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F. D. Becchetti et al., Phys. Rev. Lett.,34(1975). 225.[2] F. D. Becchetti et al., Phys. Rev: Lett.; 35(1975), 268.[3] 任中洲、徐躬祸,高能物理与核物,12(1988),116.[4] Ren Zhongzhou, Xu Gongou, Phys. Rev., C38(1988), 1078.