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报道了 ３０ＭｅＶ／ ｕ(４０)Ａｒ＋(ｎａｔ)Ａｇ反应中中等质量碎片（ＩＭＦ）发射时间（τ）随发射源空间大小的演化规律，并对类弹碎片的发射时空进行了讨论．结果表明，ＩＭＦ的发射时标与中等质量碎片关联函数以及发射源的核物质密度（ρ）有关，而与发射源的质量数的关系不大．对于能量较高的类弹碎片来说，在较小的核物质密度下提取的发射时间也较小，因此，在正常核物质密度参数下提取出的发射时间值可作为碎片实际发射时间的上限值．中速碎片的发射时间随密度大小的变化非常缓慢，提取出的发射时间值即可作为实际的发射时间。
The evolution of the IMF emission time (τ) in the 30MeV / u (40) Ar + (nat) Ag reaction with respect to the size of the emitter is reported, and the launch space-time of the bullet debris is discussed. The results show that the emission timing of IMF is related to the correlation function of medium-quality debris and the density of nuclear material (ρ) of the emitter, but not to the mass of the emitter. For energetic bullet fragments, the emission time at smaller nuclear material densities is also small, so the emission time value extracted under normal nuclear material density parameters can be used as the actual emission time of the fragments Limits. Medium-speed debris emission time changes with the density of the very slow, the extracted emission time value can be used as the actual launch time.