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Title: 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 ultra-high energies, initiated by cosmic rays with zenith angles between 62° and 80° . Our 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°, 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.)) × 10 7 muons with energies larger than 0.3 GeV. Finally, the logarithmic gain d ln N µ/d ln E of muons with increasing energy between 4 × 10 18 eV and 5 × 10 19 eV is measured to be (1.029 ± 0.024 ± 0.030 (sys.)).

Authors:
 [1]
  1. Univ. of Siegen (Germany). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
Pierre AugerCollaboration
OSTI Identifier:
1234840
Report Number(s):
FERMILAB-PUB-14-290-AD-AE-E-TD
Journal ID: ISSN 1550-7998; arXiv eprint number arXiv:1408.1421
Grant/Contract Number:
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 91; Journal Issue: 05; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Aab, Alexander. Muons in air showers at the Pierre Auger Observatory: Mean number in highly inclined events. United States: N. p., 2015. Web. doi:10.1103/PhysRevD.91.059901.
Aab, Alexander. Muons in air showers at the Pierre Auger Observatory: Mean number in highly inclined events. United States. doi:10.1103/PhysRevD.91.059901.
Aab, Alexander. Mon . "Muons in air showers at the Pierre Auger Observatory: Mean number in highly inclined events". United States. doi:10.1103/PhysRevD.91.059901. https://www.osti.gov/servlets/purl/1234840.
@article{osti_1234840,
title = {Muons in air showers at the Pierre Auger Observatory: Mean number in highly inclined events},
author = {Aab, Alexander},
abstractNote = {We present the first hybrid measurement of the average muon number in air showers at ultra-high energies, initiated by cosmic rays with zenith angles between 62° and 80° . Our 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 1019 eV 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. Finally, the logarithmic gain d ln Nµ/d ln E of muons with increasing energy between 4 × 1018 eV and 5 × 1019 eV is measured to be (1.029 ± 0.024 ± 0.030 (sys.)).},
doi = {10.1103/PhysRevD.91.059901},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 05,
volume = 91,
place = {United States},
year = {Mon Mar 09 00:00:00 EDT 2015},
month = {Mon Mar 09 00:00:00 EDT 2015}
}

Journal Article:
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Cited by: 19 works
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