scholarly journals Dynamical study of fission process at low excitation energies in the framework of the four-dimensional Langevin equations

2018 ◽  
Vol 783 ◽  
pp. 163-168
Author(s):  
H. Eslamizadeh ◽  
H. Raanaei
Keyword(s):  
Langevin Equations ◽  
Excitation Energies ◽  
Dynamical Study ◽  
Fission Process

scholarly journals Dynamical study of fission process and estimation of prescission neutron multiplicity

1998 ◽  
Vol 57 (5) ◽  
pp. 2453-2461 ◽  
Author(s):  
Asish K. Dhara ◽  
Kewal Krishan ◽  
Chandana Bhattacharya ◽  
Sailajananda Bhattacharya
Keyword(s):  
Neutron Multiplicity ◽  
Dynamical Study ◽  
Fission Process

INFLUENCE OF NUCLEAR DISSIPATION ON PRESCISSION NEUTRON MULTIPLICITY, FISSION PROBABILITY AND FISSION TIME FOR COMPOUND NUCLEUS 210Po

2012 ◽  
Vol 21 (01) ◽  
pp. 1250008 ◽  
Author(s):  
H. ESLAMIZADEH
Keyword(s):  
Compound Nucleus ◽  
Stochastic Approach ◽  
Neutron Multiplicity ◽  
Langevin Equations ◽  
Excitation Energies ◽  
One Dimensional ◽  
Reduction Coefficient ◽  
Fission Probability ◽  
Nuclear Dissipation ◽  
Good Agreement

A stochastic approach for fission dynamics based on one-dimensional Langevin equations was applied to investigate the effect of the nuclear dissipation on the prescission neutron multiplicity, fission probability and the fission time for the compound nucleus 210 Po in an intermediate range of excitation energies 30–120 MeV. A modified wall and window dissipation with a reduction coefficient, k s , has been used in the Langevin equations. It was shown that the results of the calculations are in good agreement with the experimental data by using values of k s in the range 0.28 ≤ k s ≤ 0.50.

Effect of entrance channel on dynamics of heavy ions collision

2016 ◽  
Vol 25 (01) ◽  
pp. 1650005
Author(s):  
D. Naderi
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Heavy Ions ◽  
Fusion Cross Section ◽  
Evaporation Residue ◽  
Entrance Channel ◽  
Langevin Equations ◽  
Combined Model ◽  
Fission Process ◽  
Cross Section Formula

A combined dynamical model using concept of dinuclear systems (DNS) and one-dimensional (1D) Langevin equations was applied to investigate the effect of entrance channel on dynamics of heavy ions collision. The [Formula: see text]Si+[Formula: see text]Er, [Formula: see text]O+[Formula: see text]W and [Formula: see text]F+[Formula: see text]Ta reactions which formed the compound nucleus [Formula: see text]Pb have been considered to study this effect. We studied these reactions dynamically and calculated the ratio of evaporation residue cross-section to fusion cross-section [Formula: see text] as a tool for investigation of entrance channel effect. Results of combined model are compared with available experimental data and results of 1D Langevin equations. Obtained results based on combined model are in better agreement with experimental data in comparison with results of Langevin equations. We concluded for [Formula: see text]Si+[Formula: see text]Er and [Formula: see text]F+[Formula: see text]Ta reactions the results of combined model that support the quasi-fission process are different relative to Langevin dynamical approach, whereas for [Formula: see text]O+[Formula: see text]W system the two models give similar results.

Study of viscosity on the fission dynamics of the excited nuclei 228U produced in 19F + 209Bi reactions

2015 ◽  
Vol 24 (07) ◽  
pp. 1550052 ◽  
Author(s):  
H. Eslamizadeh
Keyword(s):  
Experimental Data ◽  
Symmetry Axis ◽  
Measured Data ◽  
Total Spin ◽  
Langevin Equations ◽  
Two Dimensional ◽  
Excitation Energies ◽  
Fission Fragments ◽  
Excited Nuclei ◽  
Good Agreement

A two-dimensional (2D) dynamical model based on Langevin equations was applied to study the fission dynamics of the compound nuclei 228 U produced in 19 F + 209 Bi reactions at intermediate excitation energies. The distance between the centers of masses of the future fission fragments was used as the first dimension and the projection of the total spin of the compound nucleus onto the symmetry axis, K, was considered as the second dimension in Langevin dynamical calculations. The magnitude of post-saddle friction strength was inferred by fitting measured data on the average pre-scission neutron multiplicity for 228 U . It was shown that the results of calculations are in good agreement with the experimental data by using values of the post-saddle friction equal to 6–8 × 1021 s -1.

