Affiliation: | (1) Department of Solid State Engineering, Institute of Chemical Technology, 166 28 Prague, Czech Republic (Fax: +420-2/2431-0337, E-mail: svorcikv @ vscht.cz), CZ;(2) Institute of Nuclear Physics, Academy of Science of the Czech Republic, 250 68 Řež, Czech Republic (E-mail: hnatowicz @ ujf.cas.cz), CZ |