1. Nuclear Physics Institute of CAS, Rez, 25068 Prague, Czech Republic
2. Department of Electrical Engineering, Nagaoka University of Technology, Niigata 940-2188, Japan
3. Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973, USA
4. Nishina Center for Accelerator-Based Science, RIKEN, Wako, Saitama 351-0198, Japan