[1] ARISTOTELIAN UNIV SALONIKA, DEPT NUCL PHYS, SALONIKA, GREECE
[2] UNIV KARLSRUHE, INST KERNPHYS, D-7500 KARLSRUHE, FED REP GER
[3] UNIV BASEL, INST PHYS, CH-4051 BASEL, SWITZERLAND
[4] RES INST PHYS, STOCKHOLM, SWEDEN
[5] CTR RECH NUCL, F-67037 STRASBOURG, FRANCE
[6] UNIV STRASBOURG 1, F-67070 STRASBOURG, FRANCE