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Öğe Calculation of Equilibrium and Pre-equilibrium He-4-Emission Spectra at 62 MeV Proton Incident Energy(Springer, 2011) Aydin, A.; Tel, E.; Sahan, M.In this study, the He-4-emission cross sections for Al-27, Fe-54,Fe-56, Au-197, Pb-208 and Bi-209 target nuclei have been calculated at 62 MeV proton energy. In these calculations, the pre-equilibrium effects have been investigated. The pre-equilibrium calculations involve the geometry dependent hybrid model and hybrid model. A comparison with theoretical calculations (ALICE/ASH) has been performed and the empirical formulas for the He-4-emission cross sections produced at 62 MeV proton energy have been derived.Öğe Calculations of Double-Differential Neutron Emission Cross Sections for Be-9 Target Nucleus at 14.2 MeV Neutron Energy(Springer, 2015) Sahan, M.; Tel, E.; Sahan, H.; Kara, A.; Aydin, A.; Kaplan, A.; Yildiz, E.In this study, we investigated neutron-emission spectra induced by (n,xn) nuclear reactions for the Be-9 structural fusion material at 14.2 MeV neutron energy. We calculated double-differential cross sections () with ALICE-2011 codeor the angles of 30A degrees, 60A degrees, 90A degrees, 120A degrees, and 150A degrees. Hybrid Monte Carlo simulation model have been used to calculate the double differential emission spectra for these different angles. The obtained results were compared with the measured data taken from EXFOR library. The results show an acceptable agreement.Öğe Excitation Functions Calculations of the Charged Particle-Induced Nuclear Reactions on the Be-9 Target(Springer, 2017) Tel, E.; Gok, A. A.; Sahan, M.; Sarpun, I. H.; Kavun, Y.; Aydin, A.In this study, calculation of charged particles induced nuclear reactions of beryllium (Be-9) target nuclei have been investigated in the incident proton and alpha at energy range from threshold to 50 MeV. The excitation functions for Be-9 target nuclei reactions have been calculated by using PCROSS nuclear reaction calculation code. Weisskopf-Ewing model for equilibrium, calculations and the full exciton and cascade exciton models for pre-equilibrium calculations were used. Also, the semi-empirical calculations for (p,alpha) reactions have been done by using cross section formula updated with new coefficient developed by Tel et al. (Pramana Indian Acad Sci 74(6):931, 2010). The calculated results were compared with the experimental data for different energy levels ranging from 0.00 to 9.65 MeV taken from the literature.Öğe Investigation of cross sections of reactions used in neutron activation analysis(Carl Hanser Verlag, 2011) Tel, E.; Sahan, M.; Ugur, F. A.; Sahan, H.; Aydin, A.In this study, neutron incident reaction cross sections for some target nuclei such as Mg-24, Al-27, Si-28, Fe-56, and Cu-63 used in neutron activation analysis have been investigated. The new calculations on the excitation functions of Mg-24(n, p)Na-24, Al-27(n, p)Mg-27, Al-27(n, alpha)Na-24, Si-28(n, p)Al-28, Fe-56(n, p)Mn-56, and Cu-63(n,2n)Cu-62 reactions have been carried out for incident neutron energies up to 20 MeV. In these calculations, the pre-equilibrium and equilibrium effects have been investigated. The pre-equilibrium calculations involve the new geometry dependent hybrid model and the full exciton model. Equilibrium effects are calculated according to the Weisskopf-Ewing model. In the present work, reaction cross-sections have been calculated by using empirical formulas developed for energies of 14-15 MeV. The calculated results are discussed and compared with the experimental data taken from the EXFOR database.Öğe Investigation of Some Stellar Iron Group Fusion Materials for (n, p) Reactions(Springer, 2012) Sahan, M.; Tel, E.; Aydin, A.; Yegingil, IlhamiIn this study, we present the results of a careful analysis of cross sections of some important iron (Fe) group target elements (20 a parts per thousand currency sign Za parts per thousand currency sign28) for astrophysical (n, p) reactions such as Si, Ca, Sc, Ti, V, Cr, Fe, Co and Ni used in neutron activation analysis have been investigated. The new calculations on the excitation functions of (28) Si(n, p) (28) Al, (29) Si(n, p) (29) Al, (42) Ca(n, p) (42) K, (45) Sc(n, p) (45) Ca, (46) Ti(n, p) (46) Sc, (51) V(n, p) (51) Ti, (52) Cr(n, p) (52) V, (53) Cr(n, p) (53) V, (54) Fe(n, p) (54) Mn, (57) Fe(n, p) (57) Mn, (59) Co(n, p) (59) Fe, (58) Ni(n, p) (58) Co and (60) Ni(n, p) (60) Co reactions have been carried out up to 25 MeV incident neutron energy. In these calculations, the pre-equilibrium and equilibrium effects have been investigated. Equilibrium effects are calculated according to the Weisskopf-Ewing model. The pre-equilibrium calculations involve the geometry dependent hybrid model, hybrid model and equilibrium model. Also in the present work, these reaction cross-sections have been calculated by using evaluated empirical formulas developed by Tel et al. at 14.7 MeV energy. The calculations are compared with existing experimental data as well as with evaluated data files (Experimental Nuclear Reaction Data (EXFOR). According to these calculations, we assume that these model calculations can be applied to some heavy elements, ejected into interstellar medium by dramatic supernova events.