Positrons and positronium in grainy and porous solids

Zs Kajcsos, L. Liszkay, G. Duplâtre, L. Varga, K. Lázár, G. Pál-Borbély, H. K. Beyer, L. Lohonyai, P. Caullet, J. Patarin

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Abstract

Systematic investigations have been performed using positron annihilation techniques on micrograins of crystalline powders (e.g., MgO, Al2O3, SiO2) and on various zeolites (e.g., silicalite 1, Na-X, Na-Y, ZSM-5, mordenite) aiming at a better understanding 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.

Original languageEnglish
Pages (from-to)399-406
Number of pages8
JournalActa Physica Polonica A
Volume99
Issue number3-4
DOIs
Publication statusPublished - Jan 1 2001
Event32nd Polish Seminar on Positron Annihilation - Jarnoltowek, Poland
Duration: Sep 18 2000Sep 22 2000

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Kajcsos, Z., Liszkay, L., Duplâtre, G., Varga, L., Lázár, K., Pál-Borbély, G., Beyer, H. K., Lohonyai, L., Caullet, P., & Patarin, J. (2001). Positrons and positronium in grainy and porous solids. Acta Physica Polonica A, 99(3-4), 399-406. https://doi.org/10.12693/APhysPolA.99.399