Positronium in silica-based glasses
| Autor: | Zheng Tang, Yasuyoshi Nagai, Masuyuki Hasegawa, Y. Sasaki, Koji Inoue, Hideaki Ohkubo |
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| Rok vydání: | 2003 |
| Předmět: |
Radiation
Annihilation Materials science Borosilicate glass Analytical chemistry Alkali metal Condensed Matter::Disordered Systems and Neural Networks Positronium Condensed Matter::Soft Condensed Matter Lead glass Positron visual_art Annihilation radiation Physics::Atomic and Molecular Clusters visual_art.visual_art_medium Physics::Atomic Physics Spectroscopy Nuclear chemistry |
| Zdroj: | Radiation Physics and Chemistry. 68:569-572 |
| ISSN: | 0969-806X |
| DOI: | 10.1016/s0969-806x(03)00233-0 |
| Popis: | Structural subnanovoids in silica-based glasses (synthetic silica, borosilicate glass, lead glass, alkali barium glass, soda-lime glass and model glass of radioactive waste glass) with several SiO 2 concentrations are studied by positron lifetime and one-dimensional angular correlation of annihilation radiation spectroscopy. The average sizes of the structural subnanovoids are estimated from the pick-off annihilation rates of the ortho -positronium and from the momentum distribution of the para -positronium. It is observed that the sizes of the subnanovoids and the positronium intensities decrease with decreasing SiO 2 concentrations in the glasses, which suggests that the positronium is a unique and useful tool for subnanovoids in glass materials. |
| Databáze: | OpenAIRE |
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