1. Institute of Nuclear PhysicsPolish Academy of Sciences Krakow 31342 Poland
2. SSI Institute for Single CrystalsNational Academy of Sciences of Ukraine av. Nauki 60 Kharkiv 61178 Ukraine
3. Institute of PhysicsKazimierz Wielki University in Bydgoszcz Powstańców Wielkopolskich str., 2 Bydgoszcz 85090 Poland