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For the purposes of a study of hadron component of an extended air shower (EAS), two detectors of cosmic rays (CR) were joined at the Baksan Neutrino Observatory. They are an EAS array detector (the "Carpet") and a neutron monitor (NM). Due to the versatility of a new recording system a master-pulse, which comes from the "Carpet" and marks to occurring of EAS, is joined to NM data. After processing of the huge data set it is found that the time of EAS influence on NM is less than 1 ms. The distribution of time intervals between pulses in the first millisecond after EAS onset is essentially different from the background and shows presence of two processes with characteristic times 45 and 230 µs. [ABSTRACT FROM AUTHOR]

Based on a huge data set acquired with a unique recording system, multiplicity events M = 4 - 50 on a neutron monitor have been analyzed in detail. The multiplicity events are recorded in detail for the first time, their structure being examined. The multiplicity processes in a neutron monitor have been numerically simulated by a toolkit GEANT4. Analysis of neutron monitor data with high temporal and spatial resolution reveals that most multiplicity events involving more than three adjacent counter tubes are due to local hadronic air showers with characteristic dimensions of size 1 - 3 m and duration of ~ 1 ms. [ABSTRACT FROM AUTHOR]

The characteristics of hadrons with Eh > 50 MeV in EAS have been obtained. The measurements were performed at the CARPET-2 extensive air shower array. For showers with E0 > 6 ⋅ 1013 eV the duration of hadronic cascade in NM has been estimated. The dependence of the mean neutron multiplicity in the neutron monitor on the total number of the change particles for EAS with Ne = 105 - 107 at a distance of 17 - 30 m from EAS axis has been measured. [ABSTRACT FROM AUTHOR]

The characteristics of hadrons with Eh > 50 MeV in EAS have been obtained. The measurements were performed at the CARPET-2 extensive air shower array. For showers with E0 > 6 ⋅ 1013 eV the duration of hadronic cascade in NM has been estimated. The dependence of the mean neutron multiplicity in the neutron monitor on the total number of the change particles for EAS with Ne = 105 - 107 at a distance of 17 - 30 m from EAS axis has been measured. [ABSTRACT FROM AUTHOR]