ИСТИНА

There are two ways to describe multiplicity generation in a neutron monitor (NM). The first one could be called “single particle origin”. It is based on the suggestion that a single very high energetic particle (nucleon) produces a great many (up to thousands) secondary neutrons in the lead shield of NM. It is conventional viewpoint on multiplicity. The second one could be called “shower origin”. It based on the assumption that a shower of energetic particles covers NM. Due to out fast recording system developed in Polar Geophysical Institute fine temporal and spatial structures of multiplicity can be study. These structures modify fluently along multiplicity number M growth, but differences between M < 10 and M > 30 become already significant. And fine structures of large multiplicity (M > 30) conform to the shower origin. This result is carried out from four NMs. Multiplicity structures on Barentsburg NM with having original design give clear and unambiguously answer: multiplicity M > 40 can be only generated by the shower.