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Koji Imai
Department of Physics, College of Science and Technology, Nihon University, Tokyo 101–8308
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Kimiaki Konno
Department of Physics, College of Science and Technology, Nihon University, Tokyo 101–8308
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Hiroshi Kakuhata
Tsuruga Junior College, Tsuruga 914–0814 Atomic Energy Research Institute, Nihon University, Tokyo 101–8308