Affiliation: | a Department of Physics, Kurukshetra University, Kurukshetra 136 119, India b Department of Applied Physics, M.L.N. College, Yamuna Nagar 135 001, India c Department of Physics, Guru Nanak Dev University, Amristsar 143 005, India d Department of Physics, Punjabi University, Patiala 147 002, India e Nuclear Science Centre, P.O. Box 10502, New Delhi 110 067, India |