FUSION-FISSION AND QUASI-FISSION PROCESSES IN REACTIONS USING ACTINIDE TARGET NUCLEI

2010 ◽  
Vol 19 (05n06) ◽  
pp. 813-824
Author(s):  
YOSHIHIRO ARITOMO
Keyword(s):  
Experimental Data ◽  
Nuclear Structure ◽  
Energy Dependence ◽  
Mass Distribution ◽  
Cross Sections ◽  
Langevin Equation ◽  
Incident Energy ◽  
Dynamical Model ◽  
Fission Fragments ◽  
Fine Structures

We analyzed experimental data obtained for the mass distribution of fission fragments in the reactions 36 S +238 U and 30 Si +238 U at several incident energies, which were performed by the JAEA group. Using the dynamical model with the Langevin equation, we precisely investigate the incident energy dependence of the mass distribution of fission fragments. We also consider the fine structures in the mass distribution of fission fragments caused by the nuclear structure at a low incident energy. It is explained why the mass distribution of fission fragments has different features in the two reactions. The fusion cross sections are also estimated.

scholarly journals Energy Dependence of Total Cross Sections for Reactions with 4, 6he, 6, 7, 9li Nuclei

KnE Energy ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 21
Author(s):  
Yu Penionzhkevich ◽  
Yu Sobolev ◽  
V Samarin ◽  
M Naumenko
Keyword(s):  
Experimental Data ◽  
Energy Range ◽  
Numerical Solution ◽  
Energy Dependence ◽  
Cross Sections ◽  
Beam Energy ◽  
Microscopic Analysis ◽  
Time Dependent ◽  
Total Cross Sections ◽  
Good Agreement

The paper presents the results of measurement of the total cross sections for reactions 4,6He + Si and 6,7,9Li + Si in the beam energy range 5−50 A⋅MeV. The enhancements of the total cross sections for reaction 6He + Si compared with reaction 4He + Si, and 9Li + Si compared with reactions 6,7Li + Si have been observed. The performed microscopic analysis of total cross sections for reactions 6He + Si and 9Li + Si based on numerical solution of the time-dependent Schrödinger equation for external neutrons of projectile nuclei 6He and 9Li yielded good agreement with experimental data.

scholarly journals Comparative Analysis of 13,14C Induced Reactions on 232Th Target

2021 ◽  
Vol 9 (1) ◽  
pp. 47-53
Author(s):  
Manpreet Kaur ◽  
BirBikram Singh ◽  
Manoj K. Sharma
Keyword(s):  
Experimental Data ◽  
Comparative Analysis ◽  
Comparative Study ◽  
Mass Distribution ◽  
Cross Section ◽  
Cross Sections ◽  
Coulomb Barrier ◽  
Spherical Shape

We have investigated the pairing and magicity effect in context of a comparative study of 13,14C induced reactions on 232Th target at energies in the vicinity of Coulomb barrier. The fission distribution and related properties are explored in terms of the summed-up preformation probabilities. The barrierpenetrability is found to be higher for fragments emitted from 246Cm* formed in 14C+232Th reaction than those emitted in the fission of 245Cm*, leading to higher magnitude of cross-section for earlier case. The DCM calculated fusion-fission cross-sections using ΔR=0 fm are normalised to compare with the available experimental data. The calculations are done for spherical shape of fragments and it will be of further interest to explore the fission mass distribution after the inclusion of deformations.

DYNAMICAL CALCULATION FOR FUSION-FISSION PROCESS IN SUPERHEAVY MASS REGION

2004 ◽  
Vol 13 (01) ◽  
pp. 301-304
Author(s):  
Y. ARITOMO ◽  
M. OHTA ◽  
T. MATERNA ◽  
F. HANAPPE ◽  
L. STUTTGÉ
Keyword(s):  
Mass Distribution ◽  
Langevin Equation ◽  
Three Dimensional ◽  
Mass Region ◽  
Neutron Multiplicity ◽  
Fission Process ◽  
Fission Fragments ◽  
Fluctuation Dissipation ◽  
Dynamical Calculation ◽  
Dissipation Model

The fusion-fission process for the synthesis of superheavy elements is discussed on the basis of fluctuation-dissipation model. We employ three-dimensional Langevin equation. We investigate the fusion-fission process by analyzing not only the mass distribution of fission fragments but also neutron multiplicity on fusion-fission process.

scholarly journals Role of correlations in two-neutron transfer reactions

2019 ◽  
Vol 223 ◽  
pp. 01035
Author(s):  
Jesus Lubian ◽  
Jonas L. Ferreira ◽  
Roberto Linares ◽  
Erica N. Cardozo ◽  
Barbara Paes ◽  
...  
Keyword(s):  
Experimental Data ◽  
Angular Distribution ◽  
Cross Sections ◽  
Incident Energy ◽  
Transfer Reactions ◽  
Neutron Transfer ◽  
Pairing Correlation ◽  
High Degree ◽  
Theoretical Results

This work presents theoretical results compared with the experimental data for the two–neutron transfer angular distribution in which a beam of 18O nucleus, at 84 MeV incident energy, has collided onthe 13C, 28Si, and 64Ni targets. The two-neutron transfer in the 9Be(7Be,9Be)7Be reaction, at 23.1 MeV incident energy, was also analyzed. The main goal was to verify the relevance of the pairing correlation of the two transferred neutrons on the cross sections and to show its role when both neutrons are transferred to states with a low and high degree of collectivity.

