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Updated: Jun 12, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Indications of proton-dominated cosmic-ray composition above 1.6 EeV
R U Abbasi1, T Abu-Zayyad, M Al-Seady
1Department of Physics, University of Utah, Salt Lake City, Utah, USA.
Abstract:
We report studies of ultrahigh-energy cosmic-ray composition via analysis of depth of air shower maximum (X(max)), for air shower events collected by the High-Resolution Fly's Eye (HiRes) observatory. The HiRes data are consistent with a constant elongation rate d
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