1. KFKI Res. Inst. for Part. Nucl. Physics, P.O.B. 49, H-1525 Budapest 114, Hungary
2. Div. of Mater. Chem., Ruder Boskovic Institute, Bijenicka 54, P.O.B. 180, Zagreb, Croatia
3. Inst. of Isotopes, HAS, H-1525 Budapest, P.O.B. 77, Hungary
4. Flerov Laboratory of Nuclear Reactions, Center of Applied Physics, JINR, Ru-141980 Dubna, Russia
5. Dept. of Mater. Physics, Eötvös Univ., Pázmány Péter sétány 1A, H-1117 Budapest, Hungary
6. ICEMS, Dept. of Physics, University of Coimbra, 3004-516 Coimbra, Portugal
7. Dep. de Engenharia Química, Inst. Superior de Engenharia, 3031-199 Coimbra, Portugal