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Akira Yazaki
Department of Physics, Faculty of Science and Technology, Keio University, Hiyoshi, Yokohama 223
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Keisuke Tajima
Department of Physics, Faculty of Science and Technology, Keio University, Hiyoshi, Yokohama 223
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Yoshiei Todate
Department of Physics, Faculty of Science, Ochanomizu University, Otsuka, Bunkyo–ku, Tokyo 112
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Syoïchi Tomiyoshi
Department of Material Science and Engineering, Faculty of Engineering, Ehime University, Matsuyama 790
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Hironobu Ikeda
National Laboratory for High Energy Physics, Oho, Tsukuba 305