多中子探测谱仪原型机研制及宇宙线测试

Construction and Cosmic Ray Test of Prototype of Advanced Multi-neutron Detection Array

摘要: 利用丰中子放射性核束和大型中子探测设备探索中子滴线区原子核的奇特结构是目前核物理研究的前沿热点之一，计划发展高分辨、高效率的先进多中子探测谱仪，以开展相关研究。基于BC408塑料闪烁体和SiPM，搭建了包含4个探测单元的原型探测阵列，利用宇宙线对该探测阵列进行了性能测试，得到时间分辨167 ps，位置分辨1.69 cm，并确定了衰减长度等重要性能参数，达到较好水平，为多中子探测谱仪建设提供了技术验证。

Abstract: Study of the exotic structure of nuclei in the neutron drip line region using radioactive ion beams and large neutron detector arrays is one of the current frontiers of nuclear physics research. As a key equipment for this study, the Advanced Multi-neutron Detection Array (AMDA) with high resolution and high efficiency is now under development. A prototype array has been built, which is composed of four test units each consisting of the BC408 plastic scintillator and SiPM. Its performance has been evaluated in the cosmic ray irradiation test. A time resolution of 167 ps and a position resolution of 1.69 cm were obtained, and the attenuation length was also determined. The good performance of the prototype has been demonstrated, which validates the technical design of AMDA.