scholarly journals Ultra-high energy cosmic rays, entering a new era of astroparticle physics and detection techniques

2008 ◽  
Author(s):  
Olaf Scholten
Keyword(s):  
Cosmic Rays ◽  
High Energy ◽  
Ultra High Energy ◽  
Astroparticle Physics ◽  
New Era ◽  
Detection Techniques ◽  
High Energy Cosmic Rays

EXPLORING THE ULTRA-HIGH ENERGY SKY: STATUS AND FIRST RESULTS OF THE PIERRE AUGER OBSERVATORY

2008 ◽  
Vol 23 (04) ◽  
pp. 221-236 ◽  
Author(s):  
VERONIQUE VAN ELEWYCK
Keyword(s):  
Cosmic Rays ◽  
Present Status ◽  
High Energy ◽  
Pierre Auger Observatory ◽  
Ultra High Energy ◽  
Detection Techniques ◽  
High Energy Cosmic Rays ◽  
Combined Use ◽  
First Results ◽  
Hybrid Detector

The Pierre Auger Southern Observatory, a hybrid detector for the study of ultra-high energy cosmic rays (UHECRs), is now operating for more than three years and approaching completion. This paper describes the present status and the performance of the Observatory, with an emphasis on the advantages provided by the combined use of two different detection techniques. A panorama of the most recent results related to the spectrum, composition and arrival directions of the UHECR is then presented, along with a brief discussion of their impact on our knowledge of the UHECRs' origin and composition.

scholarly journals ULTRA–HIGH-ENERGY COSMIC RAYS

2006 ◽  
Vol 21 (08n09) ◽  
pp. 1950-1961 ◽  
Author(s):  
STEFAN WESTERHOFF
Keyword(s):  
Energy Spectrum ◽  
Cosmic Rays ◽  
Energy Loss ◽  
Cosmic Ray ◽  
High Energy ◽  
Ultra High Energy ◽  
New Era ◽  
High Energy Cosmic Rays ◽  
Open Questions ◽  
The Many

One of the most striking astrophysical phenomena today is the existence of cosmic ray particles with energies in excess of 1020 eV. While their presence has been confirmed by a number of experiments, it is not clear where and how these particles are accelerated to these energies and how they travel astronomical distances without substantial energy loss. We are entering an exciting new era in cosmic ray physics, with instruments now producing data of unprecedented quality and quantity to tackle the many open questions. This paper reviews the current experimental status of cosmic ray physics and summarizes recent results on the energy spectrum and arrival directions of ultra-high-energy cosmic rays.

scholarly journals Planck Neutrinos as Ultra High Energy Cosmic Rays

2020 ◽  
Vol 29 (1) ◽  
pp. 40-46
Author(s):  
Dmitri L. Khokhlov
Keyword(s):  
Black Holes ◽  
Cosmic Rays ◽  
Standard Model ◽  
Active Galactic Nuclei ◽  
Planck Scale ◽  
Galactic Nuclei ◽  
High Energy ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays ◽  
The Standard Model

AbstractThe studied conjecture is that ultra high energy cosmic rays (UHECRs) are hypothetical Planck neutrinos arising in the decay of the protons falling onto the gravastar. The proton is assumed to decay at the Planck scale into positron and four Planck neutrinos. The supermassive black holes inside active galactic nuclei, while interpreted as gravastars, are considered as UHECR sources. The scattering of the Planck neutrinos by the proton at the Planck scale is considered. The Planck neutrinos contribution to the CR events may explain the CR spectrum from 5 × 1018 eV to 1020 eV. The muon number in the Planck neutrinos-initiated shower is estimated to be larger by a factor of 3/2 in comparison with the standard model that is consistent with the observational data.

ENERGY ORDERING EFFECTS IN THE ARRIVAL DIRECTIONS OF ULTRA-HIGH ENERGY COSMIC RAYS MEASURED BY THE PIERRE AUGER OBSERVATORY

2011 ◽  
Vol 20 (supp02) ◽  
pp. 50-56
Author(s):  
◽  
PETER SCHIFFER
Keyword(s):  
Cosmic Rays ◽  
Magnetic Fields ◽  
Charged Particles ◽  
High Energy ◽  
Pierre Auger Observatory ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays ◽  
Ordering Effects ◽  
Arrival Directions

The Pierre Auger Observatory is the world's largest experiment for the measurement of ultra-high energy cosmic rays (UHECRs). These UHECRs are assumed to be to be charged particles, and thus are deflected in cosmic magnetic fields. Recent results of the Pierre Auger Observatory addressing the complex of energy ordering of the UHECRs arrival directions are reviewed in this contribution. So far no significant energy ordering has been observed.

scholarly journals High energy cosmic ray interactions and UHECR composition problem

2019 ◽  
Vol 210 ◽  
pp. 02001
Author(s):  
Sergey Ostapchenko
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Cosmic Rays ◽  
Cosmic Ray ◽  
High Energy ◽  
Ultra High Energy ◽  
Hadronic Interactions ◽  
High Energy Cosmic Rays ◽  
Cosmic Ray Interactions ◽  
Composition Problem

The differences between contemporary Monte Carlo generators of high energy hadronic interactions are discussed and their impact on the interpretation of experimental data on ultra-high energy cosmic rays (UHECRs) is studied. Key directions for further model improvements are outlined. The prospect for a coherent interpretation of the data in terms of the UHECR composition is investigated.

Ultra-High Energy Cosmic Rays and Cosmogenic Neutrinos

2004 ◽  
Vol 136 ◽  
pp. 159-168 ◽  
Author(s):  
M. Ave ◽  
N. Busca ◽  
A.V. Olinto ◽  
A.A. Watson ◽  
T. Yamamoto
Keyword(s):  
Cosmic Rays ◽  
High Energy ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays
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