Scattering of 7.3 keV conversion electrons from a Co-57 source covered gradually by gold absorbers of various thicknesses

0185676 - UJF-V 20020170 RIV NL eng J - Journal Article
Dragoun, Otokar - Špalek, Antonín - Kovalík, Alojz - Yakushev, E. A. - Ryšavý, Miloš - Frána, Jaroslav - Brabec, Vlastislav - Novgorodov, A. F. - Liljequist, D.
Scattering of 7.3 keV conversion electrons from a Co-57 source covered gradually by gold absorbers of various thicknesses.
Nuclear Instruments & Methods in Physics Research Section B. Roč. 194, č. 2 (2002), s. 112-122. ISSN 0168-583X. E-ISSN 1872-9584
Institutional research plan: CEZ:AV0Z1048901
Keywords : electron scattering * thin gold layers * Co-57 * neutron activation analysis
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 1.158, year: 2002

The conversion electrons emitted with initial energy of 7.3 keV from the K-shell of 57 Fe atoms were measured with an electrostatic spectrometer set to the instrumental resolution of 7 eV. The source - Co-57 on an Al backing - was covered in successive steps by six evaporated Au layers and changes of the line shapes were recorded. The thicknesses of the Au absorbers determined by neutron activation analysis varied from 2.7 to 21 nm, i.e. up to about three times the inelastic mean free path of 7.3 keV electrons. The individual elastic and inelastic scattering events in the Al backing, Au absorbers and carbonaceous contamination overlayer were simulated by the Monte Carlo method. When the Au energy loss function derived by Yoshikawa et al. was applied in MC simulations, a reasonable agreement with measured line shapes was reached even for the thickest Au absorbers.
Permanent Link: http://hdl.handle.net/11104/0082062