Positrons and Positroniu m in Grainy and Porous Solids

• Authors: Zs. Kajcsos , L. Liszkay , G. Duplâtre , L. Varga , K. Lázár , G. Pál-Borbély , H. Beyer , L. Lohonyai , P. Caullet , J. Patarin
• Languages of publication: EN

Abstracts

EN

Systematic investigations have been performed using positron annihilation techniques on micrograins of crystalline powders (e.g., MgO, Al_2O_3, SiO_2) and on various zeolites (e.g., silicalite 1, Na-X, Na-Y, ZSM-5, mordenite) aiming at a better under standing of the formation and decay of the long-lived ortho-positronium states. The techniques were lifetime spectroscopy, Doppler-effect measurements and the recording of the full energy distribution of the annihilation radiation. The influences of heat treatment, sample evacuation and presence of gases were investigated. Lifetimes over 130 ns and o-Ps fractions of about 30% were found. A strong correlation of positron annihilation technique data with a water content of the samples was evidenced. Possible pictures of the formation and decay of ortho-positronium in porous media are discussed.

Keywords

EN

78.70.Bj; 36.10.Dr; 61.43.Gt

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)
• 61.43.Gt: Powders, porous materials
• 36.10.Dr: Positronium(see also 82.30.Gg Positronium chemistry)

• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 99
• Issue: 3-4
• Pages: 399-406

Dates

published

2001-03/04

received

2000-09-18

Contributors

author

Zs. Kajcsos

• KFKI Res. Inst. for Part. Nucl. Physics, P.O.B. 49, 1525 Budapest 114, Hungary

author

L. Liszkay

• KFKI Res. Inst. for Part. Nucl. Physics, P.O.B. 49, 1525 Budapest 114, Hungary

author

G. Duplâtre

• Lab. Chim. Nucléaire, IReS, IN2P3, CNRS, BP. 28, 67037 Strasbourg Cedex 2, France

author

L. Varga

• KFKI Res. Inst. for Part. Nucl. Physics, P.O.B. 49, 1525 Budapest 114, Hungary

author

K. Lázár

• Inst. of Isotope and Surface Chemistry, P.O.B. 77, 1525 Budapest, Hungary

author

G. Pál-Borbély

• Centr. Res. Inst. for Chemistry, P.O.B. 19, 1525 Budapest, Hungary

author

H. Beyer

• Centr. Res. Inst. for Chemistry, P.O.B. 19, 1525 Budapest, Hungary

author

L. Lohonyai

• KFKI Res. Inst. for Part. Nucl. Physics, P.O.B. 49, 1525 Budapest 114, Hungary

author

P. Caullet

• Lab. Mat. Minéraux, URA CNRS 428, 3 rue A. Werner, 68093 Mulhouse Cedex, France

author

J. Patarin

• Lab. Mat. Minéraux, URA CNRS 428, 3 rue A. Werner, 68093 Mulhouse Cedex, France

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Identifiers

DOI

10.12693/APhysPolA.99.399