Institution: | 1. Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan;2. Japan Atomic Energy Agency (JAEA), 2-4 Shirane, Tokai, Ibaraki 319-1195, Japan;3. Faculty of Engineering, Aomori University, 2-3-1 Kouhata, Aomori, Aomori 090-0943, Japan |