T.Motobayashi1, I.Yamane1, Y.Nogami1, N.Takahashi1, M.Hara1, K.Sagara1, M.Katoh1, H.Yamashita1, B.Imanishi2, 3 Univ. of Tokyo, Tokyo1 Institute for Nuclear Study, Univ. of Tokyo, Tanashi2 Inst.of Physical and Chemical Res. (RIKEN3
Physics Letters,Section B59(1975)421