1. Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho Inage-ku, Chiba 263-8522, Japan
2. Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203-5017, United States
3. Diffraction and Scattering Division, Center for Synchrotron Radiation Research, Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
4. High Field NMR Group, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
5. Department of Applied Quantum Physics & Nuclear Engineering, Kyushu University, Fukuoka 819-0395, Japan
6. Nuclear Waste Management Organization of Japan (NUMO), Mita NN Building, 2nd Floor, 1-23 Shiba 4-chome, Minato-ku, Tokyo 108-0014, Japan