T.Ichihara1,M.Ishihara1,2,H.Ohnuma3,T.Niizeki3, Y.Tajima3,T.Yamamoto3,Y.Fuchi4,S.Kubono4,M.H.Tanaka4, H.Okamura2,S.Ishida2,S.Miyamoto5,H.Toyokawa6 Inst.of Physical and Chemical Res. (RIKEN1 Univ. of Tokyo, Tokyo2 Tokyo Inst.of Technology, Tokyo3 Institute for Nuclear Study, Univ. of Tokyo, Tanashi4 Tohoku Univ., Sendai5 Osaka Univ., Osaka6
Physics Letters,Section B323(1994)278