Positronium in Metal-Oxide Powders Studied with Age. The Age-Momentum Correlation Technique

• Authors: B. Van Waeyenberge , Ch. Dauwe
• Languages of publication: EN

Abstracts

EN

For the first time positronium is investigated in fine powders of MgO and Al_2O_3 using age-momentum correlation technique based on a relativistic positron beam. The application of this technique for investigating the interaction of positronium with the grain surfaces is discussed and compared with other techniques. The previously reported interaction of the positronium with paramagnetic centres is further studied. A qualitative interpretation of the spectra is given. In the Al_2O_3 samples we found some unexpected behaviour of the conversion quenching of ortho-positronium at irradiation induced paramagnetic surface defect.

Keywords

EN

36.10.Dr; 41.75.Fr; 78.70.Bj

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 41.75.Fr: Electron and positron beams
• 36.10.Dr: Positronium(see also 82.30.Gg Positronium chemistry)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 100
• Issue: 5
• Pages: 707-715

Dates

published

2001-11

received

2001-05-14

Contributors

author

B. Van Waeyenberge

• NUMAT, Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, 9000 Gent, Belgium

author

Ch. Dauwe

• NUMAT, Department of Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, 9000 Gent, Belgium

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Identifiers

DOI

10.12693/APhysPolA.100.707