一个适用于裂变关联实验的孪生屏栅电离室

A TWIN GRID ION CHAMBER SUITABLE FOR FISSION CORRELATION EXPERIMENT

设计制作了一个适用于裂变多参量关联实验的孪生屏栅电离室,用^(252)Cf转移裂变源分别研究了以氩-甲烷混合气体和纯甲烷为工作气体时探测器的性能。结果表明,探测裂变碎块时电离室的能量分辨不劣于金硅面垒探测器;从栅极信号确定碎片发射角的cosθ值时的分辨(FWHM)约为0.03。具有相同形状的快上升前沿波形的阴极输出信号,可作为多参量关联实验中的时间标志。

A twin grid ion chamber suitable for fission multi-parameter correlation experiment is designed and developed. Its behaviour is studied using a ^(252)Cf transfer fissile source on a stainless steel backing in the case when Ar (90%)+CH_4 (10%) mixture gas and pure CH_4 gas are selected as working gases. The ratio of the number of counts per channel at the peak of light fragment group to that at the minimum in the valley is about 2.8, this means that the energy resolution of detecting fission fragments is not worse than that of the barrier type detector. The cosθ of the fragment emission angle can be determined with a resolution in cosθ of 0. 03. Because of the constant fast rising leading edge, the cathode signals can be used as timing mark in the multi-parameter correlation experiments.