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     In the present paper, we simulate fission process of the excited nuclei ²¹⁷Fr produced in fusion reactions ¹⁹F with ¹⁹⁸Pt nuclei in the framework of the Langevin equations. We calculate the pre-scission neutron multiplicity for the excited nuclei ²¹⁷Fr with considering the effects of temperature and projection of spin about the symmetry axis, K. We show that temperature and projection of spin about the symmetry axis affect on the results of pre-scission neutron multiplicity and without considering the effects of temperature and projection of spin; the results of calculations are less than the experimental data. Furthermore, based on fission process simulation and considering the reduced dissipation coefficient as a free parameter we reproduce experimental data on the pre-scission neutron multiplicity for the excited nuclei ²¹⁷Fr. We also show that the appropriate value of reduced dissipation coefficient for ²¹⁷Fr is equal to.

Keywords: Fission, pre-scission neutron multiplicity, reduced dissipation coefficient

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