Monte Carlo simulations for the Pierre Auger Observatory using the VO auger grid resources

Puzzle of muons in extensive air showers

International Journal of Modern Physics D ◽

10.1142/s0218271819500974 ◽

2019 ◽

Vol 28 (08) ◽

pp. 1950097

Author(s):

Maciej Rybczyński ◽

Zbigniew Włodarczyk

Keyword(s):

Monte Carlo ◽

Cosmic Rays ◽

Monte Carlo Simulations ◽

Quark Matter ◽

Strange Quark ◽

Strange Quark Matter ◽

Pierre Auger Observatory ◽

Air Showers ◽

Hadronic Interaction ◽

Interaction Models

In order to examine a muon excess observed by the Pierre Auger Observatory, detailed Monte Carlo simulations were carried out for primary protons, iron nuclei and strangelets (hypothetical stable lumps of strange quark matter). We obtained a rough agreement between the simulations and the data for ordinary nuclei without any contribution of strangelets in primary flux of cosmic rays. Our simulations suggest that the shower observables are dominated by details of hadronic interaction models.

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Can strangelets solve the muon puzzle?

EPJ Web of Conferences ◽

10.1051/epjconf/201920804004 ◽

2019 ◽

Vol 208 ◽

pp. 04004

Author(s):

Maciej Rybczyński ◽

Zbigniew Włodarczyk

Keyword(s):

Monte Carlo ◽

Cosmic Rays ◽

Monte Carlo Simulations ◽

Quark Matter ◽

Strange Quark ◽

Strange Quark Matter ◽

Pierre Auger Observatory ◽

Primary Cosmic Rays

In order to examine a muon excess observed by the Pierre Auger Observatory, detailed Monte Carlo simulations were carried out, assuming the existence of strangelets (hypothetical stable lumps of strange quark matter) in the primary cosmic rays. We obtain a rough agreement between the simulations and the data for ordinary nuclei without any contribution of strangelets in the primary flux of cosmic rays.

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Low-voltage EDS of magnesium ferrite Dendrites in a FEG-SEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100164854 ◽

1996 ◽

Vol 54 ◽

pp. 478-479

Author(s):

Matthew T. Johnson ◽

Ian M. Anderson ◽

Jim Bentley ◽

C. Barry Carter

Keyword(s):

Monte Carlo ◽

Quantitative Analysis ◽

Monte Carlo Simulations ◽

Cross Section ◽

Spatial Resolution ◽

Low Voltage ◽

Magnesium Ferrite ◽

X Ray ◽

Interaction Volume ◽

Ferrite Spinel

Energy-dispersive X-ray spectrometry (EDS) performed at low (≤ 5 kV) accelerating voltages in the SEM has the potential for providing quantitative microanalytical information with a spatial resolution of ∼100 nm. In the present work, EDS analyses were performed on magnesium ferrite spinel [(MgxFe1−x)Fe2O4] dendrites embedded in a MgO matrix, as shown in Fig. 1. spatial resolution of X-ray microanalysis at conventional accelerating voltages is insufficient for the quantitative analysis of these dendrites, which have widths of the order of a few hundred nanometers, without deconvolution of contributions from the MgO matrix. However, Monte Carlo simulations indicate that the interaction volume for MgFe2O4 is ∼150 nm at 3 kV accelerating voltage and therefore sufficient to analyze the dendrites without matrix contributions.Single-crystal {001}-oriented MgO was reacted with hematite (Fe2O3) powder for 6 h at 1450°C in air and furnace cooled. The specimen was then cleaved to expose a clean cross-section suitable for microanalysis.

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