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Application of asymmetry depending empirical formulas for (p,nα) reaction cross-sections at 24.8 and 28.5 MeV incident energies
(Pergamon-Elsevier Science Ltd, 2009) Tel, Eyüp; Aydın, Emine Gamze; Aydın, Abdullah; Kaplan, Abdullah
In this study, we have investigated the asymmetry term effect for the (p,n alpha) reaction cross-sections and we have obtained new coefficients for the (p,n alpha) reactions at 24.8 and 28.5 MeV energies. We have suggested empirical formulas including the new coefficients found by fitting two parameters for proton induced reactions. The coefficients were determined by least-squares fitting method. The obtained cross-section formulas with new coefficients have been discussed and compared with the available experimental data. (C) 2008 Elsevier Ltd. All rights reserved.
Calculation of Proton Total Reaction Cross Sections for Some Target Nuclei in Incident Energy Range of 10-600 MeV
(Maik Nauka/Interperiodica/Springer, 2010) Büyükuslu, Halim; Kaplan, Abdullah; Aydın, Aduallah; Tel, Eyüp; Yıldırım, Gürcan
In 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.
Calculations of the main free path on neutron emission cross-section for spallation reaction of target and fuel nuclei
(2007) Tel, Eyyüp; Kişoğlu, H.Fatih; Topaksu, A.Kayış; Aydın, Abdullah; Kaplan, Abdullah
There are several new technological application fields of fast neutrons such as accelerator-driven incineration/ transmutation of the long-lived radioactive nuclear wastes (in particular transuranium nuclides) to short-lived or stable isotopes by secondary spallation neutrons produced by high-intensity, intermediate-energy, charged-particle beams, prolonged planstary space missions, shielding for particle accelerators. Especially, accelerator driven subcritical systems (ADS) can be used for fission energy production and /or nuclear waste transmutation as well as in the intermediate-energy accelerator driven neutron sources, ions and neutrons with energies beyond 20 MeV, the upper limit of exiting data files that produced for fusion and fission applications. In these systems, the neutron scattering cross sections and emission differential data are very important for reactor neutronics calculations. The transition rate calculation involves the introduction of the parameter of mean free path determines the mean free path of the nucleon in the nuclear matter. This parameter allows an increase in mean free path, with simulation of effect, which is not considered in the calculations, such as conservation of parity and angular momentum in intra nuclear transitions. In this study, we have investigated the multiple pre-equilibrium matrix element constant from internal transition for Uranium, Thorium, (n,xn) neutron emission spectra. The neutron-emission spectra produced by (n,xn) reactions on nuclei of some target (for spallation) have been calculated. In the calculations, we have used the geometry dependent hybrid model and the cascade exciton model including the effects of the pre-equilibrium. The pre-equilibrium direct effects have been examined by using full exciton model. All calculated results have been compared with the experimental data. The obtained results have been discussed and compared with the available experimental data and found agreement with each other.
Comparison of fission barrier and level density models for (alpha,f) reaction of some heavy nuclei
(Pergamon-Elsevier Science Ltd, 2014) Sarpun, Ismail H.; Aydin, Abdullah; Kaplan, Abdullah; Koca, Hulya; Tel, Eyyup
In this work, alpha induced fission reactions for some heavy nuclei (Th-232, U-235, U-238, Np-237 and Pu-238) are calculated based on both fission barrier models and level density models by using the TALYS 1.2 code. The calculations are compared with experimental data which are available in EXFOR library. Sierk fission barrier model shows the best agreement with data among the five fission barrier models and also calculations show that there is no distinction in the level density models for the (alpha,f) reaction of the nuclei studied for atomic numbers larger than 230. (C) 2014 Elsevier Ltd. All rights reserved.
Determination of (n,2n) Reaction Cross Sections for Some Nuclei with Asymmetry Parameter
(Springer, 2010) Sarpun, İsmail Hakkı; Yalim, Hüseyin Ali; Ünal, Rıdvan; Oruncak, Bekir; Aydin, Abdullah; Kaplan, Abdullah; Tel, Eyüp
The (n,2n) reaction cross sections for targets of Tl-203,Tl-205, Pb-204,Pb-206,Pb-207,Pb-208, Bi-209, Th-232 and U-238 were calculated both theoretically and semi-empirically. Theoretical calculations were done using two different computer codes: PCROSS computer code for the full exciton model and ALICE/ASH-2006 computer code for the geometry dependent hybrid (GDH) model with the incident neutron energy up to 25 MeV. Semi-empirical calculations were done using formulas derived by several researchers. The obtained results have been discussed and compared with the available experimental data taken from the literature. The different nuclear reaction program codes used in the present study show considerable differences depending upon the selected energy range. Especially PCROSS calculation results show a disagreement above the incident energy of about 16 MeV for all the studied nuclei. Moreover, even though the graphs qualitatively agree in shape, they differ in magnitude below 15 MeV.
