Paper Title:
Ortho-Positronium Reactions in Water Studied by Positron Annihilation Age-Momentum Correlation
  Abstract

Temperature dependence on S(t), positron age dependent shape parameter of annihilation gamma-rays, in water was observed. S(t) at the ortho-Ps pick off annihilation time region were higher at higher temperatures. It is indicating that there are more reactions of ortho-Ps at higher temperature. Hence it was successfully indicated that the longest lifetime, i.e. ortho-Ps component, on positron annihilation lifetime spectra for water could be shorter at higher temperatures. The radical reactions, such as PsOH formation or ortho-Ps oxidation by hydroxyl radicals, are spin dependent reactions. The geminate pair of ortho-Ps and hydroxyl radical in water can give spin dependent reaction and the enhancement of S(t) with certain time interval, i.e. quantum beats, were expected. It was observed even for water at 11°C. It is probably indicating the hyperfine coupling constants of hydroxyl radicals in water.

  Info
Periodical
Edited by
Radosław Zaleski
Pages
103-108
DOI
10.4028/www.scientific.net/MSF.666.103
Citation
T. Hirade, T. Oka, L. J. Jae, "Ortho-Positronium Reactions in Water Studied by Positron Annihilation Age-Momentum Correlation", Materials Science Forum, Vol. 666, pp. 103-108, 2011
Online since
December 2010
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