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Akinori Tanaka
Department of Physics, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578 Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA
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Tazumi Nagasawa
Department of Physics, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578
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Yuitsu Takeda
Department of Physics, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578
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Neil J. Watkins
Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA
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Yongli Gao
Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA