1. a Earth and Space Science , Osaka University , Machikaneyama-cho 1-1, Toyonaka, Osaka , 560-0043 , Japan Phone: Fax: E-mail:
2. b Earth and Space Science , Osaka University , Machikaneyama-cho 1-1, Toyonaka, Osaka , 560-0043 , Japan
3. c JASRI , SPring-8, Hyogo , 679-5198 , Japan
4. d JAERI , SPring-8, Hyogo , 679-5198 , Japan
5. e Earth Sciences , Ehime University , Matsuyama , 790-8577 , Japan
6. f PF , KEK , Tsukuba , 305-0801 , Japan