Theoretical determination of (d, n) and (d, 2n) excitation functions of some structural fusion materials irradiated by deuterons

WOS: 000417222800012Nuclear fusion is one of the world's primary energy sources. Studies on the structural fusion materials are very important in terms of the development of fusion technology. Chromium, nickel, zinc, scandium, titanium, and yttrium are important structural fusion materials. In this paper, for use in nuclear science and technology applications, the excitation functions of the Cr-50(d, n)Mn-51, Ni-58(d, n)Cu-59, Zn-64(d, n)Ga-65, Zn-66(d, n)Ga-67, Sc-45(d, 2n)Ti-45, Ti-47(d, 2n)V-47, Ti-48(d, 2n)V-48, and Y-89(d, 2n)Zr-89 nuclear reactions were investigated. The calculations that are based on the pre-equilibrium and equilibrium reaction processes were performed using ALICE-ASH computer code. A comparison with geometry-dependent hybrid model has been made using the initial exciton numbers n(0) = 4-6 and level density parameters alpha = A/5; A/8; A/11. Also, the present model-based calculations were compared with the cross sections obtained using the formulae suggested from our previous studies. Furthermore, the cross section results have been compared with TENDL data based on TALYS computer code and the measured data in the literature

A study on empirical systematic for the (d,n) reaction cross sections at 8.6 MeV

WOS: 000346633500005Recently, many formalizations have been developed to explain some reaction mechanisms such as neutron or proton induced reactions. In this study, (d,n) reaction mechanism was investigated developing the cross-section systematic formula. The (d, n) cross sections at 8.6 MeV deuteron energy have been calculated using these formula for some target nuclei (A = 10 similar to 123). The cross sections calculated are important for the development of fusion reactor technology. Obtained calculation results from the formula have been also compared and discussed with results calculated by the codes ALICE/ASH (equilibrium and pre-equilibrium theories) and TENDL-2012 (Talys-based), and with results of available experimental values. It is shown, that the suggested empirical equation at the 8.6 MeV deuteron energy works very well for a quick estimation of (d,n) nuclear cross sections

Alpha production cross sections for some target fusion structural materials up to 35 mev

WOS: 000320881000006In the next century, because of the worldwide energy shortage, human life will badly be affected. Nuclear fusion energy is the remarkable solution to the rising energy challenges because it has the great potential for sustainability, economic and reliability. There have been many research and development studies to get energy from fusion. Moreover, the neutron induced reaction cross section data around 14-15 MeV are need to the design and development of nuclear fusion reactors. Thus, the working out the systematics of (n,alpha) reaction cross sections is very important and necessary for the definition of the excitation curves at around 14-15 MeV energy. In this study, neutron induced reaction cross sections for structural fusion materials such as Sc (Scandium), Co (Cobalt), Ni (Nickel), Cu (Copper), Y (Yttrium), Mo (Molybdenum), Zr (Zirconium) and Nb (Niobium) have been investigated for the (n,alpha) reactions. The new calculations on the excitation functions of (45) Sc(n,a) (42) K, (59) Co (n,a) (56) Mn, (62) Ni(n,a) (59) Fe, (63) Cu(n,a) (60) Co, (65) Cu(n,a) (62) Co, (89) Y(n,a) (86) Rb, (92) Mo(n,a) (89) Zr, (98) Mo(n,a) (95) Zr, (92) Zr(n,a) (89) Sr, (94) Zr(n,a) (91) Sr and (93) Nb(n,a) (90) Y reactions have been carried out up to 35 MeV incident neutron energies. In these calculations, the pre-equilibrium and equilibrium effects have been investigated. The pre-equilibrium calculations involve the new evaluated the geometry dependent hybrid model, hybrid model and the cascade exciton model. The equilibrium effects of the excitation functions for the investigated reactions are calculated according to the Weisskopf-Ewing model. Additionaly, in the present work, the (n,alpha) reaction cross sections have calculated by using evaluated empirical formulas developed by Tel et al. at 14-15 MeV energy. The calculated results have been discussed and compared with the available experimental data taken from EXFOR database

A systematic study for cross sections on (d, 2n) nuclear reactions between 11.57 and 18.91 MeV

WOS: 000376020900017The cross sections of deuteron-induced nuclear reactions have a critical importance on future fusion devices. In this study, the Coulomb and asymmetry term effects for the cross sections of (d, 2n) nuclear reactions have been investigated. The reaction cross sections have been calculated by using empirical formulas depended on the asymmetry parameter for incident deuteron energies between 11.57 and 18.91 MeV. The results obtained from the formulas have been discussed and compared with the TENDL-2013 online library data, the code ALICE/ASH calculations (equilibrium Weisskopf Ewing, pre-equilibrium hybrid and geometry dependent hybrid theories) and the experimental values in literature. The present empirical formulas predictions of the reaction cross sections show generally good agreement with the model results and experimental values

Theoretical study of deuteron induced reactions on Li-6,Li-7, Be-9 and F-19 targets

WOS: 000334145300009The nuclear reactions of the deuteron particles with light nuclei have been extensively investigated in the history of nuclear physics. In this work, the cross-sections of deuteron reactions Li-6(d,n)Be-7, Li-6(d,t)Li-5, Li-7(d,2n)Be-7, Li-7(d,p)Li-8, Li-7(d,t)Li-6, Be-9(d,p)Be-10, Be-9(d,t)Be-8, F-19(d,n)Ne-20 and F-19(d,p)F-20 were studied for the investigation of structural fusion materials. Excitation functions of these reactions were determined by using ALICE-ASH code considering equilibrium (EQ) and preequilibrium (PEQ) effects. The calculated cross-sections, experimental results and TENDL-2011 library data are presented in graphical form

