scholarly journals T-dependent RMF Model Applied to Ternary Fission Studies

2021 ◽  
Vol 9 (1) ◽  
pp. 95-101
Author(s):  
C. Kokila ◽  
C. Karthika ◽  
M. Balasubramaniam
Keyword(s):  
Level Density ◽  
Maximum Yield ◽  
Mean Field ◽  
Ternary Fission ◽  
Nuclear Level Density ◽  
Temperature Dependent ◽  
Yield Distribution ◽  
Relativistic Mean Field ◽  
Specific Temperature ◽  
Initial Results

Ternary decay is comparatively a rare phenomenon. The yield distribution for the thermal neutroninduced fission of 236U was investigated within the Temperature-dependent Relativistic Mean Field (TRMF) approach and statistical theory. Binding energy obtained from TRMF for the ground state and at a specific temperature is used to evaluate the fragment excitation energy, which is needed to calculate the nuclear level density. Using the ternary convolution, the yield for α-accompanied fission of 236U* is calculated. Initial results are presented which shows a maximum yield for the fragment pair Tc + Ag +α. Further, the ternary pre-existence probability for the spontaneous fission of 236U was studied considering fixed third fragments of α,10Be and 14C using the area of the overlapping region. No significant change in the yield distribution was observed when fragment deformations are considered. However, the heavy group for the probable pair remains as 132Sn with a change in mass number of the lighter fragment. 

NUCLEAR LEVEL DENSITY PARAMETER WITH YUKAWA FOLDED POTENTIAL

2007 ◽  
Vol 16 (02) ◽  
pp. 566-569 ◽  
Author(s):  
KRZYSZTOF POMORSKI ◽  
BOŻENA NERLO-POMORSKA ◽  
JOHANN BARTEL
Keyword(s):  
Level Density ◽  
Mean Field Theory ◽  
Mean Field ◽  
Field Potential ◽  
Density Parameter ◽  
Nuclear Level Density ◽  
Level Density Parameter ◽  
Hartree Fock ◽  
Relativistic Mean Field ◽  
Particle Level

The average dependence of the single-particle level-density parameter on mass number A, isospin and deformation is determined using the Yukawa folded mean-field potential for spherical and deformed nuclei at temperatures 0 ≤ T ≤ 5 MeV and elongations ranging from oblate shapes to the scission configuration of fissioning nuclei. The results are compared with similar estimates obtained previously using the relativistic mean-field theory, the Skyrme Hartree-Fock and the Thomas-Fermi approach.

NUCLEAR LEVEL DENSITY AT FINITE TEMPERATURES

2006 ◽  
Vol 15 (02) ◽  
pp. 478-483 ◽  
Author(s):  
J. BARTEL ◽  
K. POMORSKI ◽  
B. NERLO-POMORSKA
Keyword(s):  
Single Particle ◽  
Level Density ◽  
Mean Field ◽  
Skyrme Force ◽  
Nuclear Level Density ◽  
Nuclear Level ◽  
Level Densities ◽  
Relativistic Mean Field ◽  
Single Particle Level ◽  
Particle Level

Selfconsistent mean-field calculations have been performed with the SkM* Skyrme force for 140 spherical even-even nuclei at temperatures 0≤T≤4 MeV . Single-particle level densities for this sample of nuclei are determined for various temperatures. The average dependence of the single-particle level density on mass number A and isospin is given and compared with previous estimates obtained using the relativistic mean-field and different semiclassical approaches.

scholarly journals TEMPERATURE DEPENDENCE OF THE NUCLEAR ENERGY IN RELATIVISTIC MEAN-FIELD THEORY

2005 ◽  
Vol 14 (03) ◽  
pp. 505-511 ◽  
Author(s):  
B. NERLO-POMORSKA ◽  
K. POMORSKI ◽  
J. SYKUT ◽  
J. BARTEL
Keyword(s):  
Single Particle ◽  
Level Density ◽  
Mean Field Theory ◽  
Mean Field ◽  
Correction Method ◽  
Shell Correction ◽  
Shell Effects ◽  
Relativistic Mean Field ◽  
Single Particle Level ◽  
Particle Level

Self-consistent relativistic mean-field (RMF) calculations with the NL3 parameter set were performed for 171 spherical even-even nuclei with 16≤A≤224 at temperatures in the range 0≤T≤4 MeV . For this sample of nuclei single-particle level densities are determined by analyzing the data obtained for various temperatures. A new shell-correction method is used to evaluate shell effects at all temperatures. The single-particle level density is expressed as function of mass number A and relative isospin I and compared with previous estimates.

