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8716108 
Journal Article 
Dissolved oxygen and positronium atom in liquid media 
Stepanov, SV; Bokov, AV; Ilyukhina, OV; Byakov, VM 
2020 
12 
1 
107-114 
English 
The interaction of positronium (Ps) with molecular oxygen dissolved in liquids (isooctane, cyclohexane, isopropanol and water) is experimentally investigated. For variation of the O2 concentration the liquids were bubbled with Ar, air and O2. For interpretation of the lifetime annihilation spectra a simple deconvolution of the spectra into three exponentials decaying in time was used. These exponents correspond to para-positronium, free positron and ortho-positronium annihilations. The total reaction rate constant of the Ps atom with dissolved oxygen (which is the sum of two - ortho-para-conversion (Ps → = p-Ps + ¾ o-Ps) and oxidation (Ps + O2 → e+ + O2 -) reaction rate constants) is obtained for each liquid. 2020 Russian Academy of Natural Science. All rights reserved. 
Annihilation; Ortho-para conversion; Oxidation; Positron; Track processes