1. Institute of Physics, University of Rzeszow, Rejtana 16A, 35310 Rzeszow, Poland
2. Lviv Polytechnic National University, 12, Bandera St., 79013 Lviv, Ukraine
3. Scientific Research Company "Carat", 202, Stryjska St., 79031 Lviv, Ukraine
4. Gesellschaft für Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt, Germany