宇宙线质量测量简述

he origin and propagation of the cosmic ray is one of the basic issues in thecosmic ray research today. Studying the mass composition and energy spectrum of cosmic rayin the knee is one of the ways to solve this basic problem. The measurements of the cosmicray in the knee can only be achieved on the ground-based experiments by measuring theextensive air showers (EAS) caused by cosmic rays in the atmosphere. Compared with space#2;based experiments, ground-based experiments are facing challenges such as poor componentidentification ability and energy reconstruction errors. The measurement methods, resultsand difficulties faced in the ground-based cosmic ray experiments at home and abroad aresummarized. Besides, the outlook for the LHAASO experiment in mass measurements ofthe cosmic ray is also given.