1. Department of Physics, Kyoto University, Sakyo, Kyoto 606-8502, Japan
2. Institute of Particle and Nuclear Studies, KEK, Tsukuba, Ibaraki 305-0801, Japan
3. Center for Integrated Research in Fundamental Science and Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
4. RIKEN Nishina Center, RIKEN, Wako, Saitama 351-0198, Japan
5. Institute for Innovative Science and Technology, Nagasaki Institute of Applied Science, Nagasaki 851-0121, Japan
6. Department of Physics, Tohoku University, Sendai 980-8578, Japan
7. RIKEN Cluster for Pioneering Research, RIKEN, Wako, Saitama 351-0198, Japan
8. Japan Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan
9. Department of physics, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
10. Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka 567-0047, Japan
11. Brookhaven National Laboratory, Upton, NY, 11973-5000, U.S.A.
12. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
13. Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan