1. Institute
of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
2. Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland
3. CNR-IPCF, Largo B. Pontecorvo
3, I-56127 Pisa, Italy
4. Dipartimento
di Fisica, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy
5. Faculty
of Mathematics and Computer Science, University of Warmia and Mazury in Olsztyn, Sloneczna 54, Olsztyn PL-10710, Poland