1. Research Center of Nuclear Physics, Osaka Univ., 10-1 Mihogaoka, Ibaraki, Osaka, Japan
2. School of Science, Huzhou Teachers College, Huzhou, 313000/Zhejiangone, P. R. China
3. GANIL, CEA/DSM-CNRS/IN3P3, BP 55027, F-14076 Caen cedex 5, France
4. Univ. of Caen, BP 5186, F-14032 Caen cedex, France
5. Institut Physique Theorique, Direction des Sciences de la Matiere, Centre d'Etudes-Saclay, Gif-sur-Yvette. F-91191, France