Öğe Investigation of Some Structural Fusion Materials for (n, alpha) Reactions at the 14-15 MeV Energy Region(Springer, 2011) Tel, E.; Sahan, M.; Aydin, A.; Bolukdemir, M.; Sahan, H.; Ugur, F. A.In fusion reactor structures, a serious damage mechanism has been gas production in the metallic resulting from diverse nuclear reactions, mainly through (n, alpha) and (n, p) reactions above a certain threshold energy. The neutron incident energy around 14-15 MeV is enough to excite the nucleus for the reactions such as (n, p), (n, d), (n, 2n), (n, t), and (n, alpha). Design of the fusion reactor, about the 14-15 MeV neutron incident energy reaction cross sections is of great importance for various target nuclei. In this study, the experimental data have been taken only at 14-15 MeV energy regions from EXFOR database. The (n, alpha) reactions for some structural fusion materials such as Al-27, V-51, Cr-52, Mn-55, Fe-56 and Ni-58 have calculated by using evaluated empirical formulas developed by Tel et al. at 14-15 MeV and calculated with the pre-equilibrium models up to 20 MeV. The calculated results are discussed and compared with the experimental data taken from EXFOR database.Öğe Pre-equilibrium Emission Spectra Calculations of Th-232(n,xn) Using New Evaluated Method(Springer, 2011) Tel, E.; Efil, A.; Uluer, I.; Aydin, A.; Sahan, M.The knowledge of the thorium (Th-232) cycle potentialities are required for the design of a fusion-fission (hybrid) reactor. Pre-equilibrium nuclear reactions have been used to investigate the effect of initial exciton numbers on the nucleon emission spectra. In this study, the initial exciton numbers for the target nucleus of Th-232 were calculated through a method of offered by Tel et al. and then were used to obtain the effect cross section of the neutron emission spectra. Using this new method, a different way from the literature, the initial exciton numbers calculated with the theoretical neutron and proton densities have been obtained with SKM* on the Th-232(n,xn) reaction at 14.1 and 18.0 MeV incident neutron energies. The results were analyzed by comparing the empirical results in the literature.Öğe The Study of (n,d) Reaction Cross Sections for Some Medium Weight Targets up to 30 MeV(Springer, 2011) Aydin, A.; Sahan, M.; Tel, E.; Sahan, H.; Ugur, F. A.In this study, neutron incident reaction cross sections for some medium target nuclei ( (44) Ca, (65) Cu, (54) Fe, (56) Fe, (57) Fe, (58) Ni, (60) Ni and (67) Zn) have been investigated for the (n,d) reaction cross sections. These new calculations on the excitation functions of (44) Ca(n,d) (43) K, (65) Cu(n,d) (44) Ni, (54) Fe(n,d) (53) Mn, (56) Fe(n,d) (55) Mn, (57) Fe(n,d) (56) Mn, (58) Ni(n,d) (57) Co, (60) Ni(n,d) (59) Co and (67) Zn(n,d) (66) Cu reactions have been carried out up to 30 MeV incident neutron energy. In these calculations, the pre-equilibrium and equilibrium effects have been investigated. The PEQ calculations involve the new evaluated the Geometry Dependent Hybrid model. Equilibrium effects are calculated according to the Weisskopf-Ewing model. By using the new cross sections formulae for (n,d) reactions developed by Aydin et al., the obtained results have been discussed and compared with the available experimental data taken from EXFOR database.Öğe A Study on Be8-18 Isotopes Used on Neutron Multiplier in Reactor Design(Springer, 2011) Tel, E.; Akti, N. N.; Okuducu, S.; Aydin, A.; Sahan, M.; Ugur, F. A.; Sahan, H.Neutronic characterization and development of structural materials, neutron multiplier materials, tritium breeders are primarily important for fusion and hybrid reactors. In order to improve neutron economy, beryllium, lead, bismuth, zirconium are considered and used as neutron multiplier materials in fusion and hybrid reactor design. In this study, rms charge radii, neutron radii, mass radii and neutron skin thickness were calculated for Be8-18 isotopes nuclei. The neutron and proton density are calculated for Be isotopes. The results obtained were compared with the experimental and theoretical results of other researchers by using Hartree-Fock method with an effective interaction with Skyrme forces.Öğe A Study on the New Empirical Cross Section Formulae for (gamma, p) Reactions at 20 +/- 1 MeV Incident Energy(Springer, 2018) Tel, E.; Kavun, Y.; Sahan, M.; Aydin, A.In this study, we have investigated theoretical cross sections of (gamma, p) reactions at 20 +/- 1 MeV for the photon incident energy and then we have obtained two new empirical formulae for 40 <= A <= 108 and for the even Z-even N target nuclei including new fitting parameters. These new empirical formulae depending on the asymmetry parameters (s = (N - Z)/A) were determined by using the least squares approximation fitting method to the available experimental cross section data taken from EXFOR. The results have been compared with the experimental data and found to be well in agreement.
