利用GEM读出的时间投影室对快中子诱发裂变产物多参数测量的研究

关于原子核裂变产物的实验研究能够深入的探索核裂变过程的量子特性，但多参数的关联测量相对缺乏。本项目拟利用基于GEM读出的fission TPC(fission time projection chamber)，通过快中子诱发探测器内部的靶物质裂变，并对其碎片进行多参量的全径迹高精度测量，同时添加辅助的缓发γ探测器符合测量裂变碎片的缓发γ射线,进而进行目标碎片的核素鉴别。该系统具体4π的立体角覆盖、高探测效率和高精度的空间分辨等特性。本项目的实施将是国内首次对快中子诱发的裂变碎片的单事件全举性多参数实验测量，不仅在实验上发展了先进的核裂变产物探测技术,还将促进大质量原子核极端形变的理论研究工作。

The experimental study of the nuclear fission products offers an opportunity of deeper exploration of the quantum features in the fission process. Meanwhile, measurements with multi correlated parameters are rear, In this proposal, employing a GEM-based fission Time Projection Chamber (TPC), all the fragments of a fast-neutron induced fission inside the detector are measured in precision and with multi parameters. Furthermore, with a pair of additional γ detectors for the delayed γ ray of the fission fragments, the isotopes of the corresponding fission fragments are identified. Owning a nearly 4π coverage of the solid angle, this detector system offers several advantages such as high efficiency and high spatial resolution. The accomplishment of this proposal would be the first multi-parameter exclusive measurement of the neutron induced fission fragments at event level in China. Not only will this proposal develop the advanced detecting techniques for the fission products in experiment, but also stimulate the theoretical research of the extremely deformed nuclei with a large mass.