Affiliation: | 1. Institute of Physics , National Academy of Sciences , 68 Nezavisimosti Pr, 220072 , Minsk , Belarus voitovich@imaph.bas-net.by;3. Institute of Physics , National Academy of Sciences , 68 Nezavisimosti Pr, 220072 , Minsk , Belarus;4. Institute for Nuclear Problems , Belarusian State University , Minsk , Belarus;5. Department of the Institute of Laser Physics, Siberian Branch , Russian Academy of Sciences , Irkutsk , Russia |