1. Nuclear Physics Institute, Academy of Sciences of the Czech Republic, Řež 130, 250 68 Řež, Czech Republic
2. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Trojanova 13, 120 00 Prague 2, Czech Republic
3. Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Dolejškova 5, 182 00 Prague 8, Czech Republic