Author :
Tokuda, N. ; Yonehara, H. ; Noda, A. ; Watanabe, S. ; Yoshizawa, M. ; Takahashi, N. ; Takanaka, M. ; Chida, K. ; Mizobuchi, A. ; Nakanishi, T. ; Katayama, T.
Author_Institution :
Institute for Nuclear Study, University of Tokyo Tanashi, Tokyo 188, Japan