Deuteron-Induced Cross Section Calculations of Some Structural Fusion Materials
(Springer, 2013) Kaplan, Abdullah; Özdoğan, Hasan; Aydın, Abdullah; Tel, Eyüp
The development of fusion materials for the safety of fusion power systems and understanding nuclear properties is important. The reaction cross-section data have a critical importance on fusion reactors and development for fusion reactor technology. In this study, the theoretical cross sections of some structural fusion materials such as Cr, V, Fe, Ni, Zr and Ta in deuteron-induced reactions have been investigated. The new calculations on the excitation functions of Cr-50(d, alpha)V-48, V-51(d, 2n)Cr-51, V-51(d, 4n)Cr-49, Fe-54(d, alpha)Mn-52, Fe-54(d, n)Co-55, Ni-58(d, alpha)Co-56, Zr-96(d, n)Nb-97, Zr-96(d, 2n)Nb-96 and Ta-181(d, 2n)W-181 reactions have been carried out up to 90 MeV incident deuteron energies. In these calculations, the pre-equilibrium and equilibrium effects have been investigated. The pre-equilibrium calculations involve the geometry dependent hybrid model and hybrid model. Equilibrium effects have been calculated according to the Weisskopf-Ewing model. The ALICE/ASH computer code has been used in all calculations. The calculated results have been compared with the experimental data existing in EXFOR database and found to be in good agreement.
Double Differential Charged Particle Emission Cross Sections and Stopping Power Calculations for Structural Fusion Materials 58,60Ni
(Springer, 2015) Sarpün, İsmail Hakkı; Aydin, Abdulah; Kaplan, Abdullah; Demir, Bayram; Tel, Eyüp; Çapalı, Veli
In this study, double differential light charged particle emission cross section, which is a fundamental data to determine nuclear heating and material damages in structural fusion material research, for Ni-58,Ni-60 target nuclei have been calculated by the TALYS 1.6 code at 14.8 MeV neutron incident energy and compared with available experimental data in EXFOR library. While the compound nucleus formation process contribution was found as dominant in the emission of proton and alpha particles, pre-equilibrium contribution was existed in the deuteron emission and the direct reaction contribution also was seen as dominant in higher particle emission energies. Penetrating distance and stopping powers also have been calculated for the alphas, deuterons and protons in Ni-58,Ni-60 using GEANT4 code and compared with previous works of Cr-50,Cr-52 and Ti-46,Ti-48.
Equilibrium and pre-equilibrium calculations of neutron production in medium-heavy targets irradiated by protons up to 100 MeV
(Pergamon-Elsevier Science Ltd, 2008) Aydin, Emine Gamze; Tel, Eyyüp; Kaplan, Abdullah; Aydın, Abdullah
In this study, by using equilibrium and pre-equilibrium reaction mechanisms, the (p,xn) cross-sections of the spallation neutron target nuclei Cr-50,Cr-52,Cr-53,Cr-54 and Cu-63,Cu-65 were investigated for incident proton energies up to 100 MeV. The excitation functions for pre-equilibrium reaction mechanisms were calculated by using a hybrid model, a geometry dependent hybrid model, the full exciton model and the cascade exciton model. Equilibrium effects were calculated according to the Weisskopf-Ewing model. The calculation results were also compared with the measurements in literature. (c) 2008 Elsevier Ltd. All rights reserved.
Equilibrium and pre-equilibrium emissions in proton-induced reactions on Tl-203,Tl-205
(Indian Acad Sciences, 2009) Kaplan, Abdullah; Aydin, Abdullah; Tel, Eyüp; Sarer, Başar
In this study, the excitation functions for the reactions Tl-203(p, n)Pb-203, Tl-205(p, 3n)Pb-203, Tl-203(p, 2n)Pb-202, Tl-205(p, 4n)Pb-202, Tl-203(p, 3n)Pb-201, Tl-205(p, 5n)Pb-201, Tl-203(p, 4n)Pb-200 and Tl-205(p, 6n)Pb-200 have been calculated using pre-equilibrium and equilibrium reaction mechanisms. Calculated results based on hybrid model, geometry-dependent hybrid model and cascade-exciton model have been compared with the experimental data.