scholarly journals Dynamical Modeling of the Nuclear Fission Process at Low Excitation Energies

2014 ◽  
Vol 02 (05) ◽  
pp. 27-31
Author(s):  
I. I. Gontchar ◽  
M. V. Chushnyakova ◽  
E. P. Oskin ◽  
E. G. Demina
Keyword(s):  
Nuclear Fission ◽  
Excitation Energies ◽  
Dynamical Modeling ◽  
Fission Process

scholarly journals Investigating the fission process at high excitation energies through proton induced reactions on181Ta

2010 ◽  
Vol 8 ◽  
pp. 07011
Author(s):  
Y. Ayyad ◽  
J. Benlliure ◽  
E. Casarejos ◽  
H. Álvarez Pol ◽  
A. Bacquias ◽  
...  
Keyword(s):  
High Excitation ◽  
Excitation Energies ◽  
Fission Process ◽  
Proton Induced Reactions

EXPERIMENTAL STUDY OF p(1 GeV)+natU FISSION–SPALLATION REACTION AND DELAYED NEUTRON MEASUREMENTS

2013 ◽  
Vol 22 (12) ◽  
pp. 1350087 ◽  
Author(s):  
GEDIMINAS STANKUNAS
Keyword(s):  
Experimental Study ◽  
Large Range ◽  
Experimental Studies ◽  
Fission Reactions ◽  
Direct Link ◽  
Spallation Reaction ◽  
Delayed Neutron ◽  
Excitation Energies ◽  
Fission Process ◽  
Fundamental Properties

In this paper, results were obtained in the form of the experimental studies of fission reactions induced by protons in a large range of excitation energies. Some fission product characteristics such as their production yield probabilities and delayed neutron (DV) emission were examined in the dedicated experiment. This paper touches not only fundamental properties of the fission process, but also contains a direct link to various applications.

COLLISIONS OF TRANSACTINIDES: SUPERHEAVY NUCLEI AND GIANT NUCLEAR MOLECULES

2007 ◽  
Vol 16 (04) ◽  
pp. 969-981 ◽  
Author(s):  
VALERY ZAGREBAEV ◽  
WALTER GREINER
Keyword(s):  
Mass Transfer ◽  
Composite System ◽  
Strong Electric Field ◽  
Low Energy ◽  
Langevin Equations ◽  
Superheavy Nuclei ◽  
Heavy Nuclei ◽  
Fission Process ◽  
Nuclear Molecules ◽  
Large Charge

Low energy collisions of very heavy nuclei (238 U +238 U , 232 Th +250 Cf and 238 U +248 Cm ) have been studied within the realistic dynamical model based on multi-dimensional Langevin equations. Large charge and mass transfer was found due to the "inverse quasi-fission" process leading to formation of survived superheavy long-lived neutron-rich nuclei. In many events lifetime of the composite system consisting of two touching nuclei turns out to be rather long; sufficient for spontaneous positron formation from super-strong electric field, a fundamental QED process.

scholarly journals The description of the excitation energy sharing in nuclear fission within the Langevin approach

2021 ◽  
Vol 256 ◽  
pp. 00007
Author(s):  
F.A. Ivanyuk ◽  
S. Chiba
Keyword(s):  
Excitation Energy ◽  
Mass Number ◽  
Nuclear Fission ◽  
Deformation Energy ◽  
Langevin Equations ◽  
Excitation Energies ◽  
Tooth Structure ◽  
Fission Fragments ◽  
Langevin Approach ◽  
Energy Sharing

We apply the four-dimensional Langevin approach to the description of fission of 235U by neutrons and calculate the dependence of the excitation energy of fission fragments on their mass number. For this we run the Langevin equations until the compound nucleus splits into two separated fragments. This is possible since the we used in this work two-center shell model shape parametrization that describes well both compact and separated shapes. The excitation energies of each fragment are calculated assuming that the temperatures of both fragments are the same. The deformation energy of the fragment immediately after scission is added to its excitation energy. The saw-tooth structure of the dependence neutron multiplicity on the fragment’s mass number in reaction 235U + n at En = 5 Mev is qualitatively reproduced.

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