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Properties of Ultra High Energy Cosmic Rays

Properties of Ultra High Energy Cosmic Rays from The Pierre Auger Observatory. James W. Cronin Blois 2009. 1. 10 20 eV proton 16 joules energy

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Properties of Ultra High Energy Cosmic Rays

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  1. Properties of Ultra High Energy Cosmic Rays from The Pierre Auger Observatory James W. Cronin Blois 2009 1

  2. 1020 eV proton 16 joules energy Kinetic energy of Roger Federer’s second serve But momentum of a snail Macroscopic energy in a microscopic particle No known astrophysical sources “seem” able to produce such enormous energies 1/ km2/ century 3000 km2 -> 30 events / year Simon Swordy University of Chicago

  3. proton + cmb ->  + nucleon 3

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

  5. High energy spectrum circa 2004

  6. Portugal Netherlands gm/cm2

  7. l l l l l l l 0 2  sec 4 6

  8. 32 stations ~ 80 EeV Zenith= 720 Event 762577 Energy ≈8x1019 eV by inclined shower algorithm 0 2  sec 4 6 |||||||||||||||||||||||| 10

  9. Fluorescence Detector Fluorescence telescopes: Number of telescopes: 24 Mirrors: 3.6 m x 3.6 m with field of view 30º x 30º, each telescope is equipped with 440 photomultipliers.

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

  11. 20 May 2007 E ~ 1019 eV

  12. Spectrum Victor Olmos-Gilbaja Santiago Wednesday 16:00 - 16:15 Room : Gaston d’Orleans

  13. Exposure ~ 17000 km2-yr 2.3 x PRL Zenith angle ≤ 600

  14. The High Energy Sky Edivaldo Santos Rio de Janeiro Carla Bonafazi Paris Wednesday 14:20 - 14:55 Room: Gaston d’Orleans

  15. ~20 events/year ->

  16. I

  17. Elongation Rate Victor de Souza San Carlos Brasil Wednesday 15:20 15:35 Room: Gaston d’Orleans

  18. Note: These data are all below 55 EeV

  19. Photon limit Mariangela Settimo Lecce Wednesday 16:40 - 16:55 Room Gaston d’Orleans

  20. Neutrino Limit Sergio Navas Granada Wednesday 18:40 - 18:55 Room: Gaston d’Orleans

  21. END

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