Level-density parameters in the back-shifted Fermi gas model

2000 ◽  
Vol 63 (5) ◽  
pp. 752-757 ◽  
Author(s):  
V. I. Plyaskin ◽  
R. A. Kosilov
Keyword(s):  
Level Density ◽  
Fermi Gas

Test of Fermi gas model predictions of level density inXe137

1985 ◽  
Vol 31 (6) ◽  
pp. 2041-2048 ◽  
Author(s):  
B. Fogelberg ◽  
J. A. Harvey ◽  
M. Mizumoto ◽  
S. Raman
Keyword(s):  
Level Density ◽  
Fermi Gas ◽  
Model Predictions

Level density parameters for the back-shifted fermi gas model in the mass range 40 < A < 250

1973 ◽  
Vol 217 (2) ◽  
pp. 269-298 ◽  
Author(s):  
W. Dilg ◽  
W. Schantl ◽  
H. Vonach ◽  
M. Uhl
Keyword(s):  
Level Density ◽  
Mass Range ◽  
Fermi Gas

scholarly journals Level studies of 73As via 73Ge(p, nγ)73As reaction and density of discrete levels in 73As

2009 ◽  
Vol 24 (2) ◽  
pp. 82-85 ◽  
Author(s):  
Aziz Behkami ◽  
Rohallah Razavi ◽  
Tayeb Kakavand
Keyword(s):  
Proton Beam ◽  
Excited States ◽  
Level Scheme ◽  
Level Density ◽  
Fermi Gas ◽  
Temperature Model ◽  
Nuclear Level Density ◽  
Nuclear Level ◽  
Level Densities ◽  
Experimental Level

The excited states of 73As have been investigated via the 73Ge(p, n?)73As reaction with the proton beam energies from 2.5-4.3 MeV. The parameters of the nuclear level density formula have been determined from the extensive and complete level scheme for 73As. The Bethe formula for the back-shifted Fermi gas model and the constant temperature model are compared with the experimental level densities.

scholarly journals Spallation of 56Fe by 1.0 GeV Protons

2019 ◽  
Vol 26 ◽  
pp. 25
Author(s):  
N. G. Nicolis ◽  
G. S. Souliotis ◽  
A. Asimakopoulou
Keyword(s):  
Gamma Rays ◽  
Cross Sections ◽  
Level Density ◽  
Fermi Gas ◽  
Nuclear Potential ◽  
Density Parameter ◽  
Nuclear Decay ◽  
Intermediate Mass ◽  
Spallation Reactions ◽  
Intranuclear Cascade

Mass, charge and isotopic distributions observed in spallation reactions of 56Fe with 1 GeV protons are analysed in the framework of the intranuclear cascade code ISABEL  coupled with the sequential binary decay code MECO. The code MECO provides a description of the equilibrated nuclear decay by the emission of gamma-rays, light-mass particles and clusters as well as intermediate mass fragments emitted in their ground, excited bound and excited unbound states (continuum) according to a generalized Weisskopf formalism. A good overall description of the experimental data is obtained with a global Fermi gas level density parameter and inverse cross sections based on the Christensen and Winther nuclear potential. Multifragmentation decay events are simulated with the code SMM and their influence on the above observables is discussed.

scholarly journals Fusion-fission in the reactions of the 58Ni + 251Cf and 64Zn + 248Cm combinations

2020 ◽  
Vol 23 (2) ◽  
pp. First
Author(s):  
Duy Ngoc Nguyen
Keyword(s):  
Statistical Model ◽  
Excitation Energy ◽  
Energy Range ◽  
Level Density ◽  
Alpha Decay ◽  
Fermi Gas ◽  
Total Width ◽  
Level Densities ◽  
Decay Widths ◽  
Near Future

Introduction: In the present study, we evaluate the nucleon evaporation, alpha decay, and fission widths in the fusion-fission of the 58Ni+251Cf and 64Zn + 248Cm reactions for the synthesis of the super-heavy 309, 312126 nuclei. Methods: The feasibility of the synthesis of the 309, 312126 isotopes via the mentioned systems is investigated based on the widths. The widths in the excitation energy range of E* = 10 – 100 MeV are calculated in the scope of the statistical model, in which the level density is calculated by using the Fermi-gas model. By employing the LISE++ code, the level densities the compound nuclei, 309, 312126 nuclei, are calculated to be about 105 – 1050 (MeV-1) in the energy range of interest. Results: The lifetime of the compound nuclei, 309, 312126 nuclei, which are estimated based on the total width, is about 10-22-10-20 s. The fission has the largest width compared to those of the alpha decay and nucleon evaporations. Hence, the 58Ni+251Cf and 64Zn + 248Cm combinations are appropriate to the study of the mass distribution. In addition, the large alpha decay widths suggest the 309, 312126 isotopes be the alpha-decay nuclei. Conclusion: The results are expected to be useful for considering measurements at facilities in the near future.

Level density of a Fermi gas with pairing interactions

1985 ◽  
Vol 444 (1) ◽  
pp. 113-132 ◽  
Author(s):  
M.K. Grossjean ◽  
H. Feldmeier
Keyword(s):  
Level Density ◽  
Fermi Gas ◽  
Pairing Interactions

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.

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