1. Faculty of Physics, University of Bucharest, Atomistilor 405, 077125 Magurele-Ilfov, Romania
2. Research Institute of the University of Bucharest (ICUB), 90 Panduri Street, 050663 Bucharest, Romania
3. Horia Hulubei National Institute for Physics and Nuclear Engineering, Reactorului 30, 077125 Magurele-Ilfov, Romania
4. Department of Engineering, Reykjavik University, Menntavegur 1, IS-102 Reykjavik, Iceland