1. a M M Mahila College (Veer Kunwar Singh University) , Ara PIN-802301, Bihar, India
2. b P G Department of Physics , R N College Hajipur , Vaishali, Bihar, India
3. c Variable Energy Cyclotron Centre. DAE , 1/AF Bidhannagar, Kolkata, 700064
4. d Department of Physics , Bose Institute , 93/1, Acharya Prafulla Chandra Road, Kolkata, 700009