Affiliation: | 1. Neutron Science Laboratory, KEK, 1-1 Oho, Tsukuba, 305-0801, Japan 2. Department of Physics, Niigata University, 2-8050 Ikarashi, Niigata, 951-2181, Japan 3. Radioisotope Center, Niigata University, 1-757 Asahimati, Niigata, 951-8510, Japan 4. Faculty of Engineering, University of Toyama, 3190 Gofuku, Toyama, 930-8555, Japan
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