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报道了３０ＭｅＶ／ｕ４０Ａｒ＋１５９Ｔｂ反应中中等质量碎片发射时间随空间大小的演化规律。实验结果表明，发射空间大小对ＩＭＦ关联函数的影响主要来自于发射源的核物质密度，而几乎不依赖于源的质量数，对于发射时间较短（≤１００ｆｍ／ｃ）的高能碎片，较小的核物质密度导致提取的发射时间变小．在正常核物质密度参数下提取的发射时间可作为其上限值，对于发射时间较长的中低能碎片，发射时间不随空间大小变化，提取的发射时间值即为其实际值。
The evolution of medium mass fragment emission time with space in the 30MeV / u40Ar + 159Tb reaction was reported. The experimental results show that the influence of emission space size on the IMF correlation function mainly comes from the density of the nuclear material of the emitter and almost does not depend on the mass of the source. For the high-energy fragments with shorter emission time (≤100fm / c) The density of the nuclear material led to the extraction of emission time becomes smaller. The emission time extracted under the normal nuclear material density parameter can be used as the upper limit value. For the middle-low energy fragments with longer emission time, the emission time does not change with the space size, and the extracted emission time value is the actual value.