Results from the High Resolution Fly's Eye Experiment

Journal Article · Thu Sep 22 04:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3628706· OSTI ID:21608333

Jui, C C. H. ^[1]

---

1. Department of Physics, University of Utah, 115 S. 1400 E. Rm. 201 Salt Lake City, Utah, 84112-0830 (United States)

The High Resolution Fly's Eye (HiRes) Experiment operated two fluorescence detector sites in the western Utah desert between 1997 and 2006. The HiRes results on the cosmic ray spectrum are consistent with the GZK Suppression predicted at 10{sup 19.8} eV and observe an ankle structure at 10{sup 18.5} eV. These spectral features are consistent with a proton-dominated composition for cosmic rays at the highest energies. The HiRes composition studies of both the mean and the variance of the shower maximum depth (X{sub max}) also give results that are completely consistent with a predominately protonic composition, and inconsistent with heavy nuclei such as iron. We also report on the result of anisotropy studies.

• OSTI ID: 21608333
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1367; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
ASTROPHYSICS
BARYONS
COSMIC NUCLEI
COSMIC PROTONS
COSMIC RADIATION
COSMIC RAY DETECTION
COSMIC SHOWERS
DETECTION
EEV RANGE
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
EMISSION
ENERGY RANGE
ENERGY SPECTRA
EVEN-EVEN NUCLEI
FERMIONS
FLUORESCENCE
HADRONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
IRON 56
IRON ISOTOPES
ISOTOPES
LUMINESCENCE
MEASURING INSTRUMENTS
MULTIPARTICLE SPECTROMETERS
NUCLEI
NUCLEONS
PARTICLE IDENTIFICATION
PHOTON EMISSION
PHYSICS
PRIMARY COSMIC RADIATION
PROTONS
RADIATION DETECTION
RADIATIONS
RED SHIFT
RESOLUTION
SECONDARY COSMIC RADIATION
SHOWERS
SPECTRA
SPECTROMETERS
STABLE ISOTOPES
ULTRAVIOLET RADIATION