Effects of Local Heating and Premelting in the Terminal Part of the e+ Track

Abstract:

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The terminal part of the e+ track (the positron blob) is formed during ionization slowing down and subsequent ion-electron recombinations produced by a positron. It releases up to 1 keV of energy, which is converted into heat within few picoseconds. If a bulk temperature of a medium is below, but close enough to its melting point, some region of a substance may melt, yielding a peculiar temperature dependence of the lifetime (LT) spectra. We have estimated properties of the molten region with a help of macroscopic heat con- duction equation and suggested a model describing temperature dependence of the ortho- positronium lifetime in frozen methanol, ethanol, butanol and water close to their melting points.

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Periodical:

Edited by:

Jozef Krištiak, Jan Kuriplach and Pradeep K. Pujari

Pages:

15-18

Citation:

D. Zvezhinskiy et al., "Effects of Local Heating and Premelting in the Terminal Part of the e+ Track", Materials Science Forum, Vol. 733, pp. 15-18, 2013

Online since:

November 2012

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