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A Multi-Component Measurement of the Cosmic Ray Composition Between 10¹⁷ eV and 10¹⁸ eV

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arxiv astro-ph/9911144 v1 pith:OTEM5QFL submitted 1999-11-09 astro-ph

A Multi-Component Measurement of the Cosmic Ray Composition Between 10¹⁷ eV and 10¹⁸ eV

T.Abu-Zayyad , K.Belov , D.J.Bird , J.Boyer , Z.Cao , M.Catanese , G.F.Chen , R.W.Clay
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C.E.Covault J.W.Cronin H.Y.Dai B.R.Dawson J.W.Elbert B.E.Fick L.F.Fortson J.W.Fowler K.G.Gibbs M.A.K.Glasmacher K.D.Green Y.Ho A.Huang C.C.Jui M.J.Kidd D.B.Kieda B.C.Knapp S.Ko C.G.Larsen W.Lee E.C.Loh E.J.Mannel J.Matthews J.N.Matthews B.J.Newport D.F.Nitz R.A.Ong K.M.Simpson J.D.Smith D.Sinclair P.Sokolsky P.Sommers C.Song J.K.K.Tang S.B.Thomas J.C.van der Velde L.R.Wiencke C.R.Wilkinson S.Yoshida X.Z.Zhang (HiRes-MIA Collaboration)
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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.

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