The Underground Muon Detector of AugerPrime: Status and Performance

As part of the upgrade of the Pierre Auger Observatory, known as AugerPrime, the Underground Muon Detector is being installed in the low-energy extension of the Surface Detector, allowing for a direct measurement of the muonic component of air showers produced by ultra-high-energy cosmic rays with energies between $10^{16.8}$ and $10^{19}$ eV. The detector consists of an array of 30 m$^2$ plastic scintillator detectors buried 2.3 m underground near a water-Cherenkov detector. Two modes of operation are implemented to achieve an extended dynamic range: the binary mode, conceived for low muon densities, and the calorimetric mode, designed for high muon densities. In this contribution, we present the current status and improvements in the reconstruction and performance of this component of AugerPrime.

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Published
2025-09-23
DOI
https://doi.org/10.22323/1.501.0237
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Astrophysics and Cosmic Phenomena
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article
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article

The Underground Muon Detector of AugerPrime: Status and Performance

Belén Andrada, Pedro J. Costa, Zbigniew Szadkowski, Bruno L. Lago et al.
Astrophysics and Cosmic Phenomena
article

The Underground Muon Detector of AugerPrime: Status and Performance

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Abstract

As part of the upgrade of the Pierre Auger Observatory, known as AugerPrime, the Underground Muon Detector is being installed in the low-energy extension of the Surface Detector, allowing for a direct measurement of the muonic component of air showers produced by ultra-high-energy cosmic rays with energies between $10^{16.8}$ and $10^{19}$ eV. The detector consists of an array of 30 m$^2$ plastic scintillator detectors buried 2.3 m underground near a water-Cherenkov detector. Two modes of operation are implemented to achieve an extended dynamic range: the binary mode, conceived for low muon densities, and the calorimetric mode, designed for high muon densities. In this contribution, we present the current status and improvements in the reconstruction and performance of this component of AugerPrime.

Strong, Ministerul Cercetării, Inovării şi Digitalizării, European Commission, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Fundação de Amparo à Pesquisa do Estado de São Paulo, Ministerstvo Školství, Mládeže a Tělovýchovy, Grantová Agentura České Republiky, Bundesministerium für Bildung und Forschung, Fonds De La Recherche Scientifique - FNRS, Consejo Nacional de Investigaciones Científicas y Técnicas, Fonds Wetenschappelijk Onderzoek, Consejo Nacional de Ciencia y Tecnología, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Centre National de la Recherche Scientifique, Financiadora de Estudos e Projetos, Istituto Nazionale di Astrofisica, Universidad Nacional Autónoma de México, Ministério da Ciência, Tecnologia, Inovações e Comunicações, Vlaamse regering, Istituto Nazionale di Fisica Nucleare, Ministerium für Kultur und Wissenschaft des Landes Nordrhein-Westfalen, Helmholtz Alliance for Astroparticle Physics, Ministero dell'Università e della Ricerca, Fundação para a Ciência e a Tecnologia, Agencia Nacional de Promoción Científica y Tecnológica, Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México, Institut National de Physique Nucléaire et de Physique des Particules
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Astrophysics and Cosmic Phenomena
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