Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-03-10
Astropart.Phys. 19 (2003) 61-75
Astronomy and Astrophysics
Astrophysics
16 pages, 13 figures. Accepted for publication in Astroparticle Physics
Scientific paper
10.1016/S0927-6505(02)00189-5
At the Haverah Park Array a number of air shower observables were measured that are relevant to the determination of the mass composition of cosmic rays. In this paper we discuss measurements of the risetime of signals in large area water-Cherenkov detectors and of the lateral distribution function of the water-Cherenkov signal. The former are used to demonstrate that the CORSIKA code, using the QGSJET98 model, gives an adequate description of the data with a low sensitivity, in this energy range, to assumptions about primary mass. By contrast the lateral distribution is sufficiently well measured that there is mass sensitivity. We argue that in the range 0.2-1.0 EeV the data are well represented with a bi-modal composition of 34+-2 % protons and the rest iron. We also discuss the systematic errors induced by the choice of hadronic model.
Ave Maximo
Cazon Lorenzo
Hinton Jim A.
Knapp Jill
Lloyd-Evans Jeremy
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