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Abstract:
We investigate the relation of the muon charge excess with the nature of the
primary, according to isospin conservation and charge exchange mechanism in the
earliest interactions.
The opportunity to associate a negative charge excess to neutron primaries
above 100TeV could be used in astrophysics for close sources, like the Loops or
Geminga.
The selection of events with zenithal and azimutal incidences favouring the
maximal deflection by the geomagnetic field suggests some new criteria to
discriminate proton and heavy nuclei in the "knee" region.
We explore also the chance to observe in muon target diagram the properties
of alignement of UHE events seen in emulsion chambers near 10^7 GeV.
At energies larger than the LHC, we present finally some lateral distribution
of high energy muons carried out with CORSIKA, using for extrapolation of
multiproduction at UHE the Quark Gluon String Model.
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