Stereo Spectrum of UHECR Showers at the HiRes Detector

Details Stereo Spectrum of UHECR Showers at the HiRes Detector Stereo Spectrum of UHECR Showers at the HiRes Detector

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....1..409s&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

Scientific paper

We present a measurement of the energy spectrum of UHECR showers. This measurement uses the two HiRes detector sites separated by 12.6 km to perform stereoscopic observations of UHECR air showers. The technique of stereoscopic reconstruction of the shower geometry and longitudinal profile is described. The resolution of reconstructed shower parameters using these techniques has been estimated using a detector simulation. Using the indep endently measured shower profiles from each detector site the energy resolution has also been measured. The detector aperture has been estimated by using the detector simulation. The energy distribution and resultant energy spectrum will be shown. Introduction A brief description of the background information describing the physics of UHECR as well as the air fluorescence technique can be found in the HiRes summary paper [3] submitted to this conference. A slightly more detailed description of the HiRes detector as well as references to the other papers submitted by the HiRes collab oration may also be found there. This article will fo cus on describing the techniques and benefits of the stereoscopic measurement. Stereo Detector Requirements and Description The stereoscopic HiRes detector needs to maintain a large aperture to have a sensitivity to fluxes at and beyond the GZK cutoff energy. The flux of particles at energies above EGZ K = 6 × 1019 eV is such that an aperture of approximately 10,000 k m2 steradian is required to either detect or rule out the existence of particles with energies in excess of the GZK cutoff. It should be noted that for lower energies, the stereoscopic aperture is less than the corresponding mono cular aperture due to the requirement that the air shower be seen by both detectors. The aperture for stereoscopic reconstruction rapidly falls to zero for energies less than 1017.8 eV.

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