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Monte Carlo study of medium-energy electron penetration in aluminium and silver

Aydın A., Peker A.

Nukleonika

2015

Vol. 60, No. 2

361--366

Monte Carlo simulations are very useful for many physical processes. The transport of particles was simulated by Monte Carlo calculating the basic parameters such as probabilities of transmitted–reflected and angular-energy distributions after interaction with matter. Monte Carlo simulations of electron scattering based on the single scattering model were presented in the medium-energy region for aluminium and silver matters. Two basic equations are required the elastic scattering cross section and the energy loss. The Rutherford equation for the different screening parameters is investigated. This scattering model is accurate in the energy range from a few keV up to about 0.50 MeV. The reliability of the simulation method is analysed by comparing experimental data from transmission measurements.

Monte Carlo calculations of low energy positrons in silicon

Aydin A.

Nukleonika

2005

Vol. 50, nr 1

37-42

Theoretical data for positron scattering from a thin silicon film and semi-infinite silicon are presented as a function of incident and outgoing angles and energies. These theoretical data of the scattering processes of low energy positrons penetrating into silicon were performed by Monte Carlo simulation. The simulation is based on the use of different types of differential cross sections for individual elastic and inelastic scattering i) inelastic scattering; Gryzinski's excitation function to simulate the energy loss and Liljequist's model to calculate the inelastic scattering cross section, ii) elastic scattering; the screened Rutherford differential cross section with the spin-relativistic factor. In calculations on positron traversing matter, it is important to know the transmission through medium, their path lengths, and their energy and angular distribution through matter. The simulation results are well agreed with experiments.

Badania selektywnego rozpraszania światła przez mieszaniny ciekłokrystaliczne

Klimczyk S., Wilk D., Drzymała A., Chłędowska K., Szwajczak E.

Zeszyty Naukowe Politechniki Rzeszowskiej. Fizyka

1998

z. 7 [164]

57-67

W pracy opisano stanowisko do badania selektywnego rozpraszania światła przez mieszaniny ciekłokrystaliczne. Na podstawie obliczeń wynikających ze wzoru Fergasona przygotowano odpowiednie mieszaniny ciekłokrystaliczne, a następnie wykonano pomiary rozkładu kątowego wiązki monochromatycznej rozproszonej przez te mieszaniny. Wykonano też pomiary mieszanin modyfikowanych parami rozpuszczalników organicznych i zmianami temperatury.

New equipment designed for researches of selective dispersion of liqht, sutffered on liquid crystal mixtures, is described. Liquid crystal mixtures, basing on calculations resulting from Fergason equation, were prepared. Then angular distribution of monochromatic bunch dispersed by mixtures were measured. Measurement for mixtures modified by temperature change and organic solvent vapours were also performed.