1. Budker Institute of Nuclear Physics, Lavrentiev Prospectll, Novosibirsk, 630090, Russia, p.a.bagryansky@inp.nsk.su
2. Forschungszentrum Rossendorf, Postfach 51 01 19, 01314 Dresden, Germany
3. Novosibirsk State University, Pirogova 2, Novosibirsk, 630090, Russia