Energy distributions of particles transmitted through free foils at oblique incidence
| Autor: | N.N. Trifonov, N.N. Koborov, V. S. Remizovich, A.I. Kuzovlev, V.A. Kurnaev |
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| Rok vydání: | 1997 |
| Předmět: |
Imagination
Physics Nuclear and High Energy Physics Physics::Instrumentation and Detectors media_common.quotation_subject Inelastic collision Function (mathematics) Spectral line Full width at half maximum Path length Atomic physics Instrumentation Energy (signal processing) FOIL method media_common |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 129:5-10 |
| ISSN: | 0168-583X |
| DOI: | 10.1016/s0168-583x(97)00124-9 |
| Popis: | Energy loss distributions of particles transmitted through free mylar foil of 25 μg/cm 2 thickness for 10–25 keV protons incident at angles 0 ≤ θ 0 ≤ 60° are measured. An analytical treatment is made using the Fokker-Planck approximation for the kinetic equation. Different factors that can affect energy loss distributions were taken into account: energy straggling during inelastic collisions, path length fluctuations due to multiple eleastic collisions and foil thickness fluctuations. A simple formula for the energy spectra FWHM is derived comprising all aforesaid factors. It is shown that the dependence of FWHM on these factors as function of θ 0 is different. So possible contribution of each factor can be evaluated from angle measurements of FWHM. Comparison of the analytical result with the experiment as well as computer simulations using TRIM-like code shows that the main contribution to measured FWHM is due to fluctuations of the inelastic energy losses. |
| Databáze: | OpenAIRE |
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