1. Department of Physics, St. Petersburg State University, Universitetskaya 7/9, 199034 St. Petersburg, Russia
2. National Research Centre Kurchatov Institute B.P. Konstantinov Petersburg Nuclear Physics Institute, Orlova Roscha, 188300 Gatchina, Russia
3. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, D-64291 Darmstadt, Germany
4. Department of Chemistry, Faculty of Natural Sciences, Matej Bel University, Tajovského 40, 97401 Banská Bystrica, Slovakia