Affiliation: | a Physics Department, Nuclear and Particle Physics Division, University of Athens, Panepistimioupolis, GR-157 71, Athens, Greece b Service de Physique Nucléaire-Basse Energie, CEN Saclay, F-91191, Gif-sur-Yvette Cedex, France c INFN-LNS and Physics Department, University of Catania, 57, Corso Italia, I-95129, Catania, Italy d GANIL, B.P. 5027, F-14021, Caen Cedex, France |