Using multidimensional Langevin equations, we have calculated the angular distribution of fission fragments with nonconstant values for the dissipation coefficient of the K coordinate (the projection of the total angular momentum I onto the symmetry axis of the fissioning nuclear system) for symmetry and asymmetry fission. We investigated the relaxation time of the K coordinate, τ K , as a function of scission criteria and the asymmetry parameter. Calculations are done for 16 O + 232 Th −→ 248 Cf, 16 O + 238 U −→ 254 Fm, and 16 O + 248 Cm −→ 264 Rf reactions and obtained results are compared with available experimental data. Our calculations with nonconstant values of the K coordinate show that the agreement between theoretical calculations and experimental data for asymmetry fission is better than that for symmetry fission.
Four-dimensional Langevin equations have been applied to calculate the neutron multiplicity and evaporation residue cross section for hot nuclei. The projection of the total spin of the compound nucleus to the symmetry axis, K, is the fourth dimension in Langevin dynamical calculations. The relaxation time of the K as a function of the dynamical parameters is investigated. Calculations were performed for the 18 O+ 192 Os and 19 F+ 169 Tm reactions with a non-constant dissipation coefficient for the K coordinate. The obtained results based on four-dimensional Langevin equations with a non-constant dissipation coefficient in comparison with calculations based on a constant dissipation coefficient (γ K = 0.077(MeVzs) −1/2 ) are in better agreement with the experimental data. The difference between the two models for the evaporation residue cross section is high, whereas for neutron multiplicity, the discrepancy is low.
In this paper, Coulomb and proximity potential model has been applied to calculate the half-lives of alpha-decay for isotopes around N = Z = 50. Using this model, we investigated the influence of deformation and orientation of daughter nucleus on alpha-decay half-lives. Two orientations (90 • and 180 • ) with quadrupole deformation are applied to study the role of daughter orientation in alpha-decay process. It is found that the deformation and orientation of daughter nucleus affects the alpha-decay half-life and changes the slope and intercept of linear relation between log 10 (T 1/2 ) and Q −1/2 .
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