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U. Gatg, et al., Phys. Rev., C9(1979),217.[2] 郭应祥等,高能物理与核物理,14(1990),635.[3] J.Hattula.. et al., J. Phys., G13(1987),57.[4] Y.Liang, et al., Phys. Rev, C42(1990),890.[5] M.S. Rouabah, et al., Z. Phys., A328(1987),493.