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