Institution: | 1. Department of Physics, Tohoku University, Sendai 980-8578, Japan;2. Nuclear Physics Institute, 25068 ?e?, Czech Republic;3. Department of Electrical and Electronic Engineering, Akita University, Akita 010-8502, Japan;4. Laboratory of Nuclear Science, Tohoku University, Sendai 982-0826, Japan;5. Department of Electrical Engineering, Ichinoseki National College of Technology, Ichinoseki 021-8511, Japan |