http://hdl.handle.net/20.500.12128/8335
Title: | Relationship between enhanced positronium formation and enhanced positron trapping in polymers at low temperature |
Authors: | Kansy, Jerzy Suzuki, T. |
Keywords: | anihilacja pozytonów; pozytrony; promieniowanie pozytronowe; promieniowanie elektronowe |
Issue Date: | 2006 |
Citation: | Acta Physica Polonica A, Vol. 110, nr 5 (2006), s. 593-596 |
Abstract: | Positron annihilation lifetime spectroscopy is used for investigation of low-density polyethylene and ethylene-methyl methacrylate copolymers of 1.45, 3.0, and 5.4 mole% of methyl methacrylate. The lifetime spectra are collected at 30 K, one by one, as a function of elapsed time. In the computer analysis a new theoretical model is de eloped, which enables separating the annihilation from positron free state, its trapped state and bound state in positronium. The positron trapping rate ¹ and the enhanced positronium formation rate · are determined. The calculated values of ¹ and · turned out to be linearly correlated. This correlation presumably originates from an in°uence of trapped electrons on the trapping of positrons. The dependences of · on measurement time are determined for low-density polyethylene and ethylene-methyl methacrylate of different methyl methacrylate content. A theoretical model describing quantitatively the dependences is proposed. The model considers the processes of electron{ion recombination, electron trapping, and electron scavenging by dipolar carbonyl groups supplied by methyl methacrylate additives. |
URI: | http://hdl.handle.net/20.500.12128/8335 |
ISSN: | 0587-4246 |
Appears in Collections: | Artykuły (WNŚiT) |
File | Description | Size | Format | |
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Kansy_Relationship_between_enhanced_positronium.pdf | 416,82 kB | Adobe PDF | View/Open |
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