Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1..413s&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
1
Scientific paper
The High Resolution Fly's Eye Detector (HiRes) detects and measures properties of ultra high energy cosmic rays (UHECR). The HiRes detector exploits the air fluorescence technique that uses the atmosphere as a calorimeter. A brief description of this technique and how it is used by the HiRes detector will be given in this paper. The HiRes detector has been operational with two detector sites separated by 12.6 km since the fall of 1999. The two separated "eyes" enable the HiRes detector to obtain stereoscopic observations of the air showers. We also have a data set obtained with the first of the 2 sites from a total of 4.0 years of observations in mono cular mode. Preliminary results from both the mono cular and stereo analysis will be described. Introduction The dependence of the flux of cosmic rays on energy is roughly described by a power law, f lux = E -n , where the spectral index, n, is approximately 3. Structure in the energy spectrum is manifested by changes in the spectral index. The energy spectrum of ultra-high energy cosmic rays is expected to be cut off above an energy of 60 EeV[1][2]. The first generation Fly's Eye detector, however, observed a cosmic ray particle whose energy was measured to be 320 EeV [3]. The AGASA air shower array has observed several events whose energies were above 60 EeV [4].Many interesting theoretical explanations for the existence of purported "sup er-GZK" particles have been proposed. The HiRes detector utilizes the air fluorescence technique[5 ]. This technique uses the atmosphere as a calorimeter to measure the energy of cosmic ray particles. The initial primary particle interacts with atoms in the atmosphere and produces a cascade of secondary particles. As the secondary shower particles pass through the atmosphere they excite nitrogen atoms in the atmosphere that emit ultraviolet photons through fluorescence [6]. The longitudinal development of the air shower can be determined by measuring the amount of UV light produced by
HiRes Collaboration
Springer Robert Wayne
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