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Measurement of the energy spectrum of cosmic rays above 10<sup>18</sup> eV using the Pierre Auger Observatory

Abstract:

We report a measurement of the flux of cosmic rays with unprecedented precision and statistics using the Pierre Auger Observatory. Based on fluorescence observations in coincidence with at least one surface detector we derive a spectrum for energies above 1018 eV. We also update the previously published energy spectrum obtained with the surface detector array. The two spectra are combined addressing the systematic uncertainties and, in particular, the influence of the energy resolution on the spectral shape. The spectrum can be described by a broken power law E- γ with index γ = 3.3 below the ankle which is measured at log10 (Eankle / eV) = 18.6. Above the ankle the spectrum is described by a power law with index 2.6 followed by a flux suppression, above about log10 (E / eV) = 19.5, detected with high statistical significance. © 2010 Elsevier B.V. All rights reserved.

Año de publicación:

2010

Keywords:

  • cosmic rays
  • Pierre auger observatory
  • Energy spectrum

Fuente:

scopusscopus

Tipo de documento:

Article

Estado:

Acceso restringido

Áreas de conocimiento:

    Áreas temáticas:

    • Física moderna
    • Cuerpos y fenómenos celestes específicos
    • Astronomía y ciencias afines

    Contribuidores:

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    Buchholz P.Buchholz P.
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    Dallier R.Dallier R.
    Chudoba J.Chudoba J.
    Becker K.H.Becker K.H.
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    Coutu S.Coutu S.
    Dagoret-Campagne S.Dagoret-Campagne S.
    Catalano O.Catalano O.
    Blanco M.Blanco M.
    Andringa S.Andringa S.
    Cronin J.W.Cronin J.W.
    Benzvi S.Y.Benzvi S.Y.
    De Donato C.De Donato C.
    Cataldi G.Cataldi G.
    Blanco F.Blanco F.
    Barbosa A.F.Barbosa A.F.
    Covault C.E.Covault C.E.
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    De Almeida R.M.De Almeida R.M.
    Conceiç˜ao R.Conceiç˜ao R.
    Cooper M.J.Cooper M.J.
    Javier GarciaJavier Garcia
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    Billoir P.Billoir P.
    Coluccia M.R.Coluccia M.R.
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    De Mello Junior W.J.M.De Mello Junior W.J.M.
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    Chinellato J.A.Chinellato J.A.
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    Cester R.Cester R.
    Bohã̌cov́a M.Bohã̌cov́a M.
    Criss A.Criss A.
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    Busca N.G.Busca N.G.
    Barroso S.L.C.Barroso S.L.C.
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    Souza V.d.Souza V.d.
    Curutiu A.Curutiu A.
    Blanch-Bigas O.Blanch-Bigas O.
    Assis P.Assis P.
    Badagnani D.Badagnani D.
    Clay R.W.Clay R.W.
    Berat C.Berat C.
    Asorey H.G.Asorey H.G.
    Ahn E.J.Ahn E.J.
    Bueno A.Bueno A.
    Chauvin J.Chauvin J.
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    Cordier A.Cordier A.
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    Alvarez-Mu˜niz J.Alvarez-Mu˜niz J.