Affiliation: | (1) V.G. Khlopin Radium Institute, 194021 St. Petersburg, Russia;(2) Institute of Physics, St. Petersburg State University, 198904 St. Petersburg, Russia;(3) IKHP, Forschungszentrum Rossendorf e. V., PF 510119, 01314 Dresden, Germany;(4) Department of Physics, University of Notre Dame, Indiana, 46556-5602 |