scholarly journals Theoretical Calculations of the Cross-sections for (n,α) and (n,xα) reactions on the Structural Material for Fusion Reactor 46-50Ti

2021 ◽  
Vol 19 (50) ◽  
pp. 9-19
Author(s):  
Rıdvan Baldık
Keyword(s):  
Structural Material ◽  
Cross Sections ◽  
Fusion Reactor ◽  
Theoretical Calculations ◽  
Level Density ◽  
Fusion Energy ◽  
Structural Materials ◽  
Fusion Product ◽  
Incident Neutron ◽  
Nuclear Level Density

The biggest problem of structural materials for fusion reactor is the damage caused by the fusion product neutrons to the structural material. If this problem is overcomed, an important milestone will be left behind in fusion energy. One of the important problems of the structural material is that nuclei forming the structural material interacting with fusion neutrons are transmuted to stable or radioactive nuclei via (n, x) (x; alpha, proton, gamma etc.) reactions. In particular, the concentration of helium gas in the structural material increases through deuteron- tritium (D-T) and (n, α) reactions, and this increase significantly changes the microstructure and the properties of the structural materials. Therefore, in this study, the effects of the different nuclear level density models on the excitation functions of the (n, α) reactions on 46-50Ti isotopes, an attractive candidate for the structural material for fusion reactors, have been investigated for the first time. Also, the differential cross-sections with respect to alpha energy for the emission of alpha particles of the 46-50Ti (n, xα) reactions have been investigated at 14.1 MeV incident neutron energy. The calculations are performed using the two-component exciton model in the TALYS 1.9 code, and the results are compared with available experimental data. The results of this study will contribute to nuclear database as required for improving, design and operations of the important facilities as ITER (International Thermonuclear Experimental Reactor), DEMO (The demonstration power plant) and ENS (European Nuclear Society).

Cross sections for d-3H neutron interactions with samarium isotopes

2016 ◽  
Vol 104 (8) ◽  
Author(s):  
Junhua Luo ◽  
Chunlei Wu ◽  
Li Jiang ◽  
Long He
Keyword(s):  
Experimental Data ◽  
Neutron Flux ◽  
Cross Sections ◽  
Theoretical Calculations ◽  
Nuclear Model ◽  
Activation Technique ◽  
Incident Neutron ◽  
Reaction Threshold ◽  
Talys 1.6 ◽  
The Cross

Abstract:The cross sections for (n,x) reactions on samarium isotopes were measured at (d-T) neutron energies of 13.5 and 14.8 MeV with the activation technique. Samples were activated along with Nb and Al monitor foils to determine the incident neutron flux. Theoretical calculations of excitation functions were performed using the nuclear model codes TALYS-1.6 and EMPIRE-3.2 Malta with default parameters, at neutron energies varying from the reaction threshold to 20 MeV. The results were discussed and compared with experimental data found in the literature. At neutron energies 13.5 and 14.8 MeV, the cross sections of the

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.

Fast Neutron Cross Sections and Nuclear Level Density

1953 ◽  
Vol 91 (6) ◽  
pp. 1423-1429 ◽  
Author(s):  
D. J. Hughes ◽  
R. C. Garth ◽  
J. S. Levin
Keyword(s):  
Fast Neutron ◽  
Cross Sections ◽  
Level Density ◽  
Nuclear Level Density ◽  
Nuclear Level ◽  
Neutron Cross Sections

scholarly journals 237Np reactions with fast neutrons: a phenomenological study

2020 ◽  
Vol 27 ◽  
pp. 14
Author(s):  
I. Sideris ◽  
S. Kolovi ◽  
A. Khaliel ◽  
A. Stamatopoulos ◽  
T. J. Mertzimekis
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Phenomenological Study ◽  
Theoretical Calculations ◽  
Level Density ◽  
Strength Function ◽  
Space Mission ◽  
Fast Neutrons ◽  
Spent Fuel ◽  
Section Data

Neptunium presents various opportunities as nuclear fuel, especially in deep–space mission power generators. As it is part of the nuclear spent fuel in PWR, waste management concerns due to 237Np long α-emitting half-life have attracted some attention recently. The scarcity of experimental data in the fast neutron energy range highlights the necessity to investigate the radiative neutron capture and neutron–induced fission cross sections of this radioisotope. In the present work, statistical modeling of these reactions is performed using TALYS in an extended range of neutron energies between 10 keV and 20 MeV. In total, 72 different combinations of code parameters were selected to study the level density and γ-strength function dependence of the cross section in 238Np. Preequilibrium and compound nucleus formation phenomena are also examined. Theoretical calculations are compared to available experimental total cross section data found in literature in an attempt to investigate any discrepancies between experiment and theory and validate statistical uncertainties.

scholarly journals The effect of deformation parameter of heavy nuclei on level density parameter

2019 ◽  
Vol 12 (25) ◽  
pp. 38-43
Author(s):  
Mahdi Hadi Jasim
Keyword(s):  
Cross Sections ◽  
Collective Motion ◽  
Level Density ◽  
Reaction Cross ◽  
Neutron Resonance ◽  
Density Parameter ◽  
Heavy Nuclei ◽  
Nuclear Level Density ◽  
S Wave ◽  
Level Density Parameter

The possible effect of the collective motion in heavy nuclei has been investigated in the framework of Nilson model. This effect has been searched realistically by calculating the level density, which plays a significant role in the description of the reaction cross sections in the statistical nuclear theory. The nuclear level density parameter for some deformed radioisotopes of (even- even) target nuclei (Dy, W and Os) is calculated, by taking into consideration the collective motion for excitation modes for the observed nuclear spectra near the neutron binding energy. The method employed in the present work assumes equidistant spacing of the collective coupled state bands of the considered isotopes. The present calculated results for first excited rotational band have been compared with the accumulated values from the literature for s-wave neutron resonance data, and were in good agreement with those data.

Measurement of cross sections and isomeric cross-section ratios for the (n,2n) reactions on 85,87Rb in energies between 13 and 15 MeV

2018 ◽  
Vol 106 (9) ◽  
pp. 709-717
Author(s):  
Junhua Luo ◽  
Li Jiang ◽  
Long He
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Neutron Generator ◽  
Level Density ◽  
Reaction Cross ◽  
Absolute Cross Section ◽  
Incident Neutron ◽  
Neutron Energy Range ◽  
Engineering Physics ◽  
Talys 1.8 Code

Abstract The (n,2n) cross sections and their isomeric cross-section ratios (σm/σg) in the neutron energy range 13–15 MeV have been measured for 85,87Rb by an activation and off-line γ-ray spectrometric technique using the Pd-300 Neutron Generator at the Chinese Academy of Engineering Physics (CAEP). The natural Rb samples and Nb monitor foils were activated together to determine the reaction cross section and the incident neutron flux. The neutrons were produced via the 3H(d,n)4He reaction. The pure cross section of the ground-state was derived from the absolute cross section of the metastable state and the residual nuclear decay analysis. The 85Rb(n,2n)84m,gRb and 87Rb(n,2n)86m,gRb reaction excitation functions and their isomeric cross-section ratios were also calculated theoretically using the TALYS-1.8 code with different level density options. Results are discussed and compared with the corresponding literature data.

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