Positronium formation at low temperatures: The role of trapped electrons

T. Hirade; F.H.J. Maurer; Morten Mostgaard Eldrup

doi:10.1016/S0969-806X(00)00201-2

Positronium formation at low temperatures: The role of trapped electrons

T. Hirade, F.H.J. Maurer, Morten Mostgaard Eldrup

Research output: Contribution to journal › Conference article › Research › peer-review

Abstract

Measurements have been carried out of electron spin densities (by electron spin resonance technique) and positronium (Ps) formation probability as functions of Co-60 gamma-irradiation dose in poly(methyl methacrylate) and linear poly(ethylene) at 77 K. We observe a linear relationship between the enhancement of the Ps formation and the density of trapped electrons in both polymers. This clear correlation strongly supports the previous suggestion by the authors that the increase in Ps formation with time (that has been observed at low temperatures for a number of polymers) can be explained as a reaction of free positrons with trapped electrons produced by the previously injected positrons. (C) 2000 Elsevier Science Ltd. All rights reserved.

Original language	English
Journal	Radiation Physics and Chemistry
Volume	58
Issue number	5-6
Pages (from-to)	465-471
ISSN	0969-806X
DOIs	https://doi.org/10.1016/S0969-806X(00)00201-2
Publication status	Published - 2000
Event	6th International workshop on positron and positronium chemistry (PPC 6) - Tsukuba, Japan Duration: 7 Jun 1999 → 11 Jun 1999 Conference number: 6

Conference

Conference	6th International workshop on positron and positronium chemistry (PPC 6)
Number	6
Country/Territory	Japan
City	Tsukuba
Period	07/06/1999 → 11/06/1999

Keywords

Positronium
Trapped electrons
Low temperature
Gamma-irradiation
Visible light
Polymer

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10.1016/S0969-806X(00)00201-2

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title = "Positronium formation at low temperatures: The role of trapped electrons",

abstract = "Measurements have been carried out of electron spin densities (by electron spin resonance technique) and positronium (Ps) formation probability as functions of Co-60 gamma-irradiation dose in poly(methyl methacrylate) and linear poly(ethylene) at 77 K. We observe a linear relationship between the enhancement of the Ps formation and the density of trapped electrons in both polymers. This clear correlation strongly supports the previous suggestion by the authors that the increase in Ps formation with time (that has been observed at low temperatures for a number of polymers) can be explained as a reaction of free positrons with trapped electrons produced by the previously injected positrons. (C) 2000 Elsevier Science Ltd. All rights reserved. ",

keywords = "Industrielle materialer, Positronium, Trapped electrons, Low temperature, Gamma-irradiation, Visible light, Polymer",

author = "T. Hirade and F.H.J. Maurer and Eldrup, {Morten Mostgaard}",

year = "2000",

doi = "10.1016/S0969-806X(00)00201-2",

language = "English",

volume = "58",

pages = "465--471",

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TY - GEN

T1 - Positronium formation at low temperatures: The role of trapped electrons

AU - Hirade, T.

AU - Maurer, F.H.J.

AU - Eldrup, Morten Mostgaard

N1 - Conference code: 6

PY - 2000

Y1 - 2000

N2 - Measurements have been carried out of electron spin densities (by electron spin resonance technique) and positronium (Ps) formation probability as functions of Co-60 gamma-irradiation dose in poly(methyl methacrylate) and linear poly(ethylene) at 77 K. We observe a linear relationship between the enhancement of the Ps formation and the density of trapped electrons in both polymers. This clear correlation strongly supports the previous suggestion by the authors that the increase in Ps formation with time (that has been observed at low temperatures for a number of polymers) can be explained as a reaction of free positrons with trapped electrons produced by the previously injected positrons. (C) 2000 Elsevier Science Ltd. All rights reserved.

AB - Measurements have been carried out of electron spin densities (by electron spin resonance technique) and positronium (Ps) formation probability as functions of Co-60 gamma-irradiation dose in poly(methyl methacrylate) and linear poly(ethylene) at 77 K. We observe a linear relationship between the enhancement of the Ps formation and the density of trapped electrons in both polymers. This clear correlation strongly supports the previous suggestion by the authors that the increase in Ps formation with time (that has been observed at low temperatures for a number of polymers) can be explained as a reaction of free positrons with trapped electrons produced by the previously injected positrons. (C) 2000 Elsevier Science Ltd. All rights reserved.

KW - Industrielle materialer

KW - Positronium

KW - Trapped electrons

KW - Low temperature

KW - Gamma-irradiation

KW - Visible light

KW - Polymer

U2 - 10.1016/S0969-806X(00)00201-2

DO - 10.1016/S0969-806X(00)00201-2

M3 - Conference article

SN - 0969-806X

VL - 58

SP - 465

EP - 471

JO - Radiation Physics and Chemistry

JF - Radiation Physics and Chemistry

IS - 5-6

T2 - 6th International workshop on positron and positronium chemistry (PPC 6)

Y2 - 7 June 1999 through 11 June 1999

ER -

Positronium formation at low temperatures: The role of trapped electrons

Abstract

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Keywords

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