity.
A dynamical Langevin model is employed to evaluate the excess of the neutron emission in the fission of the heavy nuclei ~ 240 Cf ~ 246 Cf ~ 254 Cf ~ 240 U relative to the standard statistical-model prediction at various saddle-to-scissionfriction strengths. It is shown that when the neutron-to-proton ratio N / Z of the system increases, the sensitivity of the excess to the friction increases, and it almost disappears for ~ (240) U. We suggest that using those systems with low N / Z favors an accurate determination for the saddle-to-scission friction strength based on the measurement of the pre-scission neutron multiplicity.