Study of fast-neutron irradiated vitreous silica by positron annihilation methods

Mbungu-Tsumbu; D. Segers; M. Dorikens; L. Dorikens-Vanpraet; C. Laermans; A. Van Den Bosch

doi:10.1016/0022-3093(84)90360-0

Study of fast-neutron irradiated vitreous silica by positron annihilation methods

Mbungu-Tsumbu, D. Segers, M. Dorikens, L. Dorikens-Vanpraet, C. Laermans, A. Van Den Bosch

Research output › peer-review

Abstract

The nature of the glass-like structure as obtained by fast neutron irradiation of vitreous silica has been investigated by positron annihilation lifetime and Doppler broadening experiments. Comparing the annihilation parameters obtained in the unirradiated sample to those obtained in irradiated ones we observed that in the irradiated SiO₂ glasses the probability of positronium formation is reduced and the orthopositronium lifetime is increased. The decrease of the positronium formation probability is mainly attributed to the reduction of the amount of free-volume in compacted domains. The orthopositronium lifetime increase is explained by large free spaces generated along trajectories of fast knocked-on particles.

Original language	English
Pages (from-to)	131-137
Number of pages	7
Journal	Journal of Non-Crystalline Solids
Volume	65
Issue number	1
DOIs	https://doi.org/10.1016/0022-3093(84)90360-0
State	Published - Jun 1984

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

Access to Document

10.1016/0022-3093(84)90360-0

Cite this

@article{56c5813a842b4b82806a67d96440d88c,

title = "Study of fast-neutron irradiated vitreous silica by positron annihilation methods",

abstract = "The nature of the glass-like structure as obtained by fast neutron irradiation of vitreous silica has been investigated by positron annihilation lifetime and Doppler broadening experiments. Comparing the annihilation parameters obtained in the unirradiated sample to those obtained in irradiated ones we observed that in the irradiated SiO2 glasses the probability of positronium formation is reduced and the orthopositronium lifetime is increased. The decrease of the positronium formation probability is mainly attributed to the reduction of the amount of free-volume in compacted domains. The orthopositronium lifetime increase is explained by large free spaces generated along trajectories of fast knocked-on particles.",

author = "Mbungu-Tsumbu and D. Segers and M. Dorikens and L. Dorikens-Vanpraet and C. Laermans and {Van Den Bosch}, A.",

year = "1984",

month = jun,

doi = "10.1016/0022-3093(84)90360-0",

language = "English",

volume = "65",

pages = "131--137",

journal = "Journal of Non-Crystalline Solids",

issn = "0022-3093",

publisher = "Elsevier",

number = "1",

}

TY - JOUR

T1 - Study of fast-neutron irradiated vitreous silica by positron annihilation methods

AU - Mbungu-Tsumbu,

AU - Segers, D.

AU - Dorikens, M.

AU - Dorikens-Vanpraet, L.

AU - Laermans, C.

AU - Van Den Bosch, A.

PY - 1984/6

Y1 - 1984/6

N2 - The nature of the glass-like structure as obtained by fast neutron irradiation of vitreous silica has been investigated by positron annihilation lifetime and Doppler broadening experiments. Comparing the annihilation parameters obtained in the unirradiated sample to those obtained in irradiated ones we observed that in the irradiated SiO2 glasses the probability of positronium formation is reduced and the orthopositronium lifetime is increased. The decrease of the positronium formation probability is mainly attributed to the reduction of the amount of free-volume in compacted domains. The orthopositronium lifetime increase is explained by large free spaces generated along trajectories of fast knocked-on particles.

AB - The nature of the glass-like structure as obtained by fast neutron irradiation of vitreous silica has been investigated by positron annihilation lifetime and Doppler broadening experiments. Comparing the annihilation parameters obtained in the unirradiated sample to those obtained in irradiated ones we observed that in the irradiated SiO2 glasses the probability of positronium formation is reduced and the orthopositronium lifetime is increased. The decrease of the positronium formation probability is mainly attributed to the reduction of the amount of free-volume in compacted domains. The orthopositronium lifetime increase is explained by large free spaces generated along trajectories of fast knocked-on particles.

UR - http://www.scopus.com/inward/record.url?scp=0021439317&partnerID=8YFLogxK

U2 - 10.1016/0022-3093(84)90360-0

DO - 10.1016/0022-3093(84)90360-0

M3 - Article

AN - SCOPUS:0021439317

SN - 0022-3093

VL - 65

SP - 131

EP - 137

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

IS - 1

ER -