基于地面粒子探测器阵列的一种新芯位重建方法  

A New Core Position Reconstruction Method Based on Ground Particle Detector Array

作　　者：郑应 何钰[1] 祝凤荣[1] 张丰 Zheng Ying;He Yu;Zhu Fengrong;Zhang Feng(School of Physics and Technology,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学物理科学与技术学院,四川成都611756

出　　处：《天文研究与技术》2023年第5期478-486,共9页Astronomical Research & Technology

基　　金：国家自然科学基金(11947404);四川省科技项目(2020SYSX0016);国家重点研发项目(2018YFA0404201)资助.

摘　　要：芯位重建是地面宇宙线探测实验开展物理分析的前提和基础。基于广延大气簇射(Extensive Air Shower,EAS)的对称性,结合探测器的特征,提出一种新的芯位重建算法——椭圆拟合法,用于模拟数据的芯位重建并与重心法对比。对于能量大于1 TeV的芯内宇宙线质子事例,芯位分辨率小于5 m,明显优于重心法;对于临近阵列边界20 m范围内能量大于1 TeV的事例,芯位分辨率小于10 m,与传统方法相比有显著优势。由于该方法能够在保证精度的前提下重建边沿事例和部分芯外事例,极大地增大了事例利用率,对于1~10 PeV质子事例的探测器阵列面积利用率比重心法增大1倍左右。Core position reconstruction is the prerequisite and basis for physical analysis of ground cosmic ray detection experiments.Based on the symmetry of the extensive air shower and the characteristics of the detector,this paper proposes a new core position reconstruction algorithm—ellipse fitting method,which is used to reconstruct the core position of simulated data and compare it with the center of gravity method.For the event of cosmic ray protons in the core with energy greater than 1 TeV,the core position resolution is less than 5 m,which is significantly better than the center of gravity method;for the event with energy greater than 1 TeV within a range of 20 m near the array boundary,the core position resolution is less than 10 m.It has significant advantages over traditional methods.Because this method can reconstruct edge events and some out-of-core events under the premise of ensuring accuracy,the utilization rate of the events is greatly increased.For the 1-10 PeV proton event,the area utilization rate of the detector array is about twice that of the center of gravity method.

关 键 词：宇宙线 广延大气簇射 事例重建 对称性 水切伦科夫阵列 

分 类 号：TN216[电子电信—物理电子学]