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

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).

DYNAMICAL STUDY OF PHONONS IN FERROELECTRIC LEAD TITANATE

1981 ◽  
Vol 42 (C6) ◽  
pp. C6-433-C6-435
Author(s):  
R. S. Katiyar ◽  
J. D. Freire
Keyword(s):  
Lead Titanate ◽  
Dynamical Study

scholarly journals A Dynamical Study of Fusion Hindrance with Nakajima-Zwanzig Projection Method

2021 ◽  
Author(s):  
Yasuhisa Abe ◽  
David Boilley ◽  
Quentin Hourdillé ◽  
Caiwan Shen
Keyword(s):  
Cross Sections ◽  
Degrees Of Freedom ◽  
Operator Method ◽  
Initial Distribution ◽  
Physical Parameters ◽  
Relaxation Processes ◽  
Fast Variable ◽  
Dynamical Study ◽  
Injection Point ◽  
Slow Variables

Abstract A new framework is proposed for the study of collisions between very heavy ions which lead to the synthesis of Super-Heavy Elements (SHE), to address the fusion hindrance phenomenon. The dynamics of the reaction is studied in terms of collective degrees of freedom undergoing relaxation processes with different time scales. The Nakajima-Zwanzig projection operator method is employed to eliminate fast variable and derive a dynamical equation for the reduced system with only slow variables. There, the time evolution operator is renormalised and an inhomogeneous term appears, which represents a propagation of the given initial distribution. The term results in a slip to the initial values of the slow variables. We expect that gives a dynamical origin of the so-called “injection point s” introduced by Swiatecki et al in order to reproduce absolute values of measured cross sections for SHE. A formula for the slip is given in terms of physical parameters of the system, which confirms the results recently obtained with a Langevin equation, and permits us to compare various incident channels.

scholarly journals Dynamical study of infochemical influences on tropic interaction of diffusive plankton system

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Satish Kumar Tiwari ◽  
Ravikant Singh ◽  
Nilesh Kumar Thakur
Keyword(s):  
Dimethyl Sulfide ◽  
Algal Bloom ◽  
Turing Instability ◽  
Model System ◽  
Ode Model ◽  
Estuarine Ecosystem ◽  
Dynamical Study ◽  
Oscillatory Dynamics ◽  
The Stability ◽  
Microzooplankton Grazing

AbstractWe propose a model for tropic interaction among the infochemical-producing phytoplankton and non-info chemical-producing phytoplankton and microzooplankton. Volatile information-conveying chemicals (infochemicals) released by phytoplankton play an important role in the food webs of marine ecosystems. Microzooplankton is an ecologically important grazer of phytoplankton for coexistence of a large number of phytoplankton species. Here, we discuss how information transferred by dimethyl sulfide shapes the interaction of phytoplankton. Phytoplankton deterrents may lead to propagation of IPP bloom. The interaction between IPP and microzooplankton follows the Beddington–DeAngelis-type functional response. Analytically, we discuss boundedness, stability and Turing instability of the model system. We perform numerical simulation for temporal (ODE model) as well as a spatial model system. Our numerical investigation shows that microzooplankton grazing refuse of IPP leads to oscillatory dynamics. Increasing diffusion coefficient of microzooplankton shows Turing instability. Time evolution also plays an important role in the stability of system dynamics. The results obtained in this paper are useful to understand the dominance of algal bloom in coastal and estuarine ecosystem.

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