Indications of Proton-Dominated Cosmic Ray Composition above 1.6 EeV - INSPIRE

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Indications of Proton-Dominated Cosmic Ray Composition above 1.6 EeV

HiRes

Collaboration

•

R.U. Abbasi
(
- Utah U.
)

Oct, 2009

11 pages

Published in:

Phys.Rev.Lett. 104 (2010) 161101

e-Print:

0910.4184 [astro-ph.HE]

DOI:

10.1103/PhysRevLett.104.161101

Experiments:

HIRES

View in:

ADS Abstract Service

reference search382 citations

Citations per year

Abstract: (arXiv)

We report studies of ultra-high energy cosmic ray composition via analysis of depth of airshower maximum (Xmax), for airshower events collected by the High Resolution Fly's Eye (HiRes) observatory. The HiRes data are consistent with a constant elongation rate d/d(log(E)) of 47.9 +- 6.0 (stat.) +- 3.2 (syst.)g/cm^2/decade for energies between 1.6 EeV and 63 EeV, and are consistent with a predominantly protonic composition of cosmic rays when interpreted via the QGSJET01 and QGSJET-II high-energy hadronic interaction models. These measurements constrain models in which the galactic-to-extragalactic transition is the cause of the energy spectrum 'ankle' at 4 EeV.

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References(22)

Figures(4)

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)

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HiRes

Collaboration

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)

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HiRes

Collaboration

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)

et al.

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•
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HiRes

Collaboration

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et al.

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•
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FLASH

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(
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,
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(
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,
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HiRes

Collaboration

•

R.U. Abbasi
(
- Utah U.
)

et al.

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•
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•
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HiRes

Collaboration

•

P.A Sadowski
(
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)

et al.

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•
DOI:
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Measurement of the Depth of Maximum of Extensive Air Showers above $10^{18}$ eV

Pierre Auger

Collaboration

•

J. Abraham
(
- Buenos Aires, CONICET
)

et al.

- Phys.Rev.Lett. 104 (2010) 091101
•
e-Print:
- 1002.0699
•
DOI:
- 10.1103/PhysRevLett.104.091101