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Öğe Calculation of cross-sections and astrophysical s-factors for the 63 Cu(α,n) and 63 Cu(α,γ) reactions(E D P Sciences, 2015) Yildiz, Ercan; Aydin, Abdullah; Sarpun, Ismail Hakki; Tel, EyyupThe cross sections and astrophysical S-factors of the Cu-63(alpha,gamma) and Cu-63(alpha,n) reactions have been calculated. The radiative alpha capture reaction cross sections was calculated in the incident energy range of 3 to 10 MeV and the (alpha,n) reaction cross sections was calculated in the incident energy range of 7 and 16 MeV. In these theoretical calculations, the TALYS 1.6 and NON-SMOKER codes were used. Also for these reactions, it was calculated the astrophysical S-factors which describe the possibility of reaction in low energies. Obtained results were compared to the experimental data taken from EXFOR database.Öğe Calculations of Cross-Sections and Astrophysical S-factors for the (alpha,n) Reactions of Some Structural Fusion Materials(Springer, 2017) Yildiz, Ercan; Aydin, Abdullah; Sarpun, Ismail Hakki; Tel, EyyupStructural material selection in design of fusion reactors is very crucial. These structural materials should satisfy the hard conditions such as high thermo-mechanical stresses, high heat loads and severe radiation damage without compromising on safety considerations. The materials such as titanium, vanadium and chromium are used in the construction of fusion reactors. Therefore, it is important to examine these materials. Obtained results from the nuclear reactions using structural materials can be used for developing of these structural materials. For this reason, in this study cross sections of the Ti-46(alpha,n) Cr-49, Cr-50(alpha,n) Fe-53 and V-51(alpha,n) Mn-54 reactions have been calculated at 2-20 MeV energy range. In these theoretical calculations, the TALYS 1.8 and NON-SMOKER codes were used. Also, the astrophysical S-factors which describe the possibility of reaction in low energies were calculated. Results of our calculations were checked to the experimental data obtained from EXFOR database.Öğe 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, EyyupIn 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.Öğe Determinations of fission cross-sections and fission yields from proton induced fission reactions of 232Th, 233,235,236,238U, 237Np and 239Pu(World Scientific Publ Co Pte Ltd, 2021) Sarpun, Ismail Hakki; Yalim, Huseyin Ali; Aydin, Abdullah; Tel, Eyyup; Akdeniz, Ferhan; Sahin, SelcanIn this work, the proton induced fission reaction cross-sections and fission yields are calculated for some actinides (Th-232, U-233,U-235,U-236,U-238, Np-237, and Pu-239) using the fission barrier models of the TALYS 1.95 code. Cross-sections and fission yield calculations are carried out up to 100 MeV incident proton energies. The calculation results are compared with the available experimental data in the EXFOR library. In addition, a relative variance analysis of fission barrier models was done to determine the fission barrier model whose results best matched with the experimental results. Among the fission barrier models, the best agreement with the experimental data is obtained from the rotating-finite-range fission barrier model calculation for the (p,f) reaction of the studied nuclei having the atomic mass number larger than 230. On the other hand, fission barrier heights for the studied reactions are determined using the same models.Öğe Double differential cross section calculations of (n,p) reactions on 27Al and 24Mg targets(EDP Sciences, 2024) Sarpün, Ismail Hakki; Tel, Eyyup; Aydin, Abdullah; Yildirir, UnalIn structural fusion material research, double differential sections are necessary to determine heating and damage due to secondary particles that may occur in structural materials. Therefore, in this study, the double differential proton emission cross sections of 27Al and 24Mg target nuclei were calculated theoretically with the TALYS nuclear reaction code at 14 MeV neutron energy. The calculated values were compared with existing experimental data in the EXFOR library. Additionally, the contribution of direct, compound and preequilibrium reactions in theoretical calculations was investigated. © The Authors.Öğe Double differential light charged particle emission cross sections for some structural fusion materials(E D P Sciences, 2017) Sarpun, Ismail Hakki; Aydin, Abdullah; Tel, EyyupIn fusion reactors, neutron induced radioactivity strongly depends on the irradiated material. So, a proper selection of structural materials will have been limited the radioactive inventory in a fusion reactor. First-wall and blanket components have high radioactivity concentration due to being the most flux-exposed structures. The main objective of fusion structural material research is the development and selection of materials for reactor components with good thermo-mechanical and physical properties, coupled with low-activation characteristics. 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 some elements target nuclei have been calculated by the TALYS 1.8 nuclear reaction code at 14-15 MeV neutron incident energy and compared with available experimental data in EXFOR library. Direct, compound and pre-equilibrium reaction contribution have been theoretically calculated and dominant contribution have been determined for each emission of proton, deuteron and alpha particle.Öğe Double Differential Proton Emission Cross Sections for Structural Fusion Materials Mg-24(Amer Inst Physics, 2018) Demirelli, Gozde; Sarpun, Ismail H.; Oruncak, Bekir; Tel, Eyyup; Aydin, AbdullahIn this study, double differential proton emission cross sections of 24Mg target nuclei have been theoretically calculated by the TALYS 1.8 code at 14 MeV neutron incident energy. Theoretical calculated cross sections were compared with available experimental data in EXFOR nuclear data library. Furthermore, in theoretical calculations direct, compound and pre-equilibrium reaction contribution have been investigated. Theoretical and experimental values are in good agreement for all given emission angles.Öğe 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, EyyupThis 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.