The Highest Energy Cosmic Rays I Propagation and Detection XXXIV ITEP Winter School of Physics Nucl...
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The Highest Energy Cosmic Rays
I Propagation and Detection
XXXIV ITEP Winter School of Physics
Nucl Phys B (Proc Suppl) 138 (2005) 465-491
James W. CroninMoscow, February 25
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Two techniques:
• detect shower particles on the ground
• detect air fluorescence produced by shower particles
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M Hillas
1984
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3
proton + cmb -> + nucleon
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Assume E-2.5 spectrum
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Beyond 1500 gm/cm2
electromagnetic particlesabsorbed. (Highly inclined showers)
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90 % of particleswithin Moliereradius of ≤ 100 m
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Note: total energycarried by muons ≤ 10%
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Energy deposit in1.2 meters of water
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At 1000 meters from core
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Go to black board
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Two techniques:
• detect shower particles on the ground
• detect air fluorescence produced by shower particles
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A “perfect” hybrid event: few are as beautiful as this one !
Miguel MostafaNew Mexico/Utah
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To be continued