Two-dimensional Langevin modeling of fission dynamics of the excited compound nuclei 188Pt, 227Pa and 251Es

H. Eslamizadeh

doi:10.1088/1674-1137/40/2/024103

Chinese Physics C> 2016, Vol. 40> Issue(2) : 024103 DOI: 10.1088/1674-1137/40/2/024103

Two-dimensional Langevin modeling of fission dynamics of the excited compound nuclei ¹⁸⁸Pt, ²²⁷Pa and ²⁵¹Es

H. Eslamizadeh ^,

1.
Department of Physics, Persian Gulf University 7516913817, Bushehr, Iran

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Abstract：
A stochastic approach based on one- and two-dimensional Langevin equations is applied to calculate the pre-scission neutron multiplicity, fission probability, anisotropy of fission fragment angular distribution, fission cross section and the evaporation cross section for the compound nuclei ¹⁸⁸Pt, ²²⁷Pa and ²⁵¹Es in an intermediate range of excitation energies. The chaos weighted wall and window friction formula are used in the Langevin equations. The elongation parameter, c, is used as the first dimension and projection of the total spin of the compound nucleus onto the symmetry axis, K, considered as the second dimension in Langevin dynamical calculations. A constant dissipation coefficient of K, γ _K = 0.077(MeV zs)^-1/2, is used in two-dimensional calculations to reproduce the above mentioned experimental data. Comparison of the theoretical results of the pre-scission neutron multiplicity, fission probability, fission cross section and the evaporation cross section with the experimental data shows that the results of two-dimensional calculations are in better agreement with the experimental data. Furthermore, it is shown that the two-dimensional Langevin equations together with a dissipation coefficient of K, γ _K = 0.077(MeV zs)^-1/2, can satisfactorily reproduce the anisotropy of fission fragment angular distribution for the heavy compound nucleus ²⁵¹Es. However, a larger value of γ _K = 0.250(MeV zs)^-1/2 is needed to reproduce the anisotropy of fission fragment angular distribution for the lighter compound nucleus ²²⁷Pa.
- Langevin fission dynamics ,
- mean neutron multiplicity ,
- nuclear viscosity

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H. Eslamizadeh. Two-dimensional Langevin modeling of fission dynamics of the excited compound nuclei ¹⁸⁸Pt, ²²⁷Pa and ²⁵¹Es[J]. Chinese Physics C, 2016, 40(2): 024103. doi: 10.1088/1674-1137/40/2/024103

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沈阳化工大学材料科学与工程学院沈阳 110142

Two-dimensional Langevin modeling of fission dynamics of the excited compound nuclei ¹⁸⁸Pt, ²²⁷Pa and ²⁵¹Es

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Two-dimensional Langevin modeling of fission dynamics of the excited compound nuclei ¹⁸⁸Pt, ²²⁷Pa and ²⁵¹Es

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