| Affiliation: | (1) Department of Physics, Osaka University, Osaka 560-0043, Japan;(2) Institute of Physics, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan;(3) College of Science, Rikkyo University, Toshima-ku, Tokyo 171-8501, Japan;(4) Kochi University of Technology, Tosayamada, Kochi 782-8502, Japan;(5) Department of Physics, Niigata University, Niigata 950-2181, Japan;(6) Present address: RIKEN, Wako, Saitama 351-0198, Japan;(7) TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C., Canada, V6T2A3;(8) Department of Physics, Saitama University, Saitama 338-8570, Japan;(9) Argonne Natsional Laboratory, Argonne, IL 60439, USA;(10) Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA |
