1. IREN, Nangui Abrogoua University, Abidjan, Ivory Coast
2. PRESN, Department of Physics, FSR, Mohammed V University, Rabat, Morocco
3. LASMES, SSMT, Félix Houphouet Boigny University, Abidjan, Ivory Coast
4. Direction of Studies and Scientific Researches, National Centre of Nuclear Energy Sciences and Techniques, Rabat, Morocco