1. Deanship of Scientific Research, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia
2. Sudan Atomic Energy Commission, Khartoum, Sudan
3. Department of Physics, Taibah University, Al-Madinah, Saudi Arabia
4. Department of Physics, College of Science and Arts in Uglat Asugour, Qassim University, Uglat Asugour, Saudi Arabia
5. Department of Physics, University of Kassala, Sudan