To study muon bundles in a wide range of zenith angles and multiplicities using the NEVOD and DECOR detectors at the Scientific and Educational Center NEVOD (MEPhI, Moscow), the method of local muon density spectra (LMDS) is used. This method for estimation of the primary particle energy has rather low accuracy (σ(lgE0) ~ 0.4) due to the contribution of extensive air showers (EAS) with different energies detected at different distances from their axes to the events with fixed local muon density. A new NEVOD-EAS array which is being created in MEPhI will allow to increase the accuracy of the LMDS technique by supplementing the information on muon component with data on the EAS axis position and to calibrate this method by comparing the energy spectra of cosmic rays obtained by simultaneous registration of the same events by muon bundles and EAS electron-photon component. The array consists of clusters of scintillation counters deployed around the NEVOD-DECOR complex. The cluster of the array is an independent EAS detector that is capable to determine the number of particles registered by its counters and the air-shower arrival direction.
The methods for the EAS reconstruction according to the data of the NEVOD-EAS cluster type array are described and the obtained results are presented.