Brian Wundheiler

Long-term monitoring of the optical performance of the primary mirrors at the Coihueco and Loma Amarilla sites of the Pierre Auger Observatory

Adila Abdul Halim, P. Abreu, M. Aglietta, M. Ahmed et autres

Abstract This paper presents the results of an optical performance monitoring campaign for the primary mirrors installed in fluorescence telescopes at the Coihueco and Loma Amarilla sites at the Pierre Auger Observatory in Argentina. Since the end of 2003, this effort has …

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Bounds on Lorentz Invariance Violation from Muon Fluctuations at the Pierre Auger Observatory

Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte et autres

Quantum gravity theories often modify spacetime symmetries. In particular, Lorentz invariance may be violated when approaching the Planck scale. Although the scales at which interactions occur in extensive air showers induced by ultra-high-energy cosmic rays in the atmosphere are many orders of …

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Search for Ultra-high-energy Neutrons from Galactic Sources with the Pierre Auger Observatory

Adila Abdul Halim, P. Abreu, M. Aglietta, I. Allekotte et autres

Abstract Deflections in the propagation of charged ultra-high-energy cosmic rays (UHECRs) caused by magnetic fields make the identification of their sources challenging. On the other hand, the arrival directions at Earth of neutrons point directly to their origin. The emission of UHECRs …

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Inference of the Mass Composition of Cosmic Rays with energies between 3 and 100 EeV using the data of the Pierre Auger Observatory and Deep Learning

Berenika Čermáková, Adila Abdul Halim, Pedro Abreu, Marco Aglietta et autres

Located in Argentina, the Pierre Auger Observatory is the largest cosmic-ray observatory on Earth. The Observatory is a hybrid detector employing different detection principles to observe multiple components of air showers. The core part of the detector is the Surface Detector (SD), …

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Exploring the Ultra-High-Energy Universe: Highlights from the Pierre Auger Observatory

M. Roth, Adila Abdul Halim, P. Abreu, M. Aglietta et autres

The Pierre Auger Observatory is the world’s largest facility dedicated to studying ultra-high-energy cosmic rays (UHECRs). Located in Argentina, it spans 3,000 square kilometers and utilizes a hybrid detection system comprising over 1,600 Water-Cherenkov detectors and fluorescence telescopes. Since its inception in …

Scaler data from the Pierre Auger Observatory as a proxy of solar activity

C. Taricco, Adila Abdul Halim, P. Abreu, M. Aglietta et autres

Solar activity variations strongly impact the modulation of the flux of low-energy Galactic Cosmic Rays (GCRs) reaching the Earth. The secondary particles, which originate from the interaction of GCRs with the atmosphere, can be revealed by an array of ground detectors. We …

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Detection of Spaceborne Lasers with the Pierre Auger Observatory

M. Unger, Adila Abdul Halim, P. Abreu, Marco Aglietta et autres

The detection of side-scattered ultraviolet light from spaceborne lasers with fluorescence telescopes of cosmic ray observatories offers unique opportunities for systematic studies of the aerosol content of the local atmosphere. It also enables the validation of the optical calibration of the telescopes. …

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Event reconstruction with the Radio detector of the Pierre Auger Observatory

Simon Strähnz, Adila Abdul Halim, P. Abreu, M. Aglietta et autres

The surface detector of the Pierre Auger Observatory has recently been upgraded with the addition of radio antennas, forming the radio detector (RD). This contribution outlines the standard methods for reconstructing extensive air showers using the RD, along with recent developments. The …

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Measurement of the cosmic-ray energy spectrum above 2.5 EeV using 19 years of operation of the Pierre Auger Observatory

Diego Ravignani, Adila Abdul Halim, P. Abreu, Marco Aglietta et autres

We present the spectrum of cosmic rays with energies above 2.5 EeV measured at the Pierre Auger Observatory after 19 years of operation, covering the period before the AugerPrime upgrade. Two independent event sets from the surface array of 1500-m spaced detectors …

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Characterizing the neutron component of extensive air showers with the Surface-Scintillator Detectors of AugerPrime

Tobias Schulz, Adila Abdul Halim, P. Abreu, M. Aglietta et autres

Neutrons are the only neutral hadrons that remain stable over the timescale of an air-shower development. Their energy is lost only through hadronic interactions and quasi-elastic scattering, which results in their high abundance at the ground. The signals from the electromagnetic and …

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Observation of the Shadows of the Moon and Sun Using the Pierre Auger Observatory at an Average Energy of $7\times10^{17}\,$eV

Katarína Simkova, Adila Abdul Halim, P. Abreu, M. Aglietta et autres

The interaction of cosmic rays with celestial bodies such as the Moon or the Sun produces a shadow in the arrival direction distribution of the cosmic rays reaching the Earth. Such deficits from an isotropic flux have been observed by astroparticle observatories …

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A prototype station of the IceCube-Gen2 Surface Array at the Pierre Auger Observatory

Stef Verpoest, Benjamin Flaggs, Carmen Merx, M. Ackermann et autres

The detection of extensive air showers using radio antennas has evolved into a mature technique, complementing particle detector arrays by providing sensitivity to the longitudinal development of the showers and enabling an independent determination of the cosmic-ray energy. Both the Pierre Auger …

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