I. H. Sarpün

Calculations of double-differential triton emission cross sections at 62-MeV proton-induced reactions

Double-differential cross sections (d2σ/dΩdɛ) have been calculated and analyzed for triton production in proton-induced reactions on 27Al, 54,56Fe, 197Au, and 208Pb target nuclei at incident energy of 62 MeV. Calculations of double-differential cross sections have been performed using nuclear models implemented in the TALYS 1.2 code. The calculated results of the double-differential cross sections for triton emission have been compared with the existing experimental data.

(γ, 2n)-Reaction cross-section calculations of several even-even lanthanide nuclei using different level density models

There are several level density models that can be used to predict photo-neutron cross sections. Some of them are Constant Temperature + Fermi Gas Model (CTFGM), Back-Shifted Fermi Gas Model (BSFM), Generalized Superfluid Model (GSM), Hartree-Fock-Bogoliubov microscopic Model (HFBM). In this study, the theoretical photo-neutron cross sections produced by (γ, 2n) reactions for several eveneven lanthanide nuclei such as 140,142Ce, 142,144,146,148,150Nd, 144,148,150,152,154Sm, and 160Gd have been calculated on the different level density models as mentioned above by using TALYS 1.6 and EMPIRE 3.1 computer codes for incident photon energies up to 30 MeV. The obtained results have been compared with each other and available experimental data existing in the EXFOR database. Generally, at least one level density model cross-section calculations are in agreement with the experimental results for all reactions except 144Sm(γ, 2n)142Sm along the incident photon energy, TALYS 1.6 BSFM option for the level density model cross-section calculations can be chosen if the experimental data are not available or are improbable to be produced due to the experimental difficulty.

The Effect of the Deformation Parameter on the Cross Sections for Reactions: 110 Pd( d , n ) 111 Ag and 110 Pd( d , 2 n ) 110 m Ag

In this study, we focused on the effects of the deformation parameter on the cross sections. First, the deformation parameters of target nucleus 110Pd was determined within the interacting boson model (IBM). Later this parameter was used in the TALYS-1.8 code to calculate the cross sections of the 110Pd(d,n)111Ag and 110Pd(d, 2n)110mAg reactions. Moreover, other deformation parameters obtained RIPL-3 and TALYS default were used for the cross section calculation. The calculated results were compared with the experimental nuclear reaction data from EXFOR.

Production cross–section calculations of medical 32P, 117Sn, 153Sm and 186,188Re radionuclides used in bone pain palliation treatment

Abstract In this study, production cross–section calculations of 32P, 117Sn, 153Sm and 186,188Re radionuclides used in bone pain palliation treatment produced by 30Si(d,γ)32P, 118Sn(γ,n)117Sn, 116Sn(n,γ)117Sn, 150Nd(α,n)153Sm, 154Sm(n,2n)153Sm, 152Sm(n,γ)153Sm, 186W(d,2n)186Re, 187Re(γ,n)186Re, 185Re(n,γ)186Re and 187Re(n,γ)188Re reactions have been investigated in the different incident energy range of 0.003–34 MeV. Two-component exciton and generalised superfluid models of the TALYS 1.6 and exciton and generalised superfluid models of the EMPIRE 3.1 computer codes have been used to pre-equilibrium (PEQ) reaction calculations. The calculated production cross–section results have been compared with available experimental results existing in the experimental nuclear reaction database (EXFOR). Except the 118Sn(γ,n)117Sn, 150Nd(α,n)153Sm and 185Re(n,γ)186Re reactions, the two-component exciton model calculations of TALYS 1.6 code exhibit generally good agreement with the experimental measurements for all reactions used in this present study.

Comparison of level density models in (γ, n) reactions of some lanthanide nuclei

Level densities are required at excitation energies where discrete level information is not available or incomplete to get a reliable theoretical analysis of cross sections, spectra, and angular distributions. The total reaction cross sections of some lanthanides (141Pr, 142Nd, 144Sm, 153Eu, 160Gd, 159Tb, 165Ho, 175Lu) were calculated using TALYS 1.2 code for gamma-induced reactions through the five level density models in the incident gamma energy range from 5 to 30 MeV. All calculations from the present study were compared with each other and with the experimental data obtained from EXFOR library. The total photo-neutron reaction cross-section values obtained from the model calculations and experimental measurements taken from EXFOR confirm the presence of systematical disagreements reported in the literature, except 165Ho case where one can see a satisfactory agreement.

Relative Effects of Porosity and Grain Size on Ultrasonic Wave Propagation in Marbles

Grain size determinations by various ultrasonic techniques have been considered by several researches. Among the known methods, the ultrasonic seems to stand out because the method could be used to determine many properties of the materials. In this paper, we investigated that relative effect of porosity, mean grain size on ultrasonic velocity in marbles. We have represented ultrasonic velocity–porosity and porosity-grain size master graph. Using this graph, we have compared mean grain size of marble samples by optic microscope images. The experimental data are compared with the velocity versus porosity curves calculated according to ultrasonic methods. We see that ultrasonic velocity and porosity has showed a linear relation with the mean grain size of samples.

Mean grain size evaluation of tungsten- and boron-carbide composites sintered at various temperatures by ultrasonic methods

In this study, the mean grain size of different ceramic-metal composites made from tungsten carbide and boron carbide have been determined with the ultrasonic velocity technique. In addition, the electroless coating method was used to coat the tungsten carbide samples. The prepared samples were sintered at different temperatures ranging from 1200°C to 1400°C in an argon atmosphere. Powders were placed in a 30 mm diameter mold and pressed using a hydraulic press at a pressure of 200 bar. The results were compared to the mean grain size obtained from Scanning Electron Microscopy (SEM). This study shows a clear dependence of ultrasonic velocity on grain size in composites of boron carbide and tungsten carbide. Especially the temperature dependence of mean grain size for tungsten carbide composites can be seen very clearly.