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    |    Particle Physics Seminar		     |
    |    Thursday, June 15, 2000 - 11:00 AM	     |
    |    Small Seminar Room			     |
    |						     |
    |	 Wayne Springer, Utah			     |
    |	 The Observation of Ultra-High Energy Cosmic |
    |	 Rays using the High Resolution (HiRes)	     |
    |	 Fly's Eye Detector			     |
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			ABSTRACT



Ultra-high energy cosmic rays with energies in excess of 10^20 eV have
been observed. The existence of such high energy particles is puzzling,
both in terms of their production as well as their propagation through
the Universe.  The detection and measurement of these particles is
challenging due to the extremely low flux of approximately  
1 event/km^2-steradian/century for cosmic rays at this energy scale.
The detection and measurement of these particles using the 
"Air Fluorescence technique" that utilizes the atmosphere as a
calorimetric detector will be the focus of the talk.