Abstract
Observation of high-energy cosmic rays by very inclined muon bundles in the NEVOD-DECOR experiment
Highlights
EAS are detected at the ground as a practically pure muon component
Near 1017 eV, a hint for a second knee was found: partial fits of the data at 65◦ below and above this energy show an increase of the integral local muon density spectra (LMDS) slope, β, by 0.20 ± 0.09
Under certain assumptions about primary mass composition and hadron interaction model, LMDS may be converted into estimates of the primary cosmic ray spectrum [7] and directly compared with other measurements of the primary energy spectrum
Summary
In 2005, the upper supermodules were re-assembled, equipped with a newly developed fast electronics, and a wideaperture muon hodoscope URAGAN [6] with an area c The Authors, published by EDP Sciences. The set of the hardware event selection conditions based on the coincidences of the signals from different parts of the coordinate detector and signals formed by the NEVOD triggering system was kept unchanged during the measurements. The selection procedure included several stages: trigger condition of the coincidence of the signals from at least three DECOR supermodules; off-line track reconstruction and soft program selection of muon bundle candidates containing a required minimal number of quasi-parallel tracks; final event classification and track counting by the operators. As is seen from the plots, the obtained data on muon bundles cover about six orders of magnitude in the event intensity
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