Öğe Nucleon Densities of Copper Isotopes Calculated by Skyrme and Gogny Models(2021) Akdeniz, Ferhan; Sarpün, İsmail Hakkı; Tel, Eyyup; Aydın, AbdullahThe ground state properties of the nuclei are generally calculated using two different methods, namely Skyrme and Gogny force methods. We have calculated nucleon densities of Copper isotopes by using Hartree-Fock-Skyrme (using Woods-Saxon Potential) (SHF-WS), Hartree-Fock-Skyrme (using Harmonic Oscillator Potential) (SHF-HO), Hartree-FockBogolyubov-Skyrme (HFB-S) and the Hartree-Fock-Bogolyubov-Gogny (HFB-G) methods. In the first two methods, the densities and rms (root mean square) radii for both proton and neutron of copper isotopes were calculated by different Skyrme parameters set. Theoretical calculated charge density was compared with experimental data of Angeli and Marinova to determine the best parameter set for each copper isotope. Then all evaluated nucleon densities via four different methods were compared each other. All methods gave similar results for all copper isotopes.Öğe Pre-equilibrium neutron-emission spectra of U-238 with an effective nucleon-nucleon interactions(Pergamon-Elsevier Science Ltd, 2013) Tel, Eyyup; Ersoy, Erhan; Sahan, Muhittin; Yazar, Harun Resit; Aydin, AbdullahIn this study, the initial exciton numbers for the target nucleus U-238 were calculated through a new method offered by Tel et al. (Ann. Nucl. Energy, 35, 220, 2008). Neutron-emission spectra produced by (n,xn) reactions on U-238 nuclei have been calculated by using Hartree-Fock method with effective nucleon-nucleon Skyrme interactions with SKM* parameters. Pre-equilibrium nuclear reactions have been used to investigate the effect of initial exciton numbers on the nucleon emission spectra. Calculations have been made in the framework of the hybrid, equilibrium and GDH models using ALICE/ASH computer code. The initial exciton numbers calculated with the theoretical neutron and proton densities have been obtained with SKM* for the U-238(n,xn) reaction at 14.0 and 18.0 MeV incident neutron energies. We also compared the geometry-dependent hybrid model (GDH), newly evaluated with the initial exciton number calculations of the neutron emission spectra of the U-238(n,xn) reaction. The obtained results are discussed and compared with the available experimental data and are shown to be in agreement with each other. All calculated results have been compared with experimental data from Experimental Nuclear Reaction Data (EXFOR). (C) 2013 Elsevier Ltd. All rights reserved.Öğe Single Folding Potential Calculations in 141Pr(EDP Sciences, 2024) Akdeniz, Ferhan; Yildirir, Unal; Sarpün, Ismail Hakki; Tel, Eyyup; Aydin, AbdullahIn this study, Skyrme and Gogny forces have been used to describe interactions for Hartree-Fock (HF) and Hartree-Fock-Bogoliubov (HFB) calculations, considering all nucleons to evaluate nucleon densities. The nucleon densities of the 141Pr were calculated by using the Skyrme-HF (SHF) method with Woods-Saxon Potential (SHF-WS) and with Harmonic Oscillator Potential (SHF-HO), HFB method with Skyrme (HFB-S) and with Gogny (HFB-G) interactions. In these calculations, the effects of the three-body force have been accounted for in both Skyrme and Gogny forces through a density-dependent term necessary to describe various properties of nuclei and nuclear matter. The root-mean-square (rms) radii of proton, neutron, and charge densities of the nucleus were calculated using the density-dependent Skyrme-type effective nucleon-nucleon (NN) interaction in the HF approach. The Folding potential, developed to describe nucleon-nucleus (n-Pr) elastic scattering data, was obtained by single folding potential to calculate reaction cross-section calculations for 141Pr target. The calculated cross-sections, obtained using density data from four different models, were compared with each other and with experimental data from the literature for analysis and interpretation of the results. © The Authors.Öğe Study of the pre-equilibrium mean free path constant for light and heavy nuclei for (n, xn) reactions(Pergamon-Elsevier Science Ltd, 2011) Tel, Eyyup; Tatar, Aynur; Aydin, AbdullahUsing pre-equilibrium reaction mechanisms, the neutron-emission spectra produced by (n, xn) reactions for some target (A = 16 similar to 238) nuclei have been calculated for incident neutron energy in the range of 15-26 MeV. From light nuclei to heavy nuclei, the multiple pre-equilibrium mean free path constants from internal transition have been investigated. The obtained results are discussed and compared with the available experimental data. (C) 2011 Published by Elsevier Ltd.Öğe A study on nuclear properties of Zr, Nb, and Ta nuclei used as structural material in fusion reactor(E D P Sciences, 2015) Sahan, Halide; Tel, Eyyup; Sahan, Muhittin; Aydin, Abdullah; Sarpun, Ismail Hakki; Kara, Ayhan; Doner, MesutFusion has a practically limitless fuel supply and is attractive as an energy source. The main goal of fusion research is to construct and operate an energy generating system. Fusion researches also contains fusion structural materials used fusion reactors. Material issues are very important for development of fusion reactors. Therefore, a wide range of fusion structural materials have been considered for fusion energy applications. Zirconium (Zr), Niobium (Nb) and Tantalum (Ta) containing alloys are important structural materials for fusion reactors and many other fields. Naturally Zr includes the Zr-90 (%51.5), Zr-91 (%11.2), Zr-92 (%17.1), Zr-94 (%17.4), Zr-96 (%2.80) isotopes and Nb-93 and Ta-181 include the Nb-93 (%100) and Ta-181 (%99.98), respectively. In this study, the charge, mass, proton and neutron densities and the root-mean-square (rms) charge radii, rms nuclear mass radii, rms nuclear proton, and neutron radii have been calculated for Zr87-102, Nb-93,Ta-181 target nuclei isotopes by using the Hartree-Fock method with an effective Skyrme force with SKM*. The calculated results have been compared with those of the compiled experimental taken from Atomic Data and Nuclear Data Tables and theoretical values of other studies.
