2003•Physical review. B, Condensed matterOpen access

Positronium formation in poly(methyl methacrylate)

C. Dauwe, Bartel Van Waeyenberge, N. Balcaen

Abstract

Positron annihilation age momentum correlation (AMOC) experiments were performed in linear poly(methyl methacrylate), PMMA, at 420 K and 100 K. The lifetime and Doppler broadened line-shape $S(t)$ data were analyzed with Byakov and Stepanov's blob model for the formation of positronium. It is shown that the analysis is consistent with a delayed formation of positronium and also offers an alternative explanation for the observed broadening of the annihilation radiation line shape at short times (a few tens of picuseconds) after positron injection, the so called young age broadening.

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Key concepts: Positronium, Annihilation, Doppler broadening, Positron annihilation, Annihilation radiation, Positron, Momentum (technical analysis), Radiation