Study of fusion and fission cross sections and pre-fission particles multiplicities for excited nuclei 227 Pa

Eslamizadeh, H.; Soltani, M. R.

doi:10.1016/j.anucene.2015.01.035

Cited by 13 publications

(4 citation statements)

References 35 publications

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“…Experimental uncertainties are smaller than the symbols. distributions of fission fragments, evaporation residue cross section, fission probability and the pre-scission neutron multiplicity for the excited compound nuclei Yb, which was proposed in [62,63]. The authors in [16,62,63] extracted suitable values of the parameter l and r s in simultaneous reproduction of the experimental data on the fission and residue cross sections in a wide range of excitation energy.…”

Section: Resultsmentioning

confidence: 99%

Theoretical study of different features of the fission process of excited nuclei in the framework of the modified statistical model and four-dimensional dynamical model

Eslamizadeh

2017

J. Phys. G: Nucl. Part. Phys.

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Evaporation residue cross section, fission probability, anisotropy of fission fragment angular distribution, mass and energy distributions of fission fragments and the pre-scission neutron multiplicity for the excited compound nuclei and produced in fusion reactions have been calculated in the framework of the modified statistical model and multidimensional dynamical model. In the dynamical calculations, the dynamics of fission of excited nuclei has been studied by solving three- and four-dimensional Langevin equations with dissipation generated through the chaos-weighted wall and window friction formula. Three collective shape coordinates plus the projection of total spin of the compound nucleus to the symmetry axis, were considered in the four-dimensional dynamical model. A non-constant dissipation coefficient of was applied in the four-dimensional dynamical calculations. A comparison of the results of the three- and four-dimensional dynamical models with the experimental data showed that the results of the four-dimensional dynamical model for the evaporation residue cross section, fission probability, anisotropy of fission fragment angular distribution, mass and energy distributions of fission fragments and the pre-scission neutron multiplicity are in better agreement with the experimental data. It was also shown that the modified statistical model can reproduce the above-mentioned experimental data by choosing appropriate values of the temperature coefficient of the effective potential, and the scaling factor of the fission-barrier height, .

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Section: Resultsmentioning

confidence: 99%

Theoretical study of different features of the fission process of excited nuclei in the framework of the modified statistical model and four-dimensional dynamical model

Eslamizadeh

2017

J. Phys. G: Nucl. Part. Phys.

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“…This discrepancy can be explained in terms of Eq. (11). This equation was obtained assuming a dinucleus (a system consisting of two nuclei connected by a neck) and is only valid for systems with a well-defined neck.…”

Section: Resultsmentioning

confidence: 99%

“…( 11) and for mononuclear shapes without a neck, we can extrapolate the results of Eq. (11). Figure 4 shows the results of the calculations for the dissipation coefficient of K as a function of elongation parameter c for the compound nucleus 206 Po.…”

Section: Description Of the Modelmentioning

confidence: 99%

Simulation of the fission dynamics of the excited compound nuclei ²⁰⁶ Po and ¹⁶⁸ Yb produced in the reactions ¹² C+ ¹⁹⁴ Pt and ¹⁸ O+ ¹⁵⁰ Sm

Eslamizadeh¹,

Bagheri²

2017

Chinese Phys. C

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A two-dimensional dynamical model based on the Langevin equation was used to study the fission dynamics of the compound nuclei 206 Po and 168 Yb produced in the reactions 12 C+ 194 Pt and 18 O+ 150 Sm, respectively. The fission cross section and average pre-scission neutron multiplicity were calculated for the compound nuclei 206 Po and 168 Yb, and results of the calculations compared with the experimental data. The elongation coordinate was used as the first dimension and the projection of the total spin of the compound nucleus onto the symmetry axis, K, considered as the second dimension in the Langevin dynamical calculations. In the two-dimensional calculations, a constant dissipation coefficient of K and a non-constant dissipation coefficient have been used to reproduce the abovementioned experimental data. It is shown that the two-dimensional Langevin equation can satisfactorily reproduce the fission cross section and average pre-scission neutron multiplicity for the compound nuclei 206 Po and 168 Yb by using constant values of the dissipation coefficient of K equal to γK = 0.18(MeV zs) −1/2 and γK = 0.20(MeV zs) −1/2 for the compound nuclei 206 Po and 168 Yb, respectively.

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“…During recent decades different dynamical and statistical models have been extensively and rather successfully used to elucidate many problems of fusion-fission reactions (see, for example Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]). Many researchers in their computational representations of different features of fusion-fission reactions have assumed that compound nuclei have zero spin about the symmetry axis.…”

Section: Introductionmentioning

confidence: 99%

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

Eslamizadeh¹

2016

Chinese Phys. C

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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 188 Pt, 227 Pa and 251 Es 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, γK = 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, γK = 0.077(MeV zs) −1/2 , can satisfactorily reproduce the anisotropy of fission fragment angular distribution for the heavy compound nucleus 251 Es. However, a larger value of γK = 0.250(MeV zs) −1/2 is needed to reproduce the anisotropy of fission fragment angular distribution for the lighter compound nucleus 227 Pa.

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Study of fusion and fission cross sections and pre-fission particles multiplicities for excited nuclei 227 Pa

Cited by 13 publications

References 35 publications

Theoretical study of different features of the fission process of excited nuclei in the framework of the modified statistical model and four-dimensional dynamical model

Theoretical study of different features of the fission process of excited nuclei in the framework of the modified statistical model and four-dimensional dynamical model

Simulation of the fission dynamics of the excited compound nuclei ²⁰⁶ Po and ¹⁶⁸ Yb produced in the reactions ¹² C+ ¹⁹⁴ Pt and ¹⁸ O+ ¹⁵⁰ Sm

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

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Study of fusion and fission cross sections and pre-fission particles multiplicities for excited nuclei 227 Pa

Cited by 13 publications

References 35 publications

Theoretical study of different features of the fission process of excited nuclei in the framework of the modified statistical model and four-dimensional dynamical model

Theoretical study of different features of the fission process of excited nuclei in the framework of the modified statistical model and four-dimensional dynamical model

Simulation of the fission dynamics of the excited compound nuclei 206 Po and 168 Yb produced in the reactions 12 C+ 194 Pt and 18 O+ 150 Sm

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

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About

Simulation of the fission dynamics of the excited compound nuclei ²⁰⁶ Po and ¹⁶⁸ Yb produced in the reactions ¹² C+ ¹⁹⁴ Pt and ¹⁸ O+ ¹⁵⁰ Sm

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