1. Joint Institute for Nuclear Research, 141980 Dubna, Russia
2. Moscow Engineering, Physics Institute, 115 409 Moscow, Russia
3. Department of Physics of University of Jyväskylä, FIN-40014 Jyväskylä, Finland
4. Hahn-Meitner-Institut-GmbH, Glienicker Strasse 100, D-14109 Berlin, German
5. Khlopin-Radium-Institute, 194021 St. Petersburg, Russia