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ABSTRACT: In this study, neutron-emission spectra produced by (α,xn) reactions for some structural fusion materials such as 27Al, 53Cr, 56Fe and 58,60,62Ni have been investigated. Hybrid model, geometry dependent hybrid model and full exciton model have been used to calculate
the pre-equilibrium neutron-emission spectra. For the reaction equilibrium component, Weisskopf–Ewing model calculations have
been preferred. The mean free path parameter’s effect for (α,xn) neutron-emission spectra has been examined. The obtained results have been discussed and compared with the available experimental
data and found agreement with each other.
KeywordsAlpha-induced reactions-Geometry dependent hybrid model-Neutron emission spectra-(α,xn) Cross-section
Journal of Fusion Energy 05/2012; 29(4):353-359. · 0.52 Impact Factor
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ABSTRACT: High-current proton accelerator technologies make use of spallation neutrons produced in (p,xn) and (n,xn) nuclear reactions on high-Z targets. The produced neutrons are moderated by heavy water. These moderated neutrons are subsequently
captured on 3He to produce tritium via the (n,p) reaction. Tritium self-sufficiency must be maintained for a commercial power plant. So, working out the systematics of (n,t) reaction cross sections and triton emission differential data are important for the given reaction taking place on various
nuclei at different energies. In this study, triton emission spectra by using ultra-fast neutrons (incident neutron energy
>50MeV), the (n,xt) reactions for some target nuclei as 16O, 27Al, 56Fe, 59Co, 208Pb and 209Bi have been investigated. In the calculations, the pre-equilibrium and equilibrium effects have been used. The calculated
results have been compared with the experimental data taken from the literature.
KeywordsUltra-fast neutron-Geometry dependent hybrid model-Triton emission spectra-(n,xt) Cross-section
Journal of Fusion Energy 05/2012; 29(4):322-326. · 0.52 Impact Factor
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ABSTRACT: Deuterons are weakly bound nuclei which easily undergo break up reactions. This is well known at low energies, around 10MeV,
where deuteron beams have been used to produce neutrons very efficiently. These neutrons have a widely application field such
as fission energy production and hybrid reactor systems. In this study, neutron emission cross sections produced by (d,2n)
reactions for spallation neutron targets such as 52Cr, 56Fe, 60,62,64Ni, 63,65Cu, 182,183,184,186W, 232Th, 235U and 238U have been investigated. Hybrid model and geometry dependent hybrid model were used to calculate the pre-equilibrium neutron-emission
cross sections. For the reaction equilibrium process, Weisskopf–Ewing model calculations were selected. The obtained results
have been discussed and compared with the available experimental data and found agreement with each other.
KeywordsDeuteron-induced reactions-Neutron emission cross section-Equilibrium reactions-Pre-equilibrium reactions
Journal of Fusion Energy 04/2012; 29(2):181-187. · 0.52 Impact Factor
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ABSTRACT: Palladium, which is a rare and lustrous silvery-white color from precious metals, plays important role in fusion–fission reactions
and different fields of nuclear technology. In addition, it is used for not only cold fusion experiments but also separation
of hydrogen isotopes researches for fusion reactors. In this study, neutron-emission spectra produced by (p,xn) reactions
for structural fusion material 104,105,106,108,110Pd isotopes have been investigated by a proton beam at 21.6MeV. Moreover, multiple pre-equilibrium mean free paths constant
from internal transition, and the pre-equilibrium and equilibrium level density parameters have been analyzed for some (p,xn)
neutron-emission spectra calculated. New evaluated hybrid model and geometry dependent hybrid model, full exciton model and
cascade exciton model were used to calculate the pre-equilibrium neutron-emission spectra. For the reaction equilibrium component,
Weisskopf–Ewing model calculations were preferred. The obtained results have been discussed and compared with the available
experimental data and found agreement with each other.
Journal of Fusion Energy 04/2012; 29(1):41-48. · 0.52 Impact Factor
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ABSTRACT: 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. 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. So, working out the systematics of (n,t) reaction cross sections and triton emission differential data are important for the given reaction taking place on various
nuclei at different energies. In this study, (n,xt) reactions for some target nuclei as 16O, 27Al, 59Co and 209Bi have been investigated up to 45MeV incident neutron energy. In the calculations of the triton emission spectra, the pre-equilibrium
and equilibrium effects have been used. The calculated results have been compared with the experimental data taken from the
literature.
KeywordsTriton emission spectra-Pre-equilibrium reactions-(n,xt) Cross-section
Journal of Fusion Energy 04/2012; 29(4):312-316. · 0.52 Impact Factor
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ABSTRACT: The nuclear data on (α, xn) reactions are very important in the fields of radiation shielding, long-term safe handling of spent fuel and spallation neutron-production. In this study, neutron-production cross sections have been calculated for some target nuclei such as 65Cu and 209Bi. Hybrid model and geometry dependent hybrid model have been used to calculate the pre-equilibrium neutron-production cross sections. The mean free path parameter’s effect for (α, xn) neutron-production cross section has been examined. The obtained results have been discussed and compared with the available experimental data.
Annals of Nuclear Energy 37(10):1316-1320. · 0.90 Impact Factor
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ABSTRACT: There are many application fields for fast neutrons. The main application fields of the fast neutrons are accelerator-driven sub-critical systems (ADS) and fusion–fission (hybrid) reactor systems for fission energy production. Thorium (Th) and uranium (U) are nuclear fuels in fusion–fission (hybrid) reactor systems and bismuth (Bi) is also the target nucleus in the ADS reactor systems. In this study, neutron production cross sections produced by (d, xn) reactions for spallation targets such as 209Bi, 232Th, 235U and 238U have been investigated. New evaluated hybrid model and geometry dependent hybrid model have been used to calculate the pre-equilibrium neutron production cross sections. For the reaction equilibrium component, Weisskopf–Ewing model calculations have been preferred. The obtained results have been discussed and compared with the available experimental data and found in agreement with each other.
Annals of Nuclear Energy.
