Electron proportional gas counter for linear and elliptical Moessbauer polarimetry

Journal Article · Mon Feb 15 04:00:00 EST 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3294425· OSTI ID:22053633

Tancziko, F; Sajti, Sz; Deak, L; Merkel, D G; Endro''czi, G; Nagy, D L; Bottyan, L ^[1]; Olszewski, W; Szymanski, K ^[2]

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1. KFKI Research Institute for Particle and Nuclear Physics, P.O.B 49, Budapest H 1525 (Hungary)
2. Faculty of Physics, University of Bialystok, Lipowa 41, Bialystok PL-15-424 (Poland)

Design, characterization, and selected applications of a novel electron detector dedicated to conventional perpendicular- and low-angle-incidence conversion electron Moessbauer spectroscopy are presented. The setup is suitable for varying the incident angle and external magnetic fields on Moessbauer source and absorber. Test experiments were performed on {alpha}-{sup 57}Fe films using a conventional single-line {sup 57}Co(Rh) and magnetically split, {sup 57}Co({alpha}-Fe) Moessbauer sources. The integral ''blackness effect'' in conversion-electron Moessbauer spectra of {sup 57}Fe isotope-enriched absorbers is demonstrated and shown to be pronounced at shallow angles of incidence. In order to determine the alignment and sign of the hyperfine field in an isotope-enriched absorber, the blackness effect is accounted for in a semiempirical way by using single-line source/absorber experimental relative intensities determined independently. This method works with high accuracy for linear polarimetry; however it is only a rough approximation in the case of nearly circular polarimetry.

• OSTI ID: 22053633
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 2 Vol. 81; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCURACY
APPROXIMATIONS
COBALT 57
DESIGN
ELECTRON DETECTION
ELECTRON SPECTRA
INCIDENCE ANGLE
IRON 57
IRON-ALPHA
MAGNETIC FIELDS
MOESSBAUER EFFECT
POLARIMETRY
PROPORTIONAL COUNTERS
THIN FILMS