Ortho-positronium reactions in water studied by positron annihilation age-momentum correlation

Tetsuya Hirade, Toshitaka Oka, Lee Jeong Jae

研究成果: Conference contribution

2 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトルProgress in Positron Annihilation
出版社Trans Tech Publications Ltd
ページ103-108
ページ数6
ISBN(印刷版)9780878492084
DOI
出版ステータスPublished - 2011

出版物シリーズ

名前Materials Science Forum
666
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

フィンガープリント 「Ortho-positronium reactions in water studied by positron annihilation age-momentum correlation」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル