J. C. van der Velde

Measurement of the cosmic-ray energy spectrum and composition from 1017 to 1018.3 eV using a hybrid technique

We study the spectrum and average mass composition of cosmic rays with primary energies between 10^{17} eV and 10^{18} eV using a hybrid detector consisting of the High Resolution Flys Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum as a function of energy. A complete Monte Carlo simulation of the detector response and comparisons with shower simulations leads to the conclusion that the cosmic ray intensity is changing f rom a heavier to a lighter composition in this energy range. The spectrum is consistent with earlier Flys Eye measurements and supports the previously found steepening near 4 \times 10^{17} eV .

Evidence for Changing of Cosmic Ray Composition between 10**17-eV and 10**18-eV from Multicomponent Measurements

The average mass composition of cosmic rays with primary energies between

The cosmic ray energy spectrum between 1014 and 1016 eV

10^{17}

A large air shower array to search for astrophysical sources emitting γ-rays with energies ≥1014 eV

eV and

Limits on the Isotropic Diffuse Flux of Ultrahigh Energy {gamma} Radiation

10^{18}

The cosmic ray composition between 1014 and 1016 eV

eV has been studied using a hybrid detector consisting of the High Resolution Flys Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum,

Constraints on Gamma-ray Emission from the Galactic Plane at 300 TeV

X_{max}

Limits on the flux of energetic neutrinos from the sun

, and in the change in the muon density at a fixed core location,

IMB-3: a large water Cherenkov detector for nucleon decay and neutrino interactions

\rho_\mu(600m)

Search for diffuse cosmic gamma rays above 200 TeV

, as a function of energy. The composition has also been evaluated in terms of the combination of