Positron and positronium trapping in heat treated zeolites (Ceramics), the effect of swift heavy ion irradiation

KFKI Res. Inst. for Part. Nucl. Physics P.O.B. 49, H-1525 Budapest 114, Hungary Div. of Mater. Chem., Ruder Boskovic Institute Bijenicka 54, P.O.B. 180, Zagreb, Croatia Inst. of Isotopes, HAS, H-1525 Budapest, P.O.B. 77, Hungary Flerov Laboratory of Nuclear Reactions, Center of Applied Physics, JINR Ru-141980 Dubna, Russia Dept. of Mater. Physics, Eotvos Univ. Pazmany Peter setany 1A, H-1117 Budapest, Hungary f ICEMS, Dept. of Physics, University of Coimbra 3004-516 Coimbra, Portugal Dep. de Engenharia Quimica, Inst. Superior de Engenharia 3031-199 Coimbra, Portugal