Positron and Positronium Trapping in Heat Treated Zeolites (Ceramics), the Effect of Swift Heavy Ion Irradiation

P. Major a, Zs. Kajcsos a, L. Liszkay a, P. Zalán a, C. Kosanović b, S. Bosnar b, B. Subotić b, K. Lázár c, V.A. Skuratov d, K. Havancsák e, P.M. Gordo f and M.F. Ferreira Marques g a KFKI Res. Inst. for Part. Nucl. Physics, P.O.B. 49, H-1525 Budapest 114, Hungary b Div. of Mater. Chem., Ruder Boskovic Institute, Bijenicka 54, P.O.B. 180, Zagreb, Croatia c Inst. of Isotopes, HAS, H-1525 Budapest, P.O.B. 77, Hungary d Flerov Laboratory of Nuclear Reactions, Center of Applied Physics, JINR, Ru-141980 Dubna, Russia e Dept. of Mater. Physics, Eötvös Univ., Pázmány Péter sétány 1A, H-1117 Budapest, Hungary f ICEMS, Dept. of Physics, University of Coimbra, 3004-516 Coimbra, Portugal g Dep. de Engenharia Química, Inst. Superior de Engenharia, 3031-199 Coimbra, Portugal

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Received: 3 09 2007;

A systematic study of zeolite precursor gels, zeolites, and products of their recrystallization to ceramics was carried out in presence of various alkali ions. The investigation of radiation damage induced by high-energy ion beam irradiation with swift heavy ions (Bi ions at 670 MeV energy with 4×1012 ion/cm2 fluence) was also included. The shortening of lifetimes found after irradiation in ceramics might probably be ascribed to interactions of o-Ps with free radicals and other quenching agents created through the ion irradiation. These lifetime-shortening interactions probably partly hide the o-Ps trapping in free volume sites.

DOI: 10.12693/APhysPolA.113.1441 PACS numbers: 78.70.Bj, 61.43.Gt, 36.10.Dr, 61.80.Jh