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Seisi Kosegawa
Department of Materials Science, Faculty of Science, Hiroshima University, Higashi–Hiroshima 724
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Susumu Ikeda
National Laboratory for High Energy Physics, Oho 1–1, Tsukuba 305
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Yasuhiro Wada
Department of Materials Science, Faculty of Science, Hiroshima University, Higashi–Hiroshima 724
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Kazuyuki Itoh
Department of Materials Science, Faculty of Science, Hiroshima University, Higashi–Hiroshima 724