Affiliation: | 1. Institute of Physics, University of Tsukuba, Tsukuba-shi, 305, Ibaraki, Japan 3. Institute for Nuclear Study (INS), University of Tokyo, Midori-cho 3-2-1, Tanashi-shi, 188, Tokyo, Japan 4. The Institute of Physical and Chemical Research (RIKEN), Hirosawa 2-1, Wako-shi, 351-01, Saitama, Japan 5. Japan Atomic Energy Research Institute (JAERI), Tokai-mura, Naka-kun, 319, Ibaraki, Japan
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