Is the end in sight for ultrahigh energy cosmic rays uhecr
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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 l.jpg
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 l.jpg
Cosmic Ray Energy Spectrum (UHECR)?

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 l.jpg
Types of Experiment (UHECR)?

  • Air Flourescence

  • Fly’s Eye, HiRes, Utah

  • Ground Arrays

  • AGASA, Japan

  • Yakutsk, Siberia

Mark Pearce - KTH Stockholm -


Results from agasa l.jpg
Results From AGASA (UHECR)?

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 l.jpg

p (UHECR)?

Mark Pearce - KTH Stockholm -


The gzk greisen zatsepin kuzmin limit l.jpg
The (UHECR)?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 l.jpg
Ignoring AGASA... (UHECR)?

[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* Unpublished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 l.jpg
The Pierre (UHECR)?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 l.jpg
Journal Club Scoreboard (UHECR)?

Mark Pearce - KTH Stockholm -

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


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