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Is the End in Sight for Ultrahigh Energy Cosmic Rays (UHECR)?. S. Sakir: [ http://physicsweb.org/article/world/15/9/3 ] J. Bahcall + E. Waxman: [ hep-ph/0206217 v3 ]. Mark Pearce September 3 rd 2002. Cosmic Ray Energy Spectrum. Balloons and Satellites. Cosmic ray astronomy?

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is the end in sight for ultrahigh energy cosmic rays uhecr
Is the End in Sight for Ultrahigh Energy Cosmic Rays (UHECR)?

S. Sakir: [http://physicsweb.org/article/world/15/9/3]

J. Bahcall + E. Waxman: [hep-ph/0206217 v3]

Mark Pearce

September 3rd 2002

Mark Pearce - KTH Stockholm -

cosmic ray energy spectrum
Cosmic Ray Energy Spectrum

Balloons and Satellites

  • Cosmic ray astronomy?
  • Galactic magnetic field = mG
  • CR with energies > ~1018 GeV should point back to source

LHC

LEP

UHECR

Mark Pearce - KTH Stockholm -

types of experiment
Types of Experiment
  • Air Flourescence
  • Fly’s Eye, HiRes, Utah
  • Ground Arrays
  • AGASA, Japan
  • Yakutsk, Siberia

Mark Pearce - KTH Stockholm -

results from agasa
Results From AGASA

One idea: slow decay of relic supermassive [O(1012) GeV] dark matter particles, ’cryptons’.

AGASA

Spectrum expected from uniform distribution of cosmologically distant sources

Mark Pearce - KTH Stockholm -

slide5
p

Mark Pearce - KTH Stockholm -

the gzk greisen zatsepin kuzmin limit
The GZK (Greisen Zatsepin Kuzmin) Limit
  • When this process is energetically allowed (~ 5 x 1019 eV), space becomes opaque to cosmic rays
  • CR with energies above the GZK limit must be ’close’, < 100 Mpc
  • ie: within the well known local galactic cluster...
  • No known acceleration sites for such high energies...

Mark Pearce - KTH Stockholm -

ignoring agasa
Ignoring AGASA...

[AGASA (exposure >1020 eV  1.3 103 km2 yr sr)]

Yakutsk (0.9)

Fly’s Eye (0.9)

No GZK cut-off

*HiRes (2.2)

Galactic cosmic rays

Cosmologically distance gamma-ray burst model (hep-ph/0206217)

* Unpublished

Mark Pearce - KTH Stockholm -

 No exotic processes needed!

1020 eV

the pierre auger observatory
The Pierre Auger Observatory
  • Auger will combine combine air fluorescence with ground arrays cross-calibration
  • Mendoza site: 1600 x 10k litre Cerenkov detectors / 30 air flourescence / 3000 km2 / 1.5km pitch
  • First results recorded from an engineering set-up last year. Full set-up by end 2004.

Mark Pearce - KTH Stockholm -

  • Auger should settle the issue once and for all...
journal club scoreboard
Journal Club Scoreboard

Mark Pearce - KTH Stockholm -

NB: Present 2 / attend 6 / 2 pages your own / 4 x 1 page on others

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