COHERENT PRODUCTION OF PARTICLES IN INTERACTIONS OF 800 GEV PROTONS WITH EMULSION NUCLEI

1988 ◽  
Vol 03 (05) ◽  
pp. 489-495 ◽  
Author(s):  
A. Abduzhamilov ◽  
Sh. Abduzhamilov ◽  
L. Barbier ◽  
L. Chernova ◽  
M. M. Chernyavski ◽  
...  
Keyword(s):  
Experimental Data ◽  
Energy Dependence ◽  
Cross Sections ◽  
Diffractive Dissociation ◽  
Basic Characteristics

The experimental data on total and topological cross sections for coherent diffractive dissociation of 800 GeV protons on emulsion nuclei are presented. The energy dependence of basic characteristics of these reactions is discussed.

NEUTRON EVAPORATION IN THE 14-MEV NEUTRON FISSION OF URANIUM

1961 ◽  
Vol 39 (7) ◽  
pp. 967-975 ◽  
Author(s):  
G. C. Hanna ◽  
R. L. Clarke
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Neutron Emission ◽  
Neutron Energy Spectrum ◽  
Measured Intensity ◽  
Neutron Fission ◽  
Fission Fragments ◽  
Neutron Evaporation ◽  
Neutron Multiplicities ◽  
Calculated Number

The numbers of prefission and postfission neutrons expected from the 14-Mev neutron fission of uranium have been calculated from the experimental data on partial cross sections and neutron multiplicities. It has been assumed that the competition between neutron emission and fission does not change with increasing energy beyond threshold. The neutron energy spectrum measured recently by Clarke gives a smaller intensity in the energy range 4–6 Mev than is expected from the calculated number of postfission neutrons. The measured intensity suggests that only 2.1 ± 0.5 neutrons are evaporated from the moving fission fragments.

Photoproduction of positive pions from 16O at medium energies

1980 ◽  
Vol 58 (8) ◽  
pp. 1151-1162 ◽  
Author(s):  
V. Devanathan ◽  
V. Girija ◽  
G. N. Sivarama Prasad
Keyword(s):  
Experimental Data ◽  
Nuclear Structure ◽  
Cross Sections ◽  
Impulse Approximation ◽  
Wave Functions ◽  
Fair Agreement ◽  
Free Nucleon ◽  
Distorted Wave ◽  
Distorted Wave Impulse Approximation ◽  
Γ Ray

The reaction 16O(γ,π+)16N has been studied in the distorted wave impulse approximation (DWIA) using the free-nucleon photopion amplitude. The nuclear distortion effects on the emitted pion and also the effect of nuclear structure are investigated in detail. The effect of nuclear distortion is found to be small at lower energies but is of great importance resulting in large absorption of pions around the (3,3) resonance. Using realistic nuclear wave functions, it is found that the DWIA yields cross sections in fair agreement with the experimental data at γ-ray energies above 230 MeV but higher values at lower energies.

Influence of neutrons on charge-changing cross-sections

2019 ◽  
Vol 28 (08) ◽  
pp. 1950070
Author(s):  
G. W. Fan ◽  
Xu Zhan
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Incident Energy ◽  
Neutron Number ◽  
Glauber Model ◽  
C Isotopes ◽  
Theoretical Results

The influence of neutrons on charge changing cross-sections ([Formula: see text]) in C isotopes on [Formula: see text]C and proton targets has been investigated in the framework of Glauber model. By comparing the theoretical results and experimental data, it is found out that the influence mainly comes from the projectile neutrons, and the [Formula: see text] has a slight change with the increase of the neutron number. Besides, the calculations also illustrate that the influence gets bigger with the reduction of the incident energy.

DYNAMICAL STUDY OF ANISOTROPY IN ANGULAR DISTRIBUTION OF FISSION FRAGMENTS IN 16O+181Ta AND 16O+208Pb FUSION–FISSION REACTIONS

2011 ◽  
Vol 20 (01) ◽  
pp. 45-53 ◽  
Author(s):  
M. R. PAHLAVANI ◽  
D. NADERI ◽  
S. M. MIRFATHI
Keyword(s):  
Experimental Data ◽  
Angular Distribution ◽  
Langevin Equation ◽  
Three Dimensional ◽  
Neutron Multiplicity ◽  
Fission Reactions ◽  
Dynamical Study ◽  
Fission Fragments ◽  
Fragment Angular Distribution ◽  
Theoretical Results

The three-dimensional Langevin equation (LE) and Transition State Model (TSM) are applied to calculate prescission neutron multiplicity and anisotropy of fission fragment angular distribution for 16O+181Ta and 16O+208Pb systems. Dynamical calculations were carried out considering one-body dissipation. Theoretical results of pre-scission neutron multiplicity and anisotropy have been compared with experimental data for given systems. Calculations show that the results of anisotropy based on dynamical approach are in better agreement with the experimental data as compared with the TSM (in saddle point).

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