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Diffusion and localization of o-Ps in D2O determined from positron annihilation in SDS micellar solutions

✍ Scribed by Sz. Vass; Zs. Kajcsos; B. Molnár

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
443 KB
Volume
118
Category
Article
ISSN
0009-2614

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✦ Synopsis

A rnicroxopic diffusion male1 is prescored for the determin ation of orthopositronium (UPS) hfetime in rnicellar solutions.

Among other paraketers. the lifetime density function depends on the o-Ps diffusion coefficient in

the water phase. Orthoposirronium diffusion coefficients are determined by fitting this lifetime density function to positron annihilation spectra obtained from 1 mol/drr? solution of sodium dodeqkulphate (SDS) in D,O at different kmperatures. The activation energy of the UPS diffusion in D20 obtained from an Arrhtius plot as E, = 0-k &O.l, eV indicates sting localization.

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