Statistical analysis of the doppler broadening coincidence spectrum of electron-positron annihilation radiation in silicon
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Nuclear Instruments and Methods in Physics Research
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We report a statistical analysis of Doppler broadening coincidence data of electron–positron
annihilation radiation in silicon using a 22Na source. The Doppler broadening coincidence spectrum
was fit using a model function that included positron annihilation at rest with 1s, 2s, 2p, and valence
band electrons. In-flight positron annihilation was also fit. The response functions of the detectors
accounted for backscattering, combinations of Compton effects, pileup, ballistic deficit, and pulseshaping problems. The procedure allows the quantitative determination of positron annihilation with
core and valence electron intensities as well as their standard deviations directly from the experimental
spectrum. The results obtained for the core and valence band electron annihilation intensities were
2.56(9)% and 97.44(9)%, respectively. These intensities are consistent with published experimental data
treated by conventional analysis methods. This new procedure has the advantage of allowing one to
distinguish additional effects from those associated with the detection system response function.
Como referenciar
NASCIMENTO, E. do; HELENE, O.; VANIN, V.R.; CRUZ, M.T.F. da; MORALLES, M. Statistical analysis of the doppler broadening coincidence spectrum of electron-positron annihilation radiation in silicon. Nuclear Instruments and Methods in Physics Research, v. 609, n. 2-3, p. 244-249, 2009. Section A. DOI: 10.1016/j.nima.2009.07.051. Disponível em: http://repositorio.ipen.br/handle/123456789/4779. Acesso em: 30 Dec 2025.
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