Affiliation: | 1. Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt;2. Laboratoire Structures, Propriétes et Modélisation des Solides (SPMS), CNRS-UMR8580, Ecole Centrale Paris, 92295 Chatenay-Malabry, France;3. Physics Department, Faculty of Science, Beirut Arab University, Beirut, Lebanon;4. Accelerator Laboratory, Lebanese Atomic Energy Commission, CNRS, Beirut, Lebanon |