Affiliation: | 1. Graduate School of Science, Osaka University, Osaka, Toyonaka, 560-0043, Japan 2. Faculty of Science, Niigata University, Niigata, Niigata, 950-2181, Japan 3. Radioisotope Research Center, Osaka University, Suita, Osaka, 565-0871, Japan 4. School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan 5. Research Reactor Institute, Kyoto University, Kumatori, Osaka, 590-0494, Japan
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