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Average depth of shower maximum in “knee” region as measured by the Dual Imaging Cerenkov Experiment

1997; Elsevier BV; Volume: 52; Issue: 3 Linguagem: Inglês

10.1016/s0920-5632(96)00866-3

1873-3832

Kelly Boothby, M. Chantell, K.D. Green, D. Kieda, J. Knapp, C. G. Larsen, S. P. Swordy,

High-Energy Particle Collisions Research

Preliminary results on the average depth of shower maximum (〈Xmax〉) are presented using data from the Dual Imaging Cerenkov Experiment (DICE). A change in the cosmic ray spectral slope is detected and is in qualitative agreement with other experiments. A small increase in 〈Xmax〉 is present at onset of the “knee”, consistent with an increase in the relative number of lighter elements. Further analysis which incorporates data from the Chicago Air Shower Array and Michigan Array (CASA—MIA) will test this tentative interpretation.