1. Scientific-Practical Materials Research Centre; NAS of Belarus; 19 P. Brovka str. 220072 Minsk Belarus
2. Research Institute for Nuclear Problems; Belarusian State University; 11 Bobruiskaya str. 220030 Minsk Belarus
3. Departamento de Física and I3N; Universidade de Aveiro; 3810-193 Aveiro Portugal
4. National University of Science and Technology “MISiS”; 119049 Moscow Russia