The Equilibrium and Pre-equilibrium Triton Emission Spectra of Some Target Nuclei for (n,xt) Reactions up to 45 MeV Energy
(Springer, 2010) Tel, Eyüp; Kaplan, Abdullah; Aydin, Abdullah; Özkorucuklu, Suat; Büyükuslu, Halim; Yıldırım, Gürcan
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 (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.
The equilibrium and preequilibrium neutron-emission spectra of some structural fusion materials for (n, xn) reactions up to 16 MeV energy
(Maik Nauka/Interperiodica/Springer, 2009) Kaplan, Abdullah; Tel, Eyyüp; Aydin, Abdullah
In this study, neutron-emission spectra produced by (n, xn) reactions for some structural fusion materials as (27)Al, (51)V, (52)Cr, (55)Mn, and (56)Fe have been investigated by a neutron beam up to 16 MeV. Multiple preequilibrium mean-free-path constant from internal transition and the preequilibrium and equilibrium level-density parameters have been investigated for some (n, xn) neutron-emission spectra calculated in this study. Preequilibrium neutron-emission spectra were calculated by using new-evaluated hybrid model and geometry-dependent hybrid model, full-exciton model, and cascade-exciton model. The reaction equilibrium component was calculated by Weisskopf-Ewing model. The obtained results have been discussed and compared with the available experimental data and found agreement with each other.
Investigation of coulomb and pairing effects using new developed empirical formulas for proton-induced reaction cross sections
(Maik Nauka/Interperiodica/Springer, 2010) Tel, Eyyüp; Aydın, E. Gamze; Aydın, Abdullah; Kaplan, Abdullah; Bölükdemir, Mustafa Hicabi; Okuducu, Şeref
We have investigated Coulomb and pairing effects by using new empirical formulas including the new coefficients for (p, alpha) at 17.9 MeV, (p, np) at 22.3 MeV, and (p, n alpha) at 24.8 and 28.5 MeV energies. A new formula is obtained by adjusting Levkovskii's original asymmetry parameter formula and also Tel et al. formula for proton-induced reactions. The new coefficients by using least-squares fitting method for the reactions are determined. In addition, the findings of the present study are compared with the available experimental data.
Investigation of Deuteron Emission Spectra at 62 MeV Proton Incident Energy
(Springer, 2010) Aydin, Abdullah; Türeci, Gökhan; Tel, Eyüp; Kaplan, Abdullah
In this study, deuteron emission cross sections for (27)Al, (54,56)Fe, (89)Y, (120)Sn, (197)Au, (208)Pb and (209)Bi target nuclei have been calculated at 62 MeV proton incident energy. In these calculations, the pre-equilibrium and equilibrium effects have been investigated. The pre-equilibrium calculations involve the geometry dependent hybrid model and hybrid model. Equilibrium effects are calculated according to the Weisskopf-Ewing model. The calculated results are compared with the experimental data taken from the literature and found to be in good agreement.
Investigation of excitation functions using new evaluated empirical and semi-empirical systematic for 14-15 MEV (n,t) reaction cross sections
(2007) Tel, Eyyüp; Aydın, Abdullah; Aydin, Emine G.; Kaplan, Abdullah
The hybrid reactor is a combination of the fusion and fission processes. In the fusion-fission hybrid reactor, 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. Working out the systematics of (n,t) reaction cross sections is of great importance for the definition of the excitation function character for the given reaction taking place on various nuclei at energies up to 20 MeV. In this study, we have investigated the asymmetry term effect for the (n,t) reaction cross sections at 14-15 neutron incident energy. It has been discussed the odd-even effect and the pairing effect considering binding energy systematic of the nuclear shell model for the new experimental data and new cross section formulas (n,t) reactions developed by Tel et al. We have determined a different parameter groups by the classification of nuclei into even-even, even-odd and odd-even for (n,t) reactions cross sections. The obtained empirical formulas by fitting two parameter for (n,t) reactions were given. All calculated results have been compared with the experimental data. By using the new cross sections formulas (n,t) reactions the obtained results have been discussed and compared with the available experimental data.
Investigation of ground state features of some medical radionuclides
(Carl Hanser Verlag, 2012) Tel, Eyüp; Aydın, Abdullah; Kara, Ayhan; Kaplan, Abdullah
In this study, ground state properties for some medical radionuclides used widely in medical applications have been investigated using Skyrme-Hartree-Fock (SHF) method. We calculated the proton, neutron and charge density RMS (root-mean-square) radii of some medical radionuclides such, as K-42 Ca-45, K-81, Rb-81, Rb-82, Sr-85, In-110, In-111, Cs-123, Tl-201 and (201)pb using the SHF calculations with the Skyrme force parameters. The calculated results are compared with the available experimental values for charge density RMS radii. The proton, neutron, charge and mass density distributions for all nuclei used in this study have also been calculated. The calculated conclusions can he used 'in estimating nuclear properties of the medical nuclei and for the calculations of pre-equilibrium reactions cross section data for the production of new medical radioisotopes.
