Study of neutron many-body system via reaction of unstable nuclei

研究了放热电荷交换产生富中子核和多中子系统的过程，以了解多中子系统的动力学。研制了用于高分辨率磁谱仪（SHARAQ）和束流线的跟踪探测器，以及两个重合粒子的智能探测系统。通过放热电荷交换反应证明了高激发态的居群，通过双电荷交换反应证明了轻中子富核的居群，为计划于2012年初进行的四中子系统实验奠定了基础。

Process of exothermic charge exchange producing neutron-rich nuclei and multi-neutron system was investigated for understanding dynamics of multi-neutron system. Tracking detectors for high-resolution magnetic spectrometer(SHARAQ) and beam-line were developed as well as an intelligent detection system for two coincident alpha particles. Populations of highly excited states via an exothermic charge exchange reaction and of light neutron-rich nuclei via double charge exchange reaction were demonstrated, which is a basis for the experiment of tetra-neutron system scheduled in early 2012.