Width of fission-fragment mass yield at simple statistical approach

2018 ◽  
Vol 27 (01) ◽  
pp. 1850002
Author(s):  
V. Yu. Denisov ◽  
O. A. Belyanovska ◽  
V. P. Khomenkov ◽  
I. Yu. Sedykh ◽  
K. M. Sukhyy
Keyword(s):  
Energy Level ◽  
Fission Fragment ◽  
Statistical Approach ◽  
Level Density ◽  
Simple Expression ◽  
Density Parameter ◽  
Mass Yield ◽  
Excitation Energies ◽  
Level Density Parameter ◽  
Fragment Mass

Simple expression for the temperature dependence of the width of fission-fragment mass yields is obtained for high excitation energies. The width depends on the number of nucleons in nuclei, the volume and surface terms of the energy level density parameter, the temperature and the stiffness parameter of the potential related to mass-asymmetric degree of freedom. The contribution of the surface term of the energy level density parameter into the width is important at temperatures [Formula: see text][Formula: see text]MeV.

scholarly journals The nuclear level density parameter

2019 ◽  
Vol 11 (20) ◽  
pp. 35-46
Author(s):  
Rasha S. Ahmed
Keyword(s):  
Level Density ◽  
State Density ◽  
Density Parameter ◽  
Nuclear Level Density ◽  
Excitation Energies ◽  
Nuclear Level ◽  
Level Density Parameter ◽  
Experimental Works ◽  
Experimental Values ◽  
Energy Dependent

The nuclear level density parameter  in non Equi-Spacing Model (NON-ESM), Equi-Spacing Model (ESM) and the Backshifted Energy Dependent Fermi Gas model (BSEDFG) was determined for 106 nuclei; the results are tabulated and compared with the experimental works. It was found that there are no recognizable differences between our results and the experimental -values. The calculated level density parameters have been used in computing the state density as a function of the excitation energies for 58Fe and 246Cm nuclei. The results are in a good agreement with the experimental results from earlier published work.

FISSION TIME OF α-INDUCED REACTIONS MEASURED BY THE CRYSTAL BLOCKING TECHNIQUE

2010 ◽  
Vol 19 (05n06) ◽  
pp. 1227-1235 ◽  
Author(s):  
V. A. DROZDOV ◽  
D. O. EREMENKO ◽  
O. V. FOTINA ◽  
S. Yu. PLATONOV ◽  
O. A. YUMINOV ◽  
...  
Keyword(s):  
Fission Fragment ◽  
Statistical Approach ◽  
Reliable Information ◽  
Fission Barrier ◽  
Large Set ◽  
Angular Anisotropy ◽  
Excitation Energies ◽  
Shell Effects ◽  
Pu Isotopes ◽  
Nuclear Dissipation

A large set of experimental observables for the 232 Th , 235 U (α, xnf ) reactions has been analyzed within the dynamic-statistical approach with allowance for the nuclear dissipation phenomenon, the double humped structure of fission barrier, and also the temperature damping of shell effects. The energy dependences of the lifetime effect (experimentally measured by the crystal blocking technique) along the corresponding data on the fission fragment angular anisotropy and also fission probabilities of U and Pu isotopes produced in the reactions were chosen for the analysis. Reliable information on the nuclear viscosity at the low excitation energies (< 30 MeV) was obtained.

Temperature and isospin dependence of the level-density parameter in the A≈110 mass region

2020 ◽  
Vol 102 (5) ◽  
Author(s):  
G. K. Prajapati ◽  
Y. K. Gupta ◽  
B. V. John ◽  
B. N. Joshi ◽  
Harjeet Kaur ◽  
...  
Keyword(s):  
Level Density ◽  
Mass Region ◽  
Density Parameter ◽  
Level Density Parameter ◽  
Isospin Dependence

Effects of level density parameter on the superheavy production in cold fusion

2014 ◽  
Vol 29 (40) ◽  
pp. 1450214 ◽  
Author(s):  
M. R. Pahlavani ◽  
S. A. Alavi
Keyword(s):  
Cross Section ◽  
Neutron Emission ◽  
Level Density ◽  
Cold Fusion ◽  
Heavy Ion ◽  
Evaporation Residue ◽  
Density Parameter ◽  
Fusion Reactions ◽  
Level Density Parameter ◽  
Evaporation Residue Cross Section

By using semiclassical method and considering Woods–Saxon and Coulomb potentials, the level density parameter a was calculated for three superheavy nuclei 270110, 278112 and 290116. Obtained results showed that the value of level density parameter of these nuclei is near to the simple relation a ≈ A/10. In framework of the dinuclear system model, the effects of level density parameter on the probability of the formation of a compound nucleus, the ratio of neutron emission width and fission width, and evaporation residue cross-section of three cold fusion reactions 62 Ni +208 Pb , 70 Zn +208 Pb and 82 Se +208 Pb , leading to superheavy elements were investigated. The findings indicate that the level density parameter play a significant role in calculations of heavy-ion fusion–fission reactions. The obtained results in the case of a = A/12 have larger values in comparison with calculated level density parameter with Woods–Saxon potential (a WS ) and a = A/10. The theoretical results of the evaporation residue cross-section are very sensitive to the choice of level density parameter. The calculated values with a WS are in good agreement with experimental values.

scholarly journals Angular momentum dependence of the nuclear level density parameter

2014 ◽  
Vol 66 ◽  
pp. 03073 ◽  
Author(s):  
M. Gohil ◽  
Pratap Roy ◽  
K. Banerjee ◽  
S. Bhattacharya ◽  
C. Bhattacharya ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Level Density ◽  
Density Parameter ◽  
Momentum Dependence ◽  
Nuclear Level Density ◽  
Nuclear Level ◽  
Level Density Parameter
Sign in / Sign up

Export Citation Format

Share Document