scholarly journals Measurements of the Depth of Maximum of Air-Shower Profiles at the Pierre Auger Observatory and their Composition Implications

2016 ◽  
Author(s):  
V. de Souza
Keyword(s):  
Pierre Auger Observatory ◽  
Air Shower

scholarly journals Depth of maximum of air-shower profiles: testing the compatibility of measurements performed at the Pierre Auger Observatory and the Telescope Array experiment

2019 ◽  
Vol 210 ◽  
pp. 01009
Author(s):  
Alexey Yushkov ◽  
Jose Bellido ◽  
John Belz ◽  
Vitor de Souza ◽  
William Hanlon ◽  
...  
Keyword(s):  
Quantitative Comparison ◽  
Pierre Auger Observatory ◽  
Array Detector ◽  
Air Showers ◽  
Fluorescence Detector ◽  
Telescope Array ◽  
Longitudinal Development ◽  
Air Shower ◽  
Direct Observations ◽  
Systematic Uncertainties

At the Pierre Auger Observatory and the Telescope Array, the measurements of depths of maximum of airshower profiles, Xmax, are performed using direct observations of the longitudinal development of showers with the help of the fluorescence telescopes. Though the same detection technique is used at both installations, the straightforward comparison of the characteristics of the measured Xmax distributions is not possible due to the different approaches to the analysis of the recorded events. In this work, the Auger – Telescope Array composition working group presents a technique to compare the Xmax measurements from the Auger Observatory and the Telescope Array. Applying this technique the compatibility of the first two moments of the measured Xmax distributions is qualitatively tested for energies 1018.2 eV < E < 1019.0 eV using the recently published Telescope Array data from the Black Rock Mesa and Long Ridge fluorescence detector stations. For a quantitative comparison, simulations of air showers with EPOS-LHC, folded with effects of the Telescope Array detector, are required along with the inclusion in the analysis of the systematic uncertainties in the measurements of Xmax and the energies of the events.

scholarly journals Direct measurement of the muonic content of extensive air showers between $$\mathbf { 2\times 10^{17}}$$ and $$\mathbf {2\times 10^{18}}~$$eV at the Pierre Auger Observatory

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
A. Aab ◽  
◽  
P. Abreu ◽  
M. Aglietta ◽  
J. M. Albury ◽  
...  
Keyword(s):  
Direct Measurement ◽  
High Energy ◽  
Extensive Air Showers ◽  
Pierre Auger Observatory ◽  
Ultra High Energy ◽  
Air Showers ◽  
Fluorescence Detector ◽  
High Energy Cosmic Rays ◽  
Air Shower ◽  
Attenuation Corrected

Abstract The hybrid design of the Pierre Auger Observatory allows for the measurement of the properties of extensive air showers initiated by ultra-high energy cosmic rays with unprecedented precision. By using an array of prototype underground muon detectors, we have performed the first direct measurement, by the Auger Collaboration, of the muon content of air showers between $$2\times 10^{17}$$2×1017 and $$2\times 10^{18}$$2×1018 eV. We have studied the energy evolution of the attenuation-corrected muon density, and compared it to predictions from air shower simulations. The observed densities are found to be larger than those predicted by models. We quantify this discrepancy by combining the measurements from the muon detector with those from the Auger fluorescence detector at $$10^{{17.5}}\, {\mathrm{eV}} $$1017.5eV and $$10^{{18}}\, {\mathrm{eV}} $$1018eV. We find that, for the models to explain the data, an increase in the muon density of $$38\%$$38%$$\pm 4\% (12\%)$$±4%(12%)$$\pm {}^{21\%}_{18\%}$$±18%21% for EPOS-LHC, and of $$50\% (53\%)$$50%(53%)$$\pm 4\% (13\%)$$±4%(13%)$$\pm {}^{23\%}_{20\%}$$±20%23% for QGSJetII-04, is respectively needed.

scholarly journals Muon content of extensive air showers: Comparison of the energy spectra obtained by the Sydney University Giant Air-shower Recorder and by the Pierre Auger Observatory

2018 ◽  
Vol 98 (2) ◽  
Author(s):  
J. A. Bellido ◽  
R. W. Clay ◽  
N. N. Kalmykov ◽  
I. S. Karpikov ◽  
G. I. Rubtsov ◽  
...  
Keyword(s):  
Extensive Air Showers ◽  
Pierre Auger Observatory ◽  
Energy Spectra ◽  
Air Showers ◽  
Air Shower

scholarly journals Muon Content of Extensive Air Showers: Comparison of the Energy Spectra Obtained by the Sydney University Giant Air-Shower Recorder and by the Pierre Auger Observatory

2019 ◽  
Vol 82 (6) ◽  
pp. 694-698
Author(s):  
I. S. Karpikov ◽  
J. A. Bellido ◽  
R. W. Clay ◽  
N. N. Kalmykov ◽  
G. I. Rubtsov ◽  
...  
Keyword(s):  
Extensive Air Showers ◽  
Pierre Auger Observatory ◽  
Energy Spectra ◽  
Air Showers ◽  
Air Shower

scholarly journals Depth of maximum of air-shower profiles at the Pierre Auger Observatory. II. Composition implications

