Mr
1 Nuclear Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai - 400 085 2 Department of Physics, Siksha- Bhavana, Visva-Bharati, Santiniketan - 731 235 3 ILL, 71 Avenue des Martyrs, 38042 Grenoble CEDEX 9, France 4 GANIL, BP 55027, F-14076 Caen Cedex 5, France 5 Università degli Studi di Milano, I-20133 Milano, Italy 6 LPSC, 53 Avenue des Martyrs, 38026 Grenoble, France 7 INFN Sezione di Padova, I-35131 Padova, Italy and 8 Faculty of Physics, University of Warsaw, PL 02-093 Warszawa, Poland