1. Faculty of Materials Science, Warsaw University of Technology, Woloska 141, 02-507 Warsaw , Poland
2. Institute of Mathematics and Physics, UTP University of Science and Technology, al. Prof. S. Kaliskiego 7, 85-796 Bydgoszcz , Poland
3. National Centre for Nuclear Research (NCBJ), A. Soltana 7, 05-400 Otwock , Poland
4. Institute of Physics, Polish Academy of Sciences, Lotnikow 32/46, 02-668 Warsaw , Poland