Institution: | a Faculty of Physics, Theoretical Physics Laboratory, University of Bab-Ezzouar, USTHB, B.P. 32, El Alia, Algiers 16111, Algeria b Laboratoire de Physique Quantique et Systèmes Dynamiques, Department of Physics, Setif University, Setif 19000, Algeria c Institute of Nuclear Research, 72 Tzarigradsko chaussée, 1784 Sofia, Bulgaria |