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<title>30th International Cosmic Ray Conference</title>
<description>The 30th International Cosmic Ray Conference will be held from July 3, 2007 to July 11, 2007 in Merida, Yucatan, Mexico.</description>
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<startDate>2007-07-03T08:00:00</startDate>
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 <title>Lateral Distribution Functions for the Energy Estimation of UHECR Protons</title>
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 <startDate>2007-07-04T14:45:00</startDate>
 <endDate>2007-07-04T14:45:00</endDate>
 <abstract>The energy is among the characteristics of Ultra High Energy Cosmic Rays 
(E&gt;5 x 1019 eV) which could be estimated experimentally. The following paper 
attempts to estimate the energy of an UHECR proton by applying a Monte Carlo 
simulation code. A number of extensive air showers, vertical and inclined, 
is simulated to derive the Lateral Distribution Functions of the shower muons.
The scenario of simulations is adopted to the Cerenkov surface detector of the 
P. AUGER Observatory. 
Due to the fact that the Lateral Distribution Functions show minimal fluctuations 
of the muon density at a distance larger than 800 m from the core of the 
showers, 
and due to the fact that at a distance of 900 m the distribution functions for 
inclined showers coincide (which means that it does not change with the zenith 
angle of the showers), we select the muon density at 900 m to derive 
the energy of the primary protons. 

(The project is co-funded by the European Social Fund and National 
Resources (EPEAEK II) PYTHAGORAS II.)</abstract>
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