Ultra-high-energy hadronic physics at the Pierre Auger observatory: Muon measurements

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00635891" target="_blank" >RIV/68378271:_____/24:00635891 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0366864" target="_blank" >https://hdl.handle.net/11104/0366864</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.15407/ujpe69.11.792" target="_blank" >10.15407/ujpe69.11.792</a>

Result language

angličtina

Original language name

Ultra-high-energy hadronic physics at the Pierre Auger observatory: Muon measurements

Original language description

The Pierre Auger Observatory, the world's largest observatory of ultra-high-energy cosmic rays (UHECR), offers a unique insight into the properties of hadronic interactions occurring in air showers at energies well above those reached at human-made accelerators. The key probe into the hadronic interactions has, for a long time, been the number of muons arriving at the ground, which can be directly measured at Auger for energies up to 10 TeV using dedicated underground muon detectors or estimated through the observation of highly inclined showers using the surface detector of the Observatory. Further information can be obtained using the hybrid character of the Observatory, which allows the simultaneous observation of the longitudinal development of the shower with the fluorescence (and lately also radio) detector and the ground signal with the surface detector. Several different analyses using hybrid data show a discrepancy between the predictions of simulations based on the latest hadronic interaction models and data. This discrepancy has been long interpreted as a deficit in the number of muons predicted by the simulations with respect to the data. A new analysis using a global fit of the data on selected hybrid showers has shown that the disagreement between models and data is more complex and also involves the predictions for the depths of the maxima of the longitudinal shower development. At the same time, measurements of shower-to-shower fluctuations using inclined hybrid events show good agreement with the predictions, suggesting that the observed muon discrepancy is rather the result of a gradual accumulation of small changes during the shower development than of a major change in the properties of the first interaction. Recently, the Observatory has undergone an upgrade, which includes several components aimed at a significant improvement in the measurement of the muon content of the air showers.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Ukrainian Journal of Physics

ISSN

2071-0186

e-ISSN

2071-0194

Volume of the periodical

69

Issue of the periodical within the volume

11

Country of publishing house

UA - UKRAINE

Number of pages

7

Pages from-to

792-798

UT code for WoS article

001422242700006

EID of the result in the Scopus database

2-s2.0-86000725702