1. Institute for Materials Research, Tohoku University, Sendai, 980-8577 Japan, Tel. +81-22-215-2060
2. Tokyo Institute of Technology, Meguroku, Tokyo, 152-8550 Japan
3. Japan Institute of Nuclear Fuel Cycle, Oarai, Ibaraki, 311-1394 Japan
4. Oak Ridge National Laboratory, Tennessee, 37831-6138 USA
5. The Wakasawan Energy Research Center, Tsuruga, 914-0192 Japan
6. Institute for Materials Research, Tohoku University, Sendai, 980-8577 Japan