Investigation of Nucleon Mean Free Path Dependence in Tritium Emission Spectra Produced by Proton Induced Reactions at 62 MeV
(Springer, 2010) Yalim, Hueseyin Ali; Aydin, Abdullah; Sarpun, Ismail Hakki; Unal, Ridvan; Oruncak, Bekir; Kaplan, Abdullah; Tel, Eyyup
This study aims on the effect of nucleon mean free path on differential cross sections of tritium-emission spectra for (p, H-3) reactions on Al-27, Fe-54,Fe- 56, Y-89, Sn-120, Au-197, Pb-208 and Bi-209 induced by 62 MeV protons in the pre-equilibrium reaction mechanisms. The pre-equilibrium calculations were carried out by using the geometry dependent hybrid model. The calculated results are compared with experimental data existing in literature and found to be in good agreement. Furthermore, using different multiplication factor for the mean free path in the calculation changes the differential cross sections of tritium emission spectra.
Investigation of the properties of the nuclei used on the new generation reactor technology systems (Conference Paper)
(2007) Tel, Eyyüp; Şahin, Hacı Mehmet; Yalçin Ş.; Altinok T.; Kaplan, Abdullah; Aydın, Abdullah
The application fields of the fast neutron are Accelerator-Driven subcritical Systems (ADS) for fission energy production and hybrid reactor systems. The technical design hybrid reactor and ADS systems potentialities require the knowledge of a wide range of better data and much effort. Thorium (Th) and Uranium (U) are nuclear fuels in these reactor systems. Lead (Pb), Bismuth (Bi) and Tungsten (IT) are the target nuclei in the ADS reactor systems. The Hartree-Fock (H-F) method with an effective interaction with Skyrme forces is widely used for studying the properties of nuclei such as binding energy, Root Mean Square (RMS) charge radii, mass radii, neutron density, proton density, electromagnetic multipole moments, etc. In this study, by using H-F method with interaction Skyrme RMS charge radii, RMS mass radii, neutron density and proton density were calculated for the 232Th, 238U, 207Pb, 209Bi and 184W isotopes used on the new generation reactor systems. The calculation results of charge radii have been compared with experimental data and obtained other results have been discussed for hybrid and ADS reactor systems.
Neutron Emission Spectra of Some Structural Fusion Materials at 26.8 and 45.2 MeV Alpha Incident Energies
(Springer, 2010) Kaplan, Abdullah; Aydin, Abdullah; Tel, Eyüp; Büyükuslu, Halim
In 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.
New calculations of cyclotron production cross sections of some positron emitting radioisotopes in proton induced reactions
(Indian Assoc Cultivation Science, 2009) Tel, Eyüp; Aydın, Emine Gamze; Kaplan, Abdullah; Aydın, Abdullah
In this study, new calculations on the excitation functions of C-13(p,n)N-13, N-14(p,alpha)C-11, N-15(p,n)O-15, O-16(p,alpha)N-13, O-18(p,n)F-18, Ni-62(p,n)Cu-62, Zn-68(p,n)Ga-68 and Ge-72(p,n)As-72 reactions have been carried out in the 5-40 MeV incident proton energy range. In these calculations, the pre-equilibrium and equilibrium effects have been investigated. The pre-equilibrium calculations involve hybrid model, geometry dependent hybrid model, the cascade exciton model and full exciton model. Equilibrium effects were calculated according to Weisskopf-Ewing model. The calculated results have been compared with experimental data taken from literature.
Newly developed semi-empirical formulas for (p, α) at 17.9 MeV and (p, np) at 22.3 MeV reaction cross-sections
(Indian Acad Sciences, 2010) Tel, Eyyüp; Aydın, Abdullah; Aydın, E. Gamze; Kaplan, Abdullah; Yavaş, Ömer; Reyhancan, İskender A.
In this study, we have investigated the asymmetry term effect for the (p, alpha) and (p, np) reaction cross-sections and obtained new coefficients for the (p, alpha) and (p, np) reaction cross-sections at 17.9 and 22.3 MeV energies. We have suggested semi-empirical formulas including the non-elastic effects of optical model found by fitting two parameters for proton-induced reactions. The coefficients were determined by least-square fitting method. The obtained cross-section formulas with new coefficients have been discussed and compared with the available experimental data.

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