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Muons in air showers at the Pierre Auger Observatory: Mean number in highly inclined events

Abstract:

We present the first hybrid measurement of the average muon number in air showers at ultrahigh energies, initiated by cosmic rays with zenith angles between 62° and 80°. The measurement is based on 174 hybrid events recorded simultaneously with the surface detector array and the fluorescence detector of the Pierre Auger Observatory. The muon number for each shower is derived by scaling a simulated reference profile of the lateral muon density distribution at the ground until it fits the data. A 1019eV shower with a zenith angle of 67°, which arrives at the surface detector array at an altitude of 1450 m above sea level, contains on average (2.68±0.04±0.48(sys))×107 muons with energies larger than 0.3 GeV. The logarithmic gain dlnNμ/dlnE of muons with increasing energy between 4×1018eV and 5×1019eV is measured to be (1.029±0.024±0.030(sys)).

Año de publicación:

2015

Keywords:

    Fuente:

    scopusscopus

    Tipo de documento:

    Article

    Estado:

    Acceso abierto

    Áreas de conocimiento:

    • Física de partículas

    Áreas temáticas:

    • Física moderna

    Contribuidores:

    Albuquerque I.F.M.Albuquerque I.F.M.
    Buchholz P.Buchholz P.
    Abreu P.Abreu P.
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    Boncioli D.Boncioli D.
    Avenier M.Avenier M.
    De Oliveira J.De Oliveira J.
    Cocciolo G.Cocciolo G.
    Caruso R.Caruso R.
    Neto J.R.T.d.M.Neto J.R.T.d.M.
    de Jong S.J.de Jong S.J.
    Castellina A.Castellina A.
    Bonino R.Bonino R.
    Daumiller K.Daumiller K.
    Ave M.Ave M.
    Bäuml J.Bäuml J.
    Barber K.B.Barber K.B.
    Dallier R.Dallier R.
    Chudoba J.Chudoba J.
    Becker K.H.Becker K.H.
    Coutu S.Coutu S.
    Blanco M.Blanco M.
    Andringa S.Andringa S.
    Cronin J.W.Cronin J.W.
    Buscemi M.Buscemi M.
    Aab A.Aab A.
    Almela A.Almela A.
    Covault C.E.Covault C.E.
    Cazón L.Cazón L.
    Biermann P.L.Biermann P.L.
    Colalillo R.Colalillo R.
    Allekotte I.Allekotte I.
    Aglietta M.Aglietta M.
    De Almeida R.M.De Almeida R.M.
    Conceiç˜ao R.Conceiç˜ao R.
    Candusso M.Candusso M.
    Cooper M.J.Cooper M.J.
    Mary L. Díaz CastroMary L. Díaz Castro
    Javier GarciaJavier Garcia
    Chiavassa A.Chiavassa A.
    Billoir P.Billoir P.
    Aminaei A.Aminaei A.
    Coluccia M.R.Coluccia M.R.
    Dembinski H.Dembinski H.
    Bonifazi C.Bonifazi C.
    Allison P.Allison P.
    Di Giulio C.Di Giulio C.
    Allen J.D.Allen J.D.
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    Brancus I.Brancus I.
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    Chavez A.G.Chavez A.G.
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    Brown W.C.Brown W.C.
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    Dasso S.Dasso S.
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    Chinellato J.A.Chinellato J.A.
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    Dawson B.R.Dawson B.R.
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    Bohã̌cov́a M.Bohã̌cov́a M.
    Mitri I.D.Mitri I.D.
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    Domenico M.D.Domenico M.D.
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    Beatty J.J.Beatty J.J.
    Souza V.d.Souza V.d.
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    Clay R.W.Clay R.W.
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    Asorey H.G.Asorey H.G.
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    Caccianiga L.Caccianiga L.
    Bueno A.Bueno A.
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    Arqueros F.Arqueros F.
    Cordier A.Cordier A.
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    Al Samarai I.Al Samarai I.
    Brogueira P.Brogueira P.
    Alvarez Castillo J.Alvarez Castillo J.
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    Bertaina M.E.Bertaina M.E.
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    Deligny O.Deligny O.
    Alvarez-Mu˜niz J.Alvarez-Mu˜niz J.