1. Department of PhysicsLomonosov Moscow State University119991 MoscowRussia
2. Faculty of Mathematics and Natural SciencesPhysics DepartmentUniversity of Wuppertal42119 WuppertalGermany
3. National Research Center “Kurchatov Institute”123182 MoscowRussia
4. Moscow Institute of Physics and Technology141700 MoscowRussia
5. Department of Physics and MathematicsUniversity of Eastern Finland80101 JoensuuFinland
6. Faculty of General Sciences and Microsystems TechnologyOTH Regensburg93053 RegensburgGermany