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.

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).

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.

FUSION-FISSION DYNAMICS IN SUPERHEAVY MASS REGION

2009 ◽  
Vol 18 (10) ◽  
pp. 2145-2149
Author(s):  
YOSHIHIRO ARITOMO
Keyword(s):  
Cross Section ◽  
Three Dimensional ◽  
Fusion Cross Section ◽  
Fission Cross Section ◽  
Mass Region ◽  
Coordinate Space ◽  
Trajectory Calculation ◽  
Dynamical Calculation ◽  
Symmetric Fission ◽  
Three Dimensional Coordinate

In heavy nucleus collision experiments, the fusion-fission cross section is derived from counting mass-symmetric fission events. However, a discrepancy exists between the experimental and theoretical estimations of the fusion cross section. We attempt to clarify the origin of the discrepancy and remove it by performing a dynamical calculation. The trajectory calculation has been performed in three-dimensional coordinate space with the Langevin equation.

THREE DIMENSIONAL INTERPRETATION OF GRAVITATIONAL ANOMALIES

Geophysics ◽  
1952 ◽  
Vol 17 (2) ◽  
pp. 344-364 ◽  
Author(s):  
Fraser S. Grant
Keyword(s):  
Gravitational Field ◽  
Mass Distribution ◽  
Three Dimensional ◽  
Relaxation Method ◽  
The Body ◽  
Multipole Moments ◽  
Size And Shape ◽  
Surface Field ◽  
Derivatives Of

A method is developed for determining the approximate size and shape of the three‐dimensional mass distribution that is required to produce a given gravitational field. The first few reduced multipole moments of the distribution are calculated from the derivatives of the surface field, and the approximative structure is determined from the values of these moments and a knowledge of the density contrast between the body and its surroundings. A system of classification of problems by symmetry is introduced and its practical usage discussed. A relaxation method is described which may be used to adjust the initial solution systematically to give agreement over the whole field. A descriptive discussion is appended.

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

Dynamics of fusion-fission process with neutron evaporation in superheavy mass region

2004 ◽  
Vol 734 ◽  
pp. 180-183 ◽  
Author(s):  
Y. Aritomo ◽  
M. Ohta ◽  
T. Materna ◽  
F. Hanappe ◽  
L. Stuttge
Keyword(s):  
Mass Region ◽  
Fission Process ◽  
Neutron Evaporation
Sign in / Sign up

Export Citation Format

Share Document