New constraints on the mass composition of cosmic rays above 10^17 eV
from Volcano Ranch measurements
release_vcmedeergraj7lwtl57hyf5j5y
by
M. T. Dova, M. E. Mancenido, A. G. Mariazzi, T. P. McCauley, A. A.
Watson
2003
Abstract
Linsley used the Volcano Ranch array to collect data on the lateral
distribution of showers produced by cosmic rays at energies above 10^17 eV.
Very precise measurements of the steepness of the lateral distribution function
were made on 366 events. The current availability of sophisticated hadronic
interaction models has prompted an interpretation of the measurements. In this
analysis we use the AIRES Monte Carlo code to generate showers, together with
GEANT4 to simulate the detector response to ground particles. The results show
that, with the assumption of a bi-modal proton and iron mix, iron is the
dominant component of cosmic rays between 5x10^17 and 10^19 eV, assuming that
hadronic interactions are well-described by QGSJET at this energy range.
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astro-ph/0312463v1
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