Moscow International School of Physics

The new coordinate-tracking detector based on drift chambers to investigate muon bundles produced by ultra-high energy primary cosmic rays is being developed. The project is aimed to solve a problem of excess of muon bundles events, which increases with energies of primary particles. The reasons can be in cosmo-physical or nuclear-physical processes. Today the prototype of the detector is developed, which was called coordinate-tracking unit based on drift chambers (CTUDC). CTUDC consists of 16 multiware drift chambers with effective square 1.85 m2. The detector allows investigate muon bundles with density up to 10 particles/m2 and more at zenith angles up to 90°. The report summarizes the results of analysis of muon bundles events, registrated by CTUDC.