East European Journal of Physics

4-14

Authors: M.Y. El-Bakry, E.A. El-Dahshan, A. Radi, M. Tantawy, M.A. Moussa

Multiparticle production mechanism is one of the most phenomena that the high-energy physics concerns. In this work, the evolutionary genetic algorithm (GA) is used to optimize the parameters of the back-propagation neural networks (BPNN). The hybrid evolutionary-neuro model (GA-BPNN) was trained to simulate the rapidity distribution (1/N *(dN/dY) of positive and negative pions for p − Au, p − Ag and p −Mg interactions at lab momentum Lab (P ) =100 GeV/c. Also, for total charged, positive and negative pions for p − Ar, p − Xe interactions at Lab P = 200 GeV/c. Finally, total charged particles for p − Pb collision at center-of-mass energy ( s ) = 5.02 TeV are simulated. An efficient ANN network with different connection parameters (weights and biases) have been designed by the GA to calculate and predict the rapidity distribution as a function of the lab momentum Lab (P ) , mass number (A) and the number of particles per unit solid angle (Y). Our simulated results have been compared with the experimental data and the matching has been clearly found. It is indicated that the developed GA-BPNN model for rapidity distribution was more successful.

26-31

Authors: S.I. Derevianko, A.K. Kuzniak, Ju.A. Liashenko, I.O. Shmatko, O.A. Shmatko

The mathematical analysis of influence of additives of the third component (Cr, Mn, Fe, Co, Ni, Ga, Zr, In, Sn) on quantities of energies of a segregation of impurities in volume and on boundaries of grains of alloy Cu-4,35 at. % Ti is made during aging on the cellular mechanism. Calculation of enthalpies of a segregation is spent with the account of energies of interatomic and elastic interaction of atoms of a different grade. Effects of experimental researches testify, in particular, to effective accelerating influence Ni on development of cellular decay in alloy Cu-4,35 ат. % Ti and essential inhibiting action of the given process by an additive Co. On the basis of modelling calculations of enthalpies of mixture in volume and on boundaries of grains it is erected that for the specified additives distinctions in quantities of an enthalpy of mixture in volume of grains appear considerable. The carried out analysis can be taken as a principle build-ups of model of a dynamic segregation and its influence on velocity of cellular decay in threefold metal systems.

41-48

Authors: D.V. Kutnii, A.V. Medvediev, S.A. Vanzha

The work presents the results of method development for matrix effects correction in X-ray fluorescence measurements of Ti, Mn, Fe and U concentrations in the silicate-type uranium ore samples using wavelength dispersive XRF spectrometer S 8 Tiger (Bruker AXS GmbH, Germany). Comparison of the results obtained using standard software package Spectra Plus of the spectrometer and normalized to intensity of characteristic line of primary radiation, incoherently scattered by sample, was carried out. It is shown that for the investigated elements during X-ray fluorescent measurements of their concentrations, in addition to intensity normalization, it is necessary to use additional analytical correction. The use of this method to calculate the corrected concentrations of TiO2, MnO, Fe2O3 and U3O8 allows to decrease the relative error of measurements up to < 5 % within the range of concentrations 0.1…4 mas. % and up to ≤ 7.5 % within the range of concentrations 0.04…0.06 mas. %.

54-60

Authors: D.G. Malykhin

Results of a precise calculation of X-ray diffraction on distorted edge-dislocation neighborhood in crystals are represented. Calculation of lattice sums of diffraction has been carried out with adherence to the classical scheme. So unlike to the previous approach, finite-differential distances of atomic pairs of diffraction were immediately taken into account here. The statistical form of their representation was used. Obtained results are compared with previous those based on identification of X-ray profiles with statistical strain distribution. It was found that accuracy of the previous result is sufficient for analyses of the dislocation structure with moderate inhomogeneity.

65-69

Authors: I.I. Yakimenko, N.G. Styervoyedov, A.F. Shchus, G.M. Onyshchenko

The paper shows the possibility of determining of the radon by the radiometer on a base of multi-channel time analyzer of beta – decay products of radon. The radiometer consist of an electrostatic aerosol collector combined with the air intake, Geiger-Muller counter for detection of beta particles and multi-channel time analyzer. Accumulation time of aerosol sample takes up to 20 min, the time data processing is done by the radiometer about 5 hours. The data processing is at off-line mode using the computer decomposition process of decay spectrum.