We investigate the energy dependent residence time of extragalactic cosmic rays entering our Galaxy using CRPropa and current galactic magnetic models. With our simulation setup, we see the onset of diffusive propagation starting below ankle energies, and a strong suppressing of extragalactic cosmic rays entering our Galaxy below 0.1 EeV. We investigate anisotropy in this framework.
Ultra high energy cosmic rays (UHECRs) coming from many different sources are deflected by the galactic magnetic field (GMF) before arriving at Earth. Every source type emits cosmic rays (CRs) with unique energies and compositions which are not known yet. This contribution focuses on UHECRs originating from positions of active galactic nuclei (AGN). Because of uncertain existing GMF models, a...
Neutral particles, whose arrival directions directly indicate their origin, are valuable for investigating sources of ultra-high-energy cosmic rays (UHECRs). We expect that sources emitting UHECRs also produce neutrons through nuclear interactions and photo-pion production in their vicinity. These free neutrons, which undergo $\beta$-decay, can travel a mean distance of 9.2$\times (E$/EeV)...
In this contribution, a simulation based method to estimate the flux of secondary photons produced during the propagation of primary cosmic rays is presented. During their propagation cosmic ray particles interact with photon background fields such as the cosmic microwave background (CMB). Through photo-pion production and the subsequent decay of neutral pions, secondary photons are created....
The contributions focus on the implementation of graph neural networks to search for photons using the SD-433 and the Underground Muon Detector.
In this contribution we study the performance of convolutional neural networks discrimination of photon induced events from the hadronic background. We use simulated showers for the SD-1500 detector. We also investigate the influence of different input information and try to understand of which information the network is making use of.
- Introduce Pythia 8 model for hadronic interactions
- Motivate using Pythia 8 alongside the current state-of-the-art hadronic interaction models for (extensive) air shower simulations
- Discuss cross-sections among models and compared to Auger (p-air and pp)
- Discuss tune of Pythia 8 for air showers
- Discuss (status of) interface between Pythia 8 and Corsika 8
- Outlook on global tune...
The effects of isotropic, non-birefringent Lorentz violation in the photon sector can be studied with air showers induced by ultra-high-energy cosmic rays.
Using the 1-dimensional air shower simulation program CONEX, bounds on the studied Lorentz violation were set based on the significant reduction of the average atmospheric depth of the shower maximum $\langle X_\text{max}\rangle$ and its...
In this study, we measured the cosmic ray energy spectrum at the Pierre Auger Observatory using a surface detector array composed of Water-Cherenkov detectors, with the energy scale calibrated by a fluorescence detector. This contribution presents the spectrum measured with the 433 m array, which lowers the energy threshold from previous measurements to 63 PeV, enabling the characterization of...
The Fluorescence Detector (FD) of the Pierre Auger Observatory provides energy measurements of primary cosmic rays that are largely independent of specific models. These FD energy measurements are crucial for calibrating the energy reconstruction process of the Surface Detector. Consequently, the accuracy of the FD energy calibration plays a significant role in the systematic uncertainties...
Radio emissions of extensive air showers can be observed at the Pierre Auger Observatory with the AugerPrime radio detector (RD). As part of the AugerPrime upgrade, RD is being installed on $1660$ water-Cherenkov detectors on an area of about $3000 \text{ km}^2$ and consists of dual-polarized Short Aperiodic Loaded Loop Antennas (SALLA). To achieve high measurement precision, RD needs to be...
The Pierre Auger Observatory has detected downward terrestrial gamma-ray flashes (TGFs) with its Surface Detector. A key to understanding this high-energy radiation in thunderstorms is to combine such measurements with measurements of lightning processes in their earliest stages. With eleven modified Auger Engineering Radio Array (AERA) stations we can build an interferometric lightning...
Previous efforts at the Pierre Auger Observatory have shown that lightning related phenomena can be picked up by, and affect, each of its detector systems. Therefore as part of its monitoring, a system has been rolled out to detect thunderstorm conditions, enabling the investigation of thunderstorms and lightning using the Observatory's hybrid detectors.
As a successful testbed for air...
Primarily designed to detect ultra-high energy (UHE) cosmic rays, the Pierre Auger Observatory also possesses excellent sensitivity to UHE neutrinos. The Surface Detector array is used to search for highly inclined neutrino-induced air showers, which, though not observed yet, have clear characteristic signatures. Follow-up searches of UHE neutrinos in Gravitational Wave (GW) events are of...
In addition to its capabilities for precise measurement of ultra-high-energy (UHE, $E > 10^{17}\:\mathrm{eV}$) cosmic rays with the observation of extensive air showers, the Pierre Auger Observatory also encompasses the potential of effectively detecting UHE photons. These are closely connected to the origin or propagation of hadronic cosmic rays. Moreover, such UHE photons are also theorized...
