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.

Study of level density and reaction cross-sections in Thorium isotopes

2019 ◽  
Vol 34 (12) ◽  
pp. 1950091
Author(s):  
Erumban Ummukulsu ◽  
Nithu Ashok ◽  
Antony Joseph
Keyword(s):  
Cross Sections ◽  
Nuclear Reactions ◽  
Level Density ◽  
Reaction Cross ◽  
Drip Line ◽  
Density Parameter ◽  
Nuclear Level Density ◽  
Talys 1.6 ◽  
Experimental Values ◽  
Thorium Isotopes

A theoretical study of nuclear level density of Thorium nuclei that exist on and off the beta-stability line is carried out using Talys 1.6. The level density parameter a and spin cut-off factor [Formula: see text] for Thorium isotopes [Formula: see text]Th are estimated. The values of both these parameters decrease towards the neutron drip line and the proton drip line. Cross-sections for [Formula: see text] and [Formula: see text] reactions for Thorium isotopes are also calculated. The estimated and experimental values of cross-sections for [Formula: see text]Th are comparable. These evaluated data are useful in understanding the mechanism of nuclear reactions taking place under extreme conditions including those in nucleosynthesis.

scholarly journals Study of the photon strength functions and level density in the gamma decay of the n + 234U reaction

2019 ◽  
Vol 211 ◽  
pp. 02002 ◽  
Author(s):  
J. Moreno-Soto ◽  
E Berthoumieux ◽  
E Dupont ◽  
F Gunsing ◽  
O Serot ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Cross Sections ◽  
High Efficiency ◽  
Level Density ◽  
Reaction Cross ◽  
Level Densities ◽  
Strength Functions ◽  
Gamma Decay ◽  
Reaction Cross Sections ◽  
Nuclear Applications

The accurate calculations of neutron-induced reaction cross sections are relevant for many nuclear applications. The photon strength functions and nuclear level densities are essential inputs for such calculations. These quantities for 235U are studied using the measurement of the gamma de-excitation cascades in radiative capture on 234U with the Total Absorption Calorimeter at n_TOF at CERN. This segmented 4π gamma calorimeter is designed to detect gamma rays emitted from the nucleus with high efficiency. This experiment provides information on gamma multiplicity and gamma spectra that can be compared with numerical simulations. The code DICEBOXC is used to simulate the gamma cascades while GEANT4 is used for the simulation of the interaction of these gammas with the TAC materials. Available models and their parameters are being tested using the present data. Some preliminary results of this ongoing study are presented and discussed.

scholarly journals Systematic study of proton-induced spallation reactions with microscopic and phenomenological models

2019 ◽  
Vol 25 ◽  
pp. 167
Author(s):  
A. Assimakopoulou ◽  
G. A. Souliotis ◽  
N. Nicolis ◽  
M. Veselsky ◽  
A. Bonasera
Keyword(s):  
Experimental Data ◽  
Phenomenological Models ◽  
Cross Section ◽  
Cross Sections ◽  
Fission Cross Section ◽  
Nucleon Nucleon ◽  
Spallation Reactions ◽  
Intranuclear Cascade ◽  
Nucleon Nucleon Interaction ◽  
Dynamical Description

Proton induced spallation reactions on 238U, 208Pb, 181Ta and 197Au targets at high energies were investigated using the microscopic Contrained Molecular Dynamics (CoMD) model and the phenomenological models INC and SMM. We have calculated the total fission cross sections, the ratio fission cross section to residue cross section, the mass yield curves and the excitation energy after the intranuclear cascade using the CoMD model and the INC/SMM phenomenological models. We made a comparison between the models and the experimental data from the liter- ature. Our calculations showed satisfactory agreement with available experimental data and suggest further improvements in the models. Our study with the CoMD code represents the first complete dynamical description of the spallation process with a microscopic code based on an effective nucleon-nucleon interaction.

Cross-sections of 45Sc(n, 2n)44m,gSc reaction from the reaction threshold to 20 MeV

2013 ◽  
Vol 101 (10) ◽  
pp. 607-612 ◽  
Author(s):  
J. Luo ◽  
R. Liu ◽  
L. Jiang ◽  
Z. Liu ◽  
G. Sun ◽  
...  
Keyword(s):  
Cross Section ◽  
Neutron Beam ◽  
Cross Sections ◽  
Level Density ◽  
Nuclear Model ◽  
Absolute Cross Section ◽  
Activation Technique ◽  
Nuclear Decay ◽  
Reaction Threshold ◽  
Model Code

Summary Cross sections of 45Sc(n, 2n)44m,g Sc reactions and their isomeric cross section ratios σm/σg have been measured at three neutron energies between 13.5 and 14.8 MeV using the activation technique. The pure cross section of the groundstate was then obtained by utilizing the absolute cross section of the metastable state and analysis methods of residual nuclear decay. The monoenergetic neutron beam was produced via the 3H(d, n)4He reaction. The cross sections were also estimated with the TALYS-1.2 nuclear model code using different level density options, at neutron energies varying from the reaction threshold to 20 MeV. Results are also discussed and compared with some corresponding values found in the literature.

Investigation of level density parameter dependence for some 233U, 235U, 237U, 239U, 249Cf, 251Cf, 237Pu and 247Cm nuclei in neutron fission cross sections with the incident energy up to 20 MeV

Kerntechnik ◽  
2021 ◽  
Vol 86 (1) ◽  
pp. 78-85
Author(s):  
Ö. Sönmez ◽  
O. Karaman
Keyword(s):  
Cross Sections ◽  
Nuclear Reactions ◽  
Level Density ◽  
Medical Application ◽  
Density Parameter ◽  
Fission Reactions ◽  
Neutron Fission ◽  
Level Density Parameter ◽  
Nuclear Data Library ◽  
The Cross

Abstract Level density models have increasing importance to gain more in-depth into the nature of nuclear reactions. Many novel and advanced medical application use radioisotopes, which are produced with nuclear reactions. In this study, the effect of the level density parameters of the nucleus on the cross sections of neutron-fission reactions for 233U, 235U, 237U, 239U, 249Cf, 251Cf, 237Pu and 247Cm nuclei were investigated for up to 20 MeV neutrons. TALYS 1.8 software was used to calculate the cross-sections of neutron-fission reactions for different level density parameters. The calculations were compared with the EXFOR nuclear data library and the level density parameters, and the closest fit were searched. As outputs of the study, the effect of selection of level density parameter on cross section calculations was observed. The theoretically obtained data were compared with the experimental data taken from the literature. The results are presented graphically for better interpretation.

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