1. Department of Energy Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
2. Department of Physics, Nagoya University, Nagoya, Aichi 464-8602, Japan
3. J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
4. Comprehensive Research Organization for Science and Society, Tokai, Ibaraki 319-1106, Japan
5. National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
6. Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0494, Japan