Reaction cross sections in the interactions of neutrons with Yttrium nucleus

WOS: 000362957300023In this research, the cross sections of the nuclear reactions Y-88(n, 2n)Y-87, Y-89(n, 2n)Y-88, Y-89(n, 3n)Y-87, Y-89(n, p)Sr-89, Y-89(n, d)Sr-88, Y-90(n, 2n) Y-89 and Y-90(n, p)Sr-90 have been calculated using advanced nuclear models at incident neutron energies up to 40 MeV. The theoretical values of nuclear cross sections for these reactions have been estimated by the computer codes ALICE-ASH, PCROSS and CEM03.01. Effect on the cross sections of level density parameters used in the calculations has also been discussed. Finally, the excitation function systematics have been observed with a significant contribution to obtain the nuclear cross sections for bombardment energy range of 14-15 MeV

Cross section systematics of (d,p) reactions at 8.5 MeV

WOS: 000347265100005The empirical and semi-empirical systematics of the (d,p) nuclear reaction cross sections were obtained at the incident deuteron energies of 8.5 MeV. The experimental values for (d,p) reaction cross sections were collected from the literature and analyzed for the some target nuclei 27 <A< 121. The obtained cross section formulas by fitting two parameters for the (d,p) nuclear reactions were given. The obtained cross section results by using the systematics for (d,p) nuclear reactions have been discussed and compared with the ALICE-ASH code calculations and the available experimental data. Finally, the semi-empirical cross section formula gives a good fit with the experimental values for the (d,p) nuclear reaction

Study on (n,2n) and (n,p) reactions of strontium nucleus

WOS: 000364161800010The cross sections for (n,2n) and (n,p) nuclear reactions on Sr-84,Sr-86,Sr-88,Sr-90 target nuclei up to 30 MeV from threshold have been investigated. The determination of the cross sections has been done employing the codes ALICE/ASH, PCROSS, CEM03.01 which taking into consideration compound and precompound emissions. Calculations have been performed by using the Weisskopf Ewing model (WEM) of compound reaction mechanism, and the Hybrid model (HM), Geometry Dependent Hybrid model (GDHM) and Full Exciton model (FEM) of precompound reaction mechanism, and Cascade Exciton model (CEM) including Cascade interactions, and the empirical and semi-emipirical systematics. In order to test the theoretical nuclear models, the data obtained from the excitation function calculations are discussed and compared with available experimental values, ENDF/B-VII.1 and TENDL-2014 libraries. Finally the new cross section results calculated in the present paper may be useful for nuclear energy applications. (C) 2015 Elsevier B.V. All rights reserved

Study on (n,t) Reactions of Zr, Nb and Ta Nuclei

WOS: 000300783000015The world faces serious energy shortages in the near future. To meet the world energy demand, the nuclear fusion with safety, environmentally acceptability and economic is the best suited. Fusion is attractive as an energy source because of the virtually inexhaustible supply of fuel, the promise of minimal adverse environmental impact, and its inherent safety. Fusion will not produce CO2 or SO2 and thus will not contribute to global warming or acid rain. Furthermore, there are not radioactive nuclear waste problems in the fusion reactors. Although there have been significant research and development studies on the inertial and magnetic fusion reactor technology, there is still a long way to go to penetrate commercial fusion reactors to the energy market. Because, tritium self-sufficiency must be maintained for a commercial power plant. For self-sustaining (D-T) fusion driver tritium breeding ratio should be greater than 1.05. And also, the success of fusion power system is dependent on performance of the first wall, blanket or divertor systems. So, the performance of structural materials for fusion power systems, understanding nuclear properties systematic and working out of (n,t) reaction cross sections are very important. Zirconium (Zr), Niobium (Nb) and Tantal (Ta) containing alloys are important structural materials for fusion reactors, accelerator-driven systems, and many other fields. In this study, (n,t) reactions for some structural fusion materials such as Zr-88,Zr-90,Zr-92,Zr-94,Zr-96, Nb-93,Nb-94,Nb-95 and Ta-179,Ta-181 have been investigated. The calculated results are discussed andcompared with the experimental data taken from the literature

Investigation of the ground state features of some excotic nuclei by using effective skyrme interaction

Nuclear many-body system is usually described through a mean-field built upon a nucleon-nucleon effective interaction. This interaction has been developed over the years for both stable and unstable nuclei as precise spectroscopic data has been built up. In this study, the proton and neutron densities, charge densities, root mean square (rms) nuclear charge radii, rms nuclear mass radii, rms nuclear proton and. neutron radii, and neutron skin thickness were calculated for the neutron-rich Ni, Kr and Sn isotopes by the Hartree-Fock method with an effective Skyrme force based on nucleon-nucleon interactions known as SI, SIII, SVI, T3, SKM and SKM*. The results obtained via theoretical approach are close to experimental observations.Nuclear many-body system is usually described through a mean-field built upon a nucleon-nucleon effective interaction. This interaction has been developed over the years for both stable and unstable nuclei as precise spectroscopic data has been built up. In this study, the proton and neutron densities, charge densities, root mean square (rms) nuclear charge radii, rms nuclear mass radii, rms nuclear proton and. neutron radii, and neutron skin thickness were calculated for the neutron-rich Ni, Kr and Sn isotopes by the Hartree-Fock method with an effective Skyrme force based on nucleon-nucleon interactions known as SI, SIII, SVI, T3, SKM and SKM*. The results obtained via theoretical approach are close to experimental observations