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The Highest Energy Cosmic Rays I Propagation and Detection XXXIV ITEP Winter School of Physics Nucl Phys B

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. Cronin Moscow, February 25. Two techniques: • detect shower particles on the ground

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The Highest Energy Cosmic Rays I Propagation and Detection XXXIV ITEP Winter School of Physics Nucl Phys B

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  1. 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. Cronin Moscow, February 25

  2. Two techniques: • detect shower particles on the ground • detect air fluorescence produced by shower particles

  3. M Hillas 1984

  4. proton + cmb ->  + nucleon 3

  5. Assume E-2.5 spectrum

  6. Beyond 1500 gm/cm2 electromagnetic particles absorbed. (Highly inclined showers)

  7. 90 % of particles within Moliere radius of ≤ 100 m

  8. Note: total energy carried by muons ≤ 10%

  9. Energy deposit in 1.2 meters of water

  10. At 1000 meters from core

  11. Go to black board

  12. Two techniques: • detect shower particles on the ground • detect air fluorescence produced by shower particles

  13. A “perfect” hybrid event: few are as beautiful as this one ! Miguel Mostafa New Mexico/Utah

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