Back shifted Fermi gas model with temperature dependent pairing energy: Thermal properties of 98Mo

2016 ◽  
Vol 25 (09) ◽  
pp. 1650065
Author(s):  
S. A. Alavi ◽  
V. Dehghani
Keyword(s):  
Experimental Data ◽  
Heat Capacity ◽  
Level Density ◽  
Fermi Gas ◽  
Nuclear Level Density ◽  
Temperature Dependent ◽  
Nuclear Level ◽  
Ginzburg Landau ◽  
The Mean ◽  
Good Agreement

The effect of using a temperature dependent pairing term in back-shifted Fermi-gas (BSFG) formula of nuclear level density has been studied. We have used the mean order parameter formula of modified Ginzburg–Landau (MGL) theory as a simple possible choice for temperature dependency of the pairing term. The level density and heat capacity of [Formula: see text]Mo have been calculated with this formalism and compared with the experimental data. We observed good agreement between the heat capacity of this model and the experimental data.

scholarly journals Relative fragmentation in ternary systems within the temperature-dependent relativistic mean-field approach

2017 ◽  
Vol 95 (6) ◽  
Author(s):  
M. T. Senthil Kannan ◽  
Bharat Kumar ◽  
M. Balasubramaniam ◽  
B. K. Agrawal ◽  
S. K. Patra
Keyword(s):  
Mean Field ◽  
Ternary Systems ◽  
Temperature Dependent ◽  
Field Approach ◽  
Relativistic Mean Field

TEMPERATURE DEPENDENCE OF NUCLEAR STRUCTURE IN THE RELATIVISTIC MEAN-FIELD THEORY WITH A NEW PARAMETER SET

2004 ◽  
Vol 13 (06) ◽  
pp. 1147-1155 ◽  
Author(s):  
BOŻENA NERLO-POMORSKA ◽  
KRZYSZTOF POMORSKI ◽  
JOANNA SYKUT ◽  
JOHAN BARTEL
Keyword(s):  
Field Theory ◽  
Single Particle ◽  
Level Density ◽  
Mean Field Theory ◽  
Mean Field ◽  
Relativistic Mean Field Theory ◽  
Level Densities ◽  
Relativistic Mean Field ◽  
Single Particle Level ◽  
Particle Level

A new set of relativistic mean-field theory (RMFT) parameters, NL4, ensuring a better description of the average nuclear energy as given by the new Lublin–Strasbourg mass formula, is used in a self-consistent description of 171 spherical even-even nuclei at temperatures 0≤T≤4 MeV. Single-particle level densities for this sample of nuclei are determined by analyzing the data obtained for various temperatures. The average dependence of the single-particle level density on mass number A and isospin is given and compared with previous estimates obtained using the RMFT-NL3, Thomas–Fermi and semiclassical Skyrme SkM* approaches.

scholarly journals Persistence of magicity in neutron-rich exotic 78Ni in ground as well as excited states

2018 ◽  
Vol 27 (07) ◽  
pp. 1850062 ◽  
Author(s):  
Mamta Aggarwal ◽  
G. Saxena
Keyword(s):  
Excited States ◽  
Ground State ◽  
Theoretical Calculations ◽  
Level Density ◽  
Exotic Nucleus ◽  
Mean Field ◽  
Form Factors ◽  
State Density ◽  
Density Parameter ◽  
Relativistic Mean Field

Recent experimental observation of magicity in [Formula: see text]Ni has infused the interest to examine the persistence of the magic character across the [Formula: see text] shell gap in extremely neutron-rich exotic nucleus [Formula: see text]Ni in ground as well as excited states. A systematic study of Ni isotopes and [Formula: see text] isotones in ground state is performed within the microscopic framework of relativistic mean-field (RMF) theory and the triaxially deformed Nilsson–Strutinsky model (NSM). Ground state density distributions, charge form factors, radii, separation energies, pairing energies, single-particle energies and the shell corrections show strong magicity in [Formula: see text]Ni. Excited nuclei are treated within the statistical theory of hot rotating nuclei where the variations of level density parameter and entropy show significant magicity with a deep minima at [Formula: see text], which persists up to the temperatures [Formula: see text]1.5–2[Formula: see text]MeV and then slowly disappears with increasing temperature. Rotational states are evaluated and effect of rotation on [Formula: see text] ([Formula: see text]) isotones are studied. Our results agree very well with the available experimental data and few other theoretical calculations.

Temperature dependent relativistic mean field for highly excited hot nuclei

2000 ◽  
Vol 62 (5) ◽  
Author(s):  
Y. K. Gambhir ◽  
J. P. Maharana ◽  
G. A. Lalazissis ◽  
C. P. Panos ◽  
P. Ring
Keyword(s):  
Mean Field ◽  
Temperature Dependent ◽  
Relativistic Mean Field ◽  
Hot Nuclei
Sign in / Sign up

Export Citation Format

Share Document