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用四参量关联实验技术研究了２５２Ｃｆ冷裂变瞬发γ射线发射性质。孪生屏栅电离室收集极和栅极信号分别用于确定碎片的动能和发射角。圆柱形电离室轴线上的ＮａＩ（Ｔ１）晶体用于符合记录裂变瞬发γ射线．结果表明，不仅冷裂变瞬发γ射线角分布系数约为正常二分裂变值的两倍，而且冷裂变轻碎片发射的γ射线数目几乎是重碎片发射数目的三倍．对后一实验事实目前尚未有满意的理论解释．
The emission properties of 252Cf cold fission instantaneous γ-ray were studied by four-parameter correlation experiment. The twin grid ionization chamber collector and gate signals are used to determine the kinetic energy and emission angle of the fragments, respectively. NaI (Tl) crystals on the axis of the cylindrical ionization chamber are used to coincide with recording fission instant gamma rays. The results show that not only the instantaneous γ-ray angular distribution coefficient of cold fission is about double the normal fission, but the number of γ-rays emitted by the cold fissile fragments is almost three times of that of the heavy fragments. There is no satisfactory theoretical explanation for the latter experimental fact.