What%20a%20cosmic%20ray%20(CR)%20and%20a%20ultra%20high%20energy%20cosmic%20ray%20(UHECR)%20are?

1
The Pierre Auger Observatory for the
UHECRFederico Sanchez, Dip.Fisica e INFN sezione
Milano

• What a cosmic ray (CR) and a ultra high energy
  cosmic ray (UHECR) are?
• What do we know and what we would like to know
  about them?
• How do we detect them?
• First Auger public results and conclusions

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A cosmic ray is not a ray...
What
subatomic primaries (e, p, He, C, N, O ,
Fe) and secondaries particles (Li, Be, B) from
our galaxy.
EAS regime
Direct observation regime
How and where
Produced by diffusive shock acceleration in SNR
(super novae remnants)
? ? ?
3
B source
n
CR
B intergalactic
Nucleons
n
Relic
g
How far?
Nucleons
B galactic
g
X particle
B halo
4
Gaucho
5
HYB
SD
Spectrum
FD
6
Conclusions

• The Pierre Auger Observatory started regular
  data taking in January 2004 and released its
  firsts physics results in August 2005.
• The southern site construction will finish by
  the end of 2006.
• The northern site is in RD phase.

Thank you,