Effects of local heating and premelting in the terminal part of the e$^+$ track

Physics – Condensed Matter – Other Condensed Matter

Scientific paper

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Scientific paper

Due to the ionizations promoted by the slowing down of energetic positron and subsequent ion-electron recombinations, positron releases up to 1 keV in the terminal blob region [1]. After all this energy converts into heat. This local heating effect makes the medium to heat up and melt, especially at the region where the bulk temperature of the medium is close (but slightly below) the phase transition temperature. In this case this effect leads to a peculiar temperature dependence of the lifetime of the long-lived LT spectra component. We introduce a model to describe the temperature behaviour of the ortho-positronium lifetime for three simple alcohols (methanol, ethanol and butanol) at the melting range.

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