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

0449907 - FZÚ 2016 RIV US eng J - Článek v odborném periodiku
Aab, A. - Abreu, P. - Aglietta, M. - Boháčová, Martina - Chudoba, Jiří - Ebr, Jan - Mandát, Dušan - Nečesal, Petr - Palatka, Miroslav - Pech, Miroslav - Prouza, Michael - Řídký, Jan - Schovánek, Petr - Trávníček, Petr - Vícha, Jakub … celkem 480 autorů
Muons in air showers at the Pierre Auger Observatory: mean number in highly inclined events.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 91, č. 3 (2015), , "032003-1"-"032003-12". ISSN 1550-7998
Grant CEP: GA MŠMT(CZ) LG13007; GA MŠMT(CZ) 7AMB14AR005; GA ČR(CZ) GA14-17501S
Institucionální podpora: RVO:68378271
Klíčová slova: Pierre Auger Observatory * air showers * ultrahigh energies * cosmic rays * detector
Kód oboru RIV: BF - Elementární částice a fyzika vys. energií
Impakt faktor: 4.506, rok: 2015

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 degrees and 80 degrees. 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 10(19) eV shower with a zenith angle of 67 degrees, 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)) x 10(7) muons with energies larger than 0.3 GeV. The logarithmic gain d lnN mu/d ln E of muons with increasing energy between 4 x 10(18) eV and 5 x 10(19) eV is measured to be (1.029 +/- 0.024) 0.030(sys)).
Trvalý link: http://hdl.handle.net/11104/0251306