- Tytuł:
- Positrons and Positroniu m in Grainy and Porous Solids
- Autorzy:
-
Kajcsos, Zs.
Liszkay, L.
Duplâtre, G.
Varga, L.
Lázár, K.
Pál-Borbély, G.
Beyer, H.
Lohonyai, L.
Caullet, P.
Patarin, J. - Powiązania:
- https://bibliotekanauki.pl/articles/2025110.pdf
- Data publikacji:
- 2001
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
78.70.Bj
36.10.Dr
61.43.Gt - Opis:
- Systematic investigations have been performed using positron annihilation techniques on micrograins of crystalline powders (e.g., MgO, Al$\text{}_{2}$O$\text{}_{3}$, SiO$\text{}_{2}$) 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.
- Źródło:
-
Acta Physica Polonica A; 2001, 99, 3-4; 399-406
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł