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Öğe Calculations of proton-induced neutron production cross sections on Th-232 up to 1.6 GeV(Amer Nuclear Society, 2006) Sarer, B.; Günay, M.; Aydin, A.; Tel, E.; Arasoğlu, A.The Th-232(p, xn) and Th-232(p, np) cross sections for incident proton energies in the range of 10 to 1600 MeV have been calculated by using a cascade-exiton model (CEM) combining essential features of the exciton model and intranuclear cascade models. The level density parameter effects are investigated. The calculation results are compared with the available measured data.Öğe Investigation of 14-15 MeV (n, t) reaction cross-sections by using new evaluated empirical and semi-empirical systematic formulas(Springer, 2008) Tel, E.; Aydin, A.; Kaplan, A.; Sarer, B.In the 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 are 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 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-sections 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 and semi-empirical formulas by fitting two parameter for (n, t) reactions were given. All calculated results have been compared with the experimental data and the other semi-empirical formulas.Öğe Level density parameter dependence of the fission cross sections of some subactinide nuclei induced by protons with the incident energy up to 250 MeV(Pergamon-Elsevier Science Ltd, 2009) Aydin, A.; Yalim, H. A.; Tel, E.; Sarer, B.; Unal, R.; Sarpun, I. H.; Dag, M.This study aims to show the dependence on the choice of the ratio of the level density parameters a(f) and a(n) corresponding to the saddle point of fission and equilibrium deformation of nucleus, respectively, of the proton induced fission cross sections of some subactinide targets. The method was employed using different level density parameter ratios for each fission cross section calculation in ALICE/ASH computer code. The ALICE/ASH code calculations were compared both with the available experimental data and with the Prokofiev systematics data. It is found that the fission cross sections dependent heavily on the choice of level density parameter ratio in the fission and neutron emission channels, a(f)/a(n), for some subactinide nuclei. To get a good description of the measured fission cross sections for subactinide nuclei, we used a ratio of the level density parameters in the fission and neutron emission channels. a(f)/a(n), depending both on the target-nucleus and on the energy of the projectile, in agreement with results published in literature. (C) 2009 Elsevier Ltd. All rights reserved.Öğe New calculation method for initial exciton numbers on nucleon induced pre-equilibrium reactions(Amer Physical Soc, 2008) Tel, E.; Aydin, A.; Kaplan, A.; Sarer, B.In this study, we investigate the pre-equilibrium effect by using new evaluated geometry dependent hybrid model for the 208 Ph (p, xn) reaction at 25.5 and 62.9 MeV incident proton energies. We also suggest that the initial neutron and proton exciton numbers for the nucleon induced precompound reactions be calculated from the neutron and proton density by using an effective nucleon-nucleon interaction with Skyrme force. We calculate the initial exciton numbers obtained from SKM* and SLy4 for a proton induced reaction on target nuclei 208 Ph. The obtained results have been investigated and compared with the pre-equilibrium calculations and experimental results.Öğe New calculation of excitation functions of proton-induced reactions in some medical isotopes of Cu, Zn and Ga(Pergamon-Elsevier Science Ltd, 2007) Aydin, A.; Sarer, B.; Tel, E.The new calculations on the excitation functions of Ni-61(p,n)Cu-61, Ni-62(p,n)Cu-62, Ni-64(p,n)Cu-64, Cu-61(p,2n)Zn-62, Cu-63(p,n)Zn-63, Cu-65(p,n)Zn-65, Zn-66(p,n)Ga-66, Zn-67(p,2n)Ga-66, Zn-67(p,n)Ga-67 and Zn-68(p,n)Ga-68 reactions have been carried out in the 5-30MeV proton energy range. The calculations involve the cascade exciton model, preequilibrium nuclear reaction model and exciton model. The calculated results are compared with the experimental data taken from the literature. (c) 2006 Elsevier Ltd. All rights reserved.Öğe A New Comparison of Empirical and Semi-empirical Formulae for the (n, 3He) Reaction Cross-sections at 14–15 MeV(Springer, 2008) Aydin, A.; Tel, E.; Sarer, B.; Kaplan, A.New empirical and semi-empirical formulae have been suggested for the (n, He-3) reaction cross-sections with dependent on asymmetry parameter, S = (N - Z)/A. The (n, He-3) reaction cross-sections at the energy of 14-15 MeV have been investigated for two different parameters groups by the classification of nuclei into 31 <= A <= 103 and 133 <= A <= 181. The obtained results have been compared with the other systematics and experimental data for the (n, He-3) reaction cross-sections. Some improvement has been got in describing the (n, He-3) reaction cross-sections compared with the existing relations.Öğe A new empirical formula for 14-15 MeV neutron-induced (n, p) reaction cross sections(Iop Publishing Ltd, 2003) Tel, E.; Sarer, B.; Okuducu, S.; Aydin, A.; Tanir, G.In this study, we have suggested a new empirical formula to reproduce the cross sections of the (n, p) reactions at 14-15 MeV for the neutron incident energy. This formula obtained using the asymmetry parameters represents a modification to the original formula of Levkovskii. The resulting modified formulae yielded cross sections, representing smaller chi(2) deviations from experimental values, and values much closer to unity as compared with those calculated using Levkovskii's original formula. The results obtained have been discussed and compared with the existing formulae, and found to be well in agreement, when used to correlate the available experimental sigma(n, p) data of different nuclei.
