1. Skobeltsyn Institute of Nuclear Physics, Moscow State University, 119899 Moscow, Russia
2. Joint Institute for Nuclear Research, LNP, P. O. Box 79, Moscow, Russia
3. P. J. Safarik University, Department of Organic Chemistry, 04167 Kosice, Slovakia
4. Vereshchagin Institute of High Pressure Physics, RAS, 142092 Troitsk, Moscow reg., Russia