Investigation of the (n, p) reaction cross-sections of some nuclei in the rare-earth elements for an incident energy range of 8-24 MeV

WOS: 000245671800012In this study, the (n, p) reaction cross-sections of some target nuclei in the rare-earth elements have been investigated for an incident energy range of 8 - 24 MeV. In these calculations, the geometry-dependent hybrid model and the cascade exciton model including the effects of pre-equilibrium have been used. The full exciton model has also been used to investigate the pre-equilibrium direct effects. All calculated results have been compared with experimental data. In addition, the ratios of experimental ( n, p) cross-sections to calculated cross-sections using empirical and semi-empirical formulae have been calculated

New calculation of excitation functions of proton-induced reactions in some medical isotopes of Cu, Zn and Ga

WOS: 000244021000015PubMed: 17142050The 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

Investigation of 14-15 MeV (n, t) reaction cross-sections by using new evaluated empirical and semi-empirical systematic formulas

WOS: 000257123500007In 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

Equilibrium and pre-equilibrium emissions in proton-induced reactions on Tl-203,Tl-205

WOS: 000264184100005In 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.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, M Blann for supporting ALICE/ASH- code

New calculation method for initial exciton numbers on nucleon induced pre-equilibrium reactions

WOS: 000256885600036In 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

Calculations of neutron-induced production cross-sections of W-180,W-182,W-183,W-184,W-186 up to 20 MeV

WOS: 000265337600001Neutron-induced cross-sections for the stable isotopes W-180,W-182,W-183,W-184,W-186 in the energy region up to 20 MeV have been calculated. Calculations were made with the codes CEM03.01 and ALICE/ASH, using the following models: the Dubna version of the intranuclear cascade model for the cascade stage of interaction; the hybrid, the geometry dependent hybrid and the exciton model for the pre-equilibrium component; the Hauser-Feshbach and the Weisskopf-Ewing statistical models for the equilibrium component. Effects of some important model parameters such as level density parameter and pairing correction were investigated. Calculated cross-sections were compared with available experimental data in the literature and with ENDF/B-VI T = 300 K and JENDL-3.3 T = 300 K evaluated data libraries. (C) 2008 Elsevier Ltd. All rights reserved.ALICE/ASH codeThe authors wish to thank C. H. M. Broeders et al. for their support of the ALICE/ASH code

A new comparison of empirical and semi-empirical formulae for the (n, He-3) reaction cross-sections at 14-15 MeV

WOS: 000259671800013New 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.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

A new empirical formula for 14-15 MeV neutron-induced (n, p) reaction cross sections

WOS: 000185628700011In 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

The study of the (n,2n) reaction cross-sections for neighbor deformed nuclei in the region of rare-earth elements

WOS: 000220785900011The (n,2n) reaction cross-section calculations for some neighbor deformed target nuclei have been made in the region of rare-earth elements between 8 and 24 MeV incident energy. In the calculations, the geometry dependent hybrid model and the exciton model have been used including the effects of pre-equilibrium. Pre-equilibrium direct effects have been examined using full exciton model. The measured cross-sections are taken from literatures. The cross-sections were calculated using other semi-empirical formulas for the incoming energieswhich satisfy the condition U-R = E-n + Q(n,2n) = 6 +/- 1 MeV. The obtained results were discussed and compared with the available experimental data, and found to be well in agreement