Y.Yoshizawa1, H.Noma1, T.Horiguchi1, T.Katoh2, S.Amemiya2, M.Itoh2, K.Hisatake3, M.Sekikawa3, K.Chida4 Hiroshima Univ., Hiroshima and Higashi-Hiroshima1 Nagoya Univ., Nagoya2 Tokyo Inst.of Technology, Tokyo3 Institute for Nuclear Study, Univ. of Tokyo, Tanashi4
Nuclear Instrum.and Methods in Physics Res.134(1976)93