1. Faculty of Physics, University of Bialystok, Lipowa 41, 15-424 Białystok, Poland
2. Deutsches Elektronen-Synchrotron-Hasylab, Notkestrasse 85, 22607 Hamburg, Germany
3. H. Niewodniczański Institute of Nuclear Physics of PAN, Radzikowskiego 152, 31-342 Kraków, Poland