1. Center for Nuclear Study, University of Tokyo, Wako branch, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
2. Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China
3. Département de Physique, Université Libre de Bruxelles (ULB), 1050 Brussels, Belgium
4. Department of Physics, Kyoto University, Kita-Shirakawa-Oiwake, Sakyo, Kyoto 606-8502, Japan
5. Physique Nucléaire Théorique et Physique Mathématique, Université Libre de Bruxelles (ULB), 1050 Brussels, Belgium
6. INFN-LNS and Dipartimento di Fisica e Astronomia “E. Majorana”, University of Catania, Via S. Sofia 62, 95125 Catania, Italy
7. Department of Physics, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
8. Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
9. Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Via A. Pscoli, 06123 Perugia, Italy
10. INFN Sezione di Perugia, Via A. Pascoli, 06123 Perugia, Italy