2014 ◽  
Vol 90 (12) ◽  
Author(s):  
A. Aab ◽  
P. Abreu ◽  
M. Aglietta ◽  
E. J. Ahn ◽  
I. Al Samarai ◽  
...  
Keyword(s):  
Pierre Auger Observatory ◽  
Air Shower

scholarly journals Direct measurement of upward-going ultrahigh energy dark matter at the Pierre Auger Observatory

2021 ◽  
Author(s):  
Ye Xu
Keyword(s):  
Dark Matter ◽  
Energy Range ◽  
Pierre Auger Observatory ◽  
Ultrahigh Energy ◽  
Extensive Air Shower ◽  
Air Shower ◽  
The Earth ◽  
Pass Through ◽  
Incoming Energy ◽  
Superheavy Dark Matter

Abstract It is assumed that two types of dark matter particles exist: superheavy dark matter particles (SHDM), the mass of which ∼ inflaton mass, and light fermion dark matter (DM) particles, which are the ultrahigh energy (UHE) products of the decay of SHDM. The Earth will be taken as a detector to search for the UHE DM particles directly. These upward-going particles, which pass through the Earth and air and interact with nuclei, can be detected by the fluorescence detectors (FD) of the Pierre Auger Observatory (Auger), via fluorescent photons due to the development of an extensive air shower. The numbers and fluxes of expected UHE DM particles are evaluated in the incoming energy range between 1 EeV and 1 ZeV with the different lifetimes of decay of SHDM and mass of Z′. According to the Auger data from 2008 to 2019, the upper limit for UHE DM fluxes is also estimated at 90% confidence limit with the FD of Auger. Finally, it is reasonable to make a conclusion that UHE DM particles could be directly detected in the energy range between O(1 EeV) and O(10 EeV) with the FD of Auger. This might prove whether SHDM particles exist in the Universe.

scholarly journals The Auger@TA Project: Phase II Progress and Plans

2019 ◽  
Vol 210 ◽  
pp. 05004 ◽  
Author(s):  
Corbin Covault ◽  
Toshihiro Fujii ◽  
Robert Halliday ◽  
Jeffrey Johnsen ◽  
Ryan Lorek ◽  
...  
Keyword(s):  
Phase Ii ◽  
Pierre Auger Observatory ◽  
Air Showers ◽  
Telescope Array ◽  
Air Shower ◽  
Surface Detector ◽  
Laser Facility ◽  
Micro Array ◽  
Water Tanks ◽  
Data Calibration

The Auger@TA project is a combined effort involving members of both the Pierre Auger Observatory and the Telescope Array experiment (TA) to cross-calibrate detectors and compare results on air showers detected at one location. We have recently reported results from Phase I of the project, during which we collected and presented data from two Auger water Cherenkov surface detector stations deployed into the TA experiment near the Central Laser Facility. For Phase II, we will deploy a micro-array of six or seven single-PMT Auger surface detector stations co-located with TA scintillator surface detector stations. The Auger micro-array will trigger and collect data independently from the TA allowing for a complete end-to-end comparison of detector data, calibration, and reconstructed event quantities on a shower-by-shower basis between the TA and Auger detector systems. We describe progress towards development of the micro-array for Phase II including the preparation of surface detector water tanks, station electronics, wireless communications, triggers, and data acquisition. We also outline plans for deploying the Auger@TA micro-array into the TA experiment in 2019 with preliminary estimates for coincident air-shower rates.

scholarly journals SEARCH FOR ULTRA-HIGH ENERGY PHOTONS USING AIR SHOWERS

2007 ◽  
Vol 22 (11) ◽  
pp. 749-766 ◽  
Author(s):  
MARKUS RISSE ◽  
PIOTR HOMOLA
Keyword(s):  
Particle Physics ◽  
Cosmic Ray ◽  
High Energy ◽  
Pierre Auger Observatory ◽  
Ultra High Energy ◽  
Air Showers ◽  
Fundamental Physics ◽  
Air Shower ◽  
The Universe

The observation of photons with energies above 1018 eV would open a new window in cosmic-ray research, with possible impact on astrophysics, particle physics, cosmology and fundamental physics. Current and planned air shower experiments, particularly the Pierre Auger Observatory, offer an unprecedented opportunity to search for such photons and to complement efforts of multimessenger observations of the universe. We summarize motivation, achievements, and prospects of the search for ultra-high energy photons.

scholarly journals Analysis of Longitudinal Air Shower Profiles measured by the Pierre Auger Observatory

2011 ◽  
Author(s):  
M. Unger ◽  
Hiroyuki Sagawa ◽  
Yoshiya Kawasaki ◽  
Takashi Sako ◽  
Masahiro Takeda ◽  
...  
Keyword(s):  
Pierre Auger Observatory ◽  
Air Shower
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