T.Nakamoto1, K.Ishibashi1, N.Matsufuji1, N.Shigyo1, K.Maehata1, H.Arima1, S.Meigo2, H.Takada2, S.Chiba2, M.Numajiri3 Kyushu Univ., Fukuoka1 Japan Atomic Research Institute (JAERI2 High Energy Accelerator Res. Org. (KEK3
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