Pre-equilibrium cross section calculations in alpha induced reactions on Cu-65 and Bi-209

WOS: 000280938500007The nuclear data on (alpha, 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 Cu-65 and Bi-269. 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 (alpha, xn) neutron-production cross section has been examined. The obtained results have been discussed and compared with the available experimental data. (C) 2010 Elsevier Ltd. All rights reserved

Neutron Emission Spectra of Some Structural Fusion Materials at 26.8 and 45.2 MeV Alpha Incident Energies

WOS: 000279692700009In this study, neutron-emission spectra produced by (alpha,xn) reactions for some structural fusion materials such as Al-27, Cr-53, Fe-56 and Ni-58,Ni-60,Ni-62 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 (alpha,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

Calculation of Proton Total Reaction Cross Sections for Some Target Nuclei in Incident Energy Range of 10-600 MeV

Yildirim, Gurcan/0000-0002-5177-3703WOS: 000284870700006In this study, proton total reaction cross sections have been investigated for some isotopes such as (12)C, (27)Al, (9)Be, (16)O, (181)Ta, (197)Au, (6)Li, and (14)N by a proton beam up to 600 MeV. Calculation of the proton total cross sections has been carried out by the analytic expression formulated by M.A. Alvi by using Coulomb-modified Glauber theory with the Helm model nuclear form factor. The obtained results have been discussed and compared with the available experimental data and found to be in agreement with each other

Excitation Functions of Some Neutron Production Targets on (d,2n) Reactions

Bolukdemir, Mustafa/0000-0002-7911-7863; Bolukdemir, Mustafa Hicabi/0000-0002-7911-7863; Yildirim, Gurcan/0000-0002-5177-3703WOS: 000275414600016Deuterons are weakly bound nuclei which easily undergo break up reactions. This is well known at low energies, around 10 MeV, 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 Cr-52, Fe-56, Ni-60,Ni-62,Ni-64, Cu-63,Cu-65, W-182,W-183,W-184,W-186, Th-232, U-235 and U-238 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.State Planning Organization of TurkeyTurkiye Cumhuriyeti Kalkinma Bakanligi [DPT-2006 K 120470]This work has been supported by State Planning Organization of Turkey project DPT-2006 K # 120470. The authors would like to thank C. H. M. Broeders, A. Yu. Konobeyev, Yu. A. Korovin, V. P. Lunev, M. Blann for supporting of ALICE/ASH code and for encouragement our present study

Investigation of the neutron emission spectra of some deformed nuclei for (n,xn) reactions up to 26 MeV energy

Bolukdemir, Mustafa Hicabi/0000-0002-7911-7863; Bolukdemir, Mustafa/0000-0002-7911-7863WOS: 000298231100005In this study, neutron-emission spectra produced by (n,xn) reactions up to 26 MeV for some deformed target nuclei as (165)Ho, (181)Ta, (184)W, (232)Th and (238)U have been investigated. Also, the mean free path parameter's effect for (n,xn) neutron-emission spectra has been examined. In the calculations, pre-equilibrium neutron-emission spectra have been calculated by using new evaluated hybrid model and geometry dependent hybrid model, full exciton model and cascade exciton model. The reaction equilibrium component has been calculated by Weisskopf-Ewing model. The obtained results have been discussed and compared with the available experimental data and found agreement with each other.State Planning Organization of TurkeyTurkiye Cumhuriyeti Kalkinma Bakanligi [DPT-2006K, 120470]This work has been supported by State Planning Organization of Turkey project DPT-2006K # 120470. The authors would like to thank C H M Broeders, A Yu Konobeyev, Yu A Korovin, V P Lunev and M Blann for supporting of ALICE/ASH code and for encouragement our present study

Triton Emission Spectra in Some Target Nuclei Irradiated by Ultra-Fast Neutrons

WOS: 000279692700004High-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 (3)He 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 > 50 MeV), the (n,xt) reactions for some target nuclei as (16)O, (27)Al, (56)Fe, (59)Co, (208)Pb and (209)Bi 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.Gazi UniversityGazi University [05/2009-50]This work has been supported by the project of Gazi University project (BAP), Code No: 05/2009-50

Neutron Emission Spectra of <SUP>104,105,106,108,110</SUP>Pd Isotopes for (p,xn) Reactions at 21.6 MeV Proton Incident Energy

Yildirim, Gurcan/0000-0002-5177-3703WOS: 000273787900010Palladium, 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 21.6 MeV. 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.State Planning Organization of TurkeyTurkiye Cumhuriyeti Kalkinma Bakanligi [DPT-2006 K 120470]This work has been supported by State Planning Organization of Turkey project DPT-2006 K # 120470. The authors would like to thank C. H. M. Broeders, A. Yu. Konobeyev, Yu. A. Korovin, V. P. Lunev, M. Blann for supporting of ALICE/ASH code and for encouragement our present study

Theoretical cross sections of Bi-209, Th-232, U-235 and U-238 on deuteron-induced reactions

Bolukdemir, Mustafa Hicabi/0000-0002-7911-7863; Bolukdemir, Mustafa/0000-0002-7911-7863; Yildirim, Gurcan/0000-0002-5177-3703WOS: 000276823700011There 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 Bi-209, Th-232, U-235 and U-238 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. (C) 2010 Elsevier Ltd. All rights reserved

The Equilibrium and Pre-equilibrium Triton Emission Spectra of Some Target Nuclei for (n,xt) Reactions up to 45 MeV Energy

Ozkorucuklu, Suat/0000-0001-5153-9266; Yildirim, Gurcan/0000-0002-5177-3703WOS: 000279692700002Although 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 (16)O, (27)Al, (59)Co and (209)Bi have been investigated up to 45 MeV 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.State Planning Organization of TurkeyTurkiye Cumhuriyeti Kalkinma Bakanligi [120470]This work has been supported by State Planning Organization of Turkey project DPT-2006K # 120470

Production cross sections of medical In-110,In-111 radionuclides

Bolukdemir, Mustafa Hicabi/0000-0002-7911-7863; Bolukdemir, Mustafa/0000-0002-7911-7863WOS: 000277832100006In this study, production routes of medical In-110,In-111 radio-nuclides produced by Cd-110(p, n)In-110, Cd-111(p, 2n)In-110, (112)cd(p, 3n)In-110, Ag-107(alpha, n)In-110, Ag-109(alpha, 3n)In-110, Cd-111(p, n)In-111, Cd-112(p, 2n)In-111, Cd-113(p, 3n)In-111, Cd-114(p, 4n)In-111, Ag-109(alpha, 2n)In-111, Ag-107(alpha, gamma)In-111 and In-113(n, 3n)In-111 reactions have been investigated up to 70 MeV incident particle energy. In these calculations, the pre-equilibrium and equilibrium effects have been investigated. The pre-equilibrium calculations involve the geometry dependent hybrid model and the cascade exciton model. The full exciton model has also been used to investigate the pre-equilibrium direct effects. Equilibrium effects are calculated according to the Weisskopf-Ewing model. The calculated results are compared with the experimental data taken from the literature