1. Faculty of Physics, University of Białystok, Lipowa 41, 15-424 Białystok, Poland
2. Faculty of Materials Science and Engineering Warsaw University of Technology, Wołoska 141, 02-507 Warszawa, Poland
3. National Centre for Nuclear Research, Andrzeja Sołtana 7, 05-400 Otwock, Poland
4. Cardinal Stefan Wyszyński University, Faculty of Mathematics and Natural Sciences, College of Sciences, Wóycickiego 1/3, 01-938 Warszawa, Poland