Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-11-09
Phys.Rev.Lett.84:4276-4279,2000
Astronomy and Astrophysics
Astrophysics
14 pages including 3 figures in revtex epsf style, submited to PRL
Scientific paper
10.1103/PhysRevLett.84.4276
The average mass composition of cosmic rays with primary energies between $10^{17}$eV and $10^{18}$eV has been studied using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum, $X_{max}$, and in the change in the muon density at a fixed core location, $\rho_\mu(600m)$, as a function of energy. The composition has also been evaluated in terms of the combination of $X_{max}$ and $\rho_\mu(600m)$. The results show that the composition is changing from a heavy to lighter mix as the energy increases.
Abu-Zayyad Tareq
Belov Konstantin
Bird John D.
Boyer J.
Cao Zhoujian
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