Dr. Ahmed Hashim Mohaisen Al-Yasari, Department of Physics, College of Education For Pure Science, University of Babylon, Hilla, IRAQ
E-mail: ahmed_taay@yahoo.com
Dr. Ibrahim Ramadhan Agool, Professor, Department of Physics, College of Science, Al-Mustansiriyah University, IRAQ
E-mail: Ibrahimphysics@yahoo.com