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Positronium Decay in Silica Sol-Gels

Published online by Cambridge University Press:  28 February 2011

B. Hopkins ,
C. A. Quarles  and
T. W. Zerda
B. Hopkins
Affiliation:
Physics department, Texas Christian University, Fort Worth, TX 76129
C. A. Quarles
Affiliation:
Physics department, Texas Christian University, Fort Worth, TX 76129
T. W. Zerda
Affiliation:
Physics department, Texas Christian University, Fort Worth, TX 76129
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Abstract

Positronium lifetimes inside porous silica are measured and discussed in terms of surface interactions, oxygen and nitrogen induced quenching and pore sizes. Surface interactions are studied for silica gels having surfaces covered solely with hydroxyl or methoxy groups. A rapid decay of positronium inside the pores filled with gaseous or liquid oxygen is reported and explained in terms of quenching mechanisms. An increase in the measured lifetimes for pores filled with nitrogen is attributed to the change in the pore distribution function.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 325
Copyright
Copyright © Materials Research Society 1990

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References

LITERATURE

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