T.Suzuki1,M.Fukuda1,T.Ichihara1,N.Inabe1,T.Kubo1, T.Nakagawa1,K.Yoshida1,I.Tanihata1,T.Kobayashi2,T.Suda3, S.Shimoura4,M.Fujiwara5 Inst.of Physical and Chemical Res. (RIKEN1 High Energy Accelerator Res. Org. (KEK2 error3 Univ. of Tokyo, Tokyo4 Research Center for Nuclear Physics, Osaka Univ, Osaka5
Physics Letters,Section B257(1991)27