1. Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30,30 059 Kraków, Poland
2. Institute of Materials Science, Technische Universität Darmstadt, Petersenstrasse 23, 64287 Darmstadt, Germany
3. Dynamitron Tandem Labor, Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum, Germany
4. Institute of Physics, Pedagogical University, Podchorążych 2, 30 084 Kraków, Poland
5. Faculty of Electrical Engineering, Automatics, Computer Science and Electronics, AGH University of Science and Technology, al. Mickiewicza 30, 30 059 Kraków, Poland
6. Department of Materials Science, The H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31 342 Kraków, Poland