Abstract
Using a new device for extensive air shower core localization consisting of four sets of Conversi neon detectors of total area 9 m2 (comprising 36000 neon tubes), cores have been located with high accuracy and the lateral muon distribution and density have been measured for a threshold energy of 0.6 GeV. The interpretation of the shape of this distribution is discussed and compared with theoretical calculations. As the muon lateral distribution is mainly determined by the angles of emission of parent pions, some features of the distribution of transverse momenta pt of pions produced in air can be analysed. For low pt values a discrepancy is found with the Cocconi empirical pt distribution which comes from accelerator data. A flattening of the muons' lateral distribution near the shower axis is interpreted as being due to a lack of small pt values.
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