Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....3..288h&link_type=abstract
Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o
Physics
Scientific paper
During the operation of the Haverah Park array data were collected on the risetime and lateral distribution of showers produced by primaries with energies above 3 x 1017 eV. These data clearly demonstrated the angular and energy dependence of two parameters which depend for their absolute magnitude on the position of the depth of shower maximum. Fluctuations in these parameters from shower to shower were also detected with very high significance. Shower models then available (ca 1980) were unable to account for even the average values of the risetimes and lateral distributions. However model-independent attempts to deduce the mass composition, based on Linsley's elongation rate theorem, were attempted (Walker and Watson 1981, Coy et al 1983). Now, 20 years later, shower models have advanced significantly, driven in part by the need for a full design study of the Auger Observatory. As a spin off, and also to guide future analysis of the Auger data, we are attempting to re-interpret the Haverah Park work using the most modern shower models. We present results from Monte Carlo calculations which predict the average risetime and lateral distribution of showers. New data on the elongation rate above 3 x 1017 are reported.
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