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Probing the energy spectrum of hadrons in proton air interactions at ultrahigh ...
Cazon, Lorenzo; Conceição, Ruben; Riehn, FelixWe demonstrate that the shower-to-shower fluctuations of the muon content of extensive air showers correlate with the fluctuations of a variable of the first interaction of Ultra High Energy Cosmic Rays, which is computed from the fraction of energy carried by the hadrons that sustain the hadronic cascade. The influence of subsequent stages of the shower development is found to play a sub-dominant role. As a co...
Towards a Next Generation of CORSIKA: A Framework for the Simulation of Particl...
Engel, Ralph; Heck, Dieter; Huege, Tim; Pierog, Tanguy; Reininghaus, Maximilian; Riehn, Felix; Ulrich, Ralf; Unger, Michael; Veberič, DarkoA large scientific community depends on the precise modelling of complex processes in particle cascades in various types of matter. These models are used most prevalently in cosmic-ray physics, astrophysical-neutrino physics, and gamma-ray astronomy. In this white paper, we summarize the necessary steps to ensure the evolution and future availability of optimal simulation tools. The purpose of this document is ...
Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger Ob...
Pierre Auger collaboration (376 authors); Abreu, Pedro; Andringa, Sofia; Assis, Pedro; Barreira Luz, Ricardo Jorge; Blanco, Alberto; Cazon, LorenzoWe present a detailed study of the large-scale anisotropies of cosmic rays with energies above 4 EeV measured using the Pierre Auger Observatory. For the energy bins [4,8] EeV and $E\geq 8$ EeV, the most significant signal is a dipolar modulation in right ascension at energies above 8 EeV, as previously reported. In this paper we further scrutinize the highest-energy bin by splitting it into three energy ranges...
An Indication of anisotropy in arrival directions of ultra-high-energy cosmic r...
Pierre Auger collaboration (392 authors); Abreu, Pedro; Andringa, Sofia; Assis, Pedro; Barreira Luz, Ricardo Jorge; Blanco, Alberto; Cazon, LorenzoA new analysis of the data set from the Pierre Auger Observatory provides evidence for anisotropy in the arrival directions of ultra-high-energy cosmic rays on an intermediate angular scale, which is indicative of excess arrivals from strong, nearby sources. The data consist of 5514 events above with zenith angles up to 80° recorded before 2017 April 30. Sky models have been created for two distinct populations...
Observation of inclined EeV air showers with the radio detector of the Pierre A...
Pierre Auger collaboration (394 authors); Abreu, Pedro; Andringa, Sofia; Assis, Pedro; Barreira Luz, Ricardo Jorge; Blanco, Alberto; Cazon, LorenzoWith the Auger Engineering Radio Array (AERA) of the Pierre Auger Observatory, we have observed the radio emission from 561 extensive air showers with zenith angles between 60o and 84o. In contrast to air showers with more vertical incidence, these inclined air showers illuminate large ground areas of several km2 with radio signals detectable in the 30 to 80 MHz band. A comparison of the measured radio-signal a...
Inferences on mass composition and tests of hadronic interactions from 0.3 to 1...
Pierre Auger collaboration (405 authors); Abreu, Pedro; Andringa, Sofia; Assis, Pedro; Barreira Luz, Ricardo Jorge; Blanco, Alberto; Cazon, LorenzoWe present a new method for probing the hadronic interaction models at ultra-high energy and extracting details about mass composition. This is done using the time profiles of the signals recorded with the water-Cherenkov detectors of the Pierre Auger Observatory. The profiles arise from a mix of the muon and electromagnetic components of air-showers. Using the risetimes of the recorded signals we define a new ...
Data-driven model of the cosmic-ray flux and mass composition from 10 GeV to $1...
Dembinski, Hans Peter; Engel, Ralph; Fedynitch, Anatoli; Gaisser, Thomas; Riehn, Felix; Stanev, TodorWe present a new parametrization of the cosmic-ray flux and its mass composition over an energy range from 10 GeV to $10^{11}$ GeV. Our approach is data-driven and relies on theoretical assumptions as little as possible. We combine measurements of the flux of individual elements from high-precision satellites and balloon experiments with indirect measurements of mass groups from the leading air shower experimen...
The hadronic interaction model Sibyll – past, present and future
Engel, Ralph; Riehn, Felix; Fedynitch, Anatoli; Gaisser, Thomas K.; Stanev, TodorSibyll is one of the first microscopic interaction models that was specifically developed for interpreting cosmic ray data. It combines non-perturbative concepts of simulating hadronic particle production with predictions derived from perturbative QCD calculations, focusing on forward particle production of relevance in studying cosmic ray interactions. In this contribution we briefly recall the history of Siby...
A state-of-the-art calculation of atmospheric lepton fluxes
Fedynitch, Anatoli; Dembinski, Hans; Engel, Ralph; Gaisser, Thomas K.; Riehn, Felix; Stanev, TodorAtmospheric leptons are of continuous interest for several scientific communities. At low and intermediate energies, atmospheric neutrinos are the signal for studies of fundamental neutrino properties and at high energies, they constitute the background for the characterization of the features of the astrophysical neutrino flux. We have studied in depth the relation between observable inclusive lepton fluxes/ra...
The hadronic interaction model SIBYLL 2.3c and Feynman scaling
Riehn, Felix; Dembinski, Hans P.; Engel, Ralph; Fedynitch, Anatoli; Gaisser, Thomas K.; Stanev, TodorThe Monte Carlo model Sibyll has been designed for efficient simulation of hadronic multiparticle production up to the highest energies as needed for interpreting cosmic ray measurements. For more than 15 years, version 2.1 of Sibyll has been one of the standard models for air shower simulation. Motivated by data of LHC and fixed-target experiments and a better understanding of the phenomenology of hadronic int...