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The dynamics of fission has been studied by solving one- and three-dimensional Langevin equations with dissipation generated
through the chaos weighted wall and window friction formula. The average prescission neutron multiplicities, fission probabilities
and the mean fission times have been calculated in a broad range of the excitation energy for compound nuclei 210Po and 224Th formed in the fusion-fission reactions 4He + 206Pb , 16O + 208Pb and results compared with the experimental data. The analysis of the results shows that the average prescission neutron
multiplicities, fission probabilities and the mean fission times calculated by one- and three-dimensional Langevin equations
are different from each other, and also the results obtained based on three-dimensional Langevin equations are in better agreement
with the experimental data. 相似文献
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Hadi Eslamizadeh 《中国物理 C》2010,34(11):1714-1716
A dynamical statistical model is used to analyze the experimental shape isomer yields data in the reaction d+240Pu at E=20–29 MeV.The possibility of determining the nuclear dissipation is discussed.Comparison of the experimental data with the calculations leads to a value of the reduced dissipation coeffcient β=0.45×1021 s-1 for the Am isotopes. 相似文献
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A dynamical model based on one-dimensional Langevin equations was used to calculate the average pre-fission multiplicities of neutrons, light charged particles, and the fission probability for compound nucleus178 W produced in fusion reactions. The pre-scission multiplicities of particles and fission probability are calculated and compared with the experimental data over a wide range of excitation energy. A modified wall and window dissipation with a reduction coefficient, ks, has been used in the Langevin equations for reproducing experimental data. It was shown that the results of the calculations are in good agreement with the experimental data by using values of ks in the range 0.24 ks 0.47. 相似文献
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H. Eslamizadeh M. Pirpour 《中国物理C(英文版)》2014,(6):35-39
A dynamical model based on one-dimensional Langevin equations was used to calculate the average pre-fission multiplicities of neutrons, light charged particles, and the fission probability for compound nucleus 17Sw produced in fusion reactions. The pre-seission multiplicities of particles and fission probability are calculated and compared with the experimental data over a wide range of excitation energy. A modified wall and window dissipation with a reduction coefficient, ks, has been used in the Langevin equations for reproducing experimental data. It was shown that the results of the calculations are in good agreement with the experimental data by using values of ks in the range 0.24〈 ks 〈0.47. 相似文献
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D. O. Eremenko A. V. Dermenev V. A. Drozdov S. Yu. Platonov O. V. Fotina M. H. Eslamizadeh O. A. Yuminov 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(3):393-400
Formation of angular distributions of fission fragments for the 16O + 232Th and 12C + 235,236U reactions has been analyzed within a dynamic approach. In this approach, the component of the total angular momentum along the fission axis K is considered as a fluctuating quantity and the corresponding relaxation time is assumed to be the main parameter controlling the evolution of this mode. Particular attention is paid to the analysis of the effect of initial distributions over K (formed during fusion) on the angular distribution of fission fragments of nuclei having fission barriers comparable with the nuclear temperatures. 相似文献
6.
D. O. Eremenko V. A. Drozdov S. Yu. Platonov O. V. Fotina M. H. Eslamizadeh O. A. Yuminov 《Moscow University Physics Bulletin》2008,63(2):118-122
A dynamical-statistical model is used to analyze the experimental angular distributions of fission fragments in the reactions α + 238U, 237Np at E α = 20–100 MeV, as well as to determine the Am isotope fission probabilities and the shape isomer yields in the reactions d + 242,240Pu at E d = 20–30 MeV. Manifestations of shell effects are found in the fission barrier structure up to the excitation energies of 50–60 MeV. 相似文献
7.
Hadi Eslamizadeh 《中国物理C(英文版)》2010,34(11)
A dynamical statistical model is used to analyze the experimental shape isomer yields data in the reaction d+240pu at E=20-29 MeV.The possibility of determining the nuclear dissipation is discussed.Comparison of the experimental data with the calculations leads to a value of the reduced dissipation coefficient β=0.45×1021 S-1 for the Am isotopes. 相似文献
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