Competitive positron and positronium trapping in porous media

• Autor(a) principal: Kajcsos, Zs.
• Data de Publicação: 2007
• Outros Autores: Liszkay, L., Duplâtre, G., Lázár, K., Lohonyai, L., Varga, L., Gordo, P. M., Lima, A. P. de, Gil, C. Lopes de, Marques, M. F. Ferreira, Bosnar, D., Bosnar, S., Kosanovic, C., Subotic, B.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/4387; https://doi.org/10.1016/j.radphyschem.2006.03.041
• topic: Positron annihilation in zeolites; Positronium trapping; Long-living o-Ps states

Positron annihilation acquired acceptance for structural investigation of solids but results in porous media--where positron lifetime spectroscopy (LT) reveals substantial Ps formation--were ambiguous. Data on zeolites lead to the conclusion that Ps trapping in competing "extended free volume" sites, inhomogeneous regions and grain boundaries occurs. Furthermore, positron trapping must also be considered. Systematic errors due to incomplete time range selection are discussed, significance and importance of corrections for 3[gamma]/2[gamma] counting efficiency differences are shown in practice.