The authors thank the operating staff of the Pelletron acceleratorsa t the Nuclear Science Centre Delhi as well as at the Institute of Physics Bhubaneswar. Thanks are also due to Mr. D. Kabiraj for the preparationo f the targets. One of the authors (H.R.V.) is indebted to the DST;
Ministry of Science and Technology;
Govt. of India and the Nuclear Science Centre/UGC for the grant of research projects. J.S.B. and D.P.G. are thankful to DST and UGC for the award of JRF and Teacher fellowship respectively;