Results 41 to 50 of about 73,503 (266)

Galactic cosmic rays

open access: yesJournal of Physics: Conference Series, 2006
In this brief review we describe the theory of the origin of Galactic cosmic rays. The concept that interaction near the source is the dominant source of ?-rays, and spallation secondaries seems best suited to explain the EGRET ?-spectrum of the inner Galaxy, the abundances of light elements, the anti-protons and the positrons.
openaire   +1 more source

Cosmic-Ray Boosted Diffuse Supernova Neutrinos

open access: yesAstronomy
The subject of boosted fluxes of dark matter or cosmic relic neutrinos via scattering on cosmic rays has received considerable attention recently. This article investigates the boosted neutrino flux from the scattering of cosmic rays and the so-far ...
Alexander Sandrock
doaj   +1 more source

The mass composition of cosmic rays measured with LOFAR

open access: yesEPJ Web of Conferences, 2017
High-energy cosmic rays, impinging on the atmosphere of the Earth initiate cascades of secondary particles, the extensive air showers. The electrons and positrons in the air shower emit electromagnetic radiation.
Hörandel Jörg R.   +15 more
doaj   +1 more source

Selected Topics in Cosmic Ray Physics

open access: yes, 2017
The search for the origin of cosmic rays is as active as ever, mainly driven by new insights provided by recent pieces of observation. Much effort is being channelled in putting the so called supernova paradigm for the origin of galactic cosmic rays on ...
Aloisio, R.   +3 more
core   +1 more source

Searches for Neutrinos from Large High Altitude Air Shower Observatory Ultra-high-energy γ-Ray Sources Using the IceCube Neutrino Observatory

open access: yesThe Astrophysical Journal Letters, 2023
Galactic PeV cosmic-ray accelerators (PeVatrons) are Galactic sources theorized to accelerate cosmic rays up to PeV in energy. The accelerated cosmic rays are expected to interact hadronically with nearby ambient gas or the interstellar medium, resulting
R. Abbasi   +389 more
doaj   +1 more source

The Dipole Anisotropy of Galactic Cosmic Rays [PDF]

open access: yes, 2018
The arrival directions of Galactic cosmic rays exhibit anisotropies up to the level of one per-mille over various angular scales. Recent observations of TeV-PeV cosmic rays show that the dipole anisotropy has a strong energy dependence with a phase-flip ...
Ahlers, Markus
core   +2 more sources

The Promise of Solid Lubricants for a Sustainable Future

open access: yesAdvanced Materials, EarlyView.
Lubricants are vital for technology, saving energy and resources. The industry seeks sustainable solutions beyond fossil fuels. Solid lubricants offer extremely low friction and reduce environmental impact, especially in harsh conditions. Can these solids truly replace liquid lubricants, or are they limited to extreme applications?
Philipp G. Grützmacher   +7 more
wiley   +1 more source

Cosmic Rays from Active Galactic Nuclei [PDF]

open access: yesThe Astrophysical Journal, 2008
Cosmic ray (CR) acceleration at the shock created by the expanding cocoons around active galactic nuclei (AGNs) is studied. It is shown that above the energy $10^{18}$ eV the overall energy spectrum of CRs, produced during the AGN evolution and released in the intergalactic space, has the form $N\propto ^{- }$, with $ \approx 2.6$, which extends up
openaire   +2 more sources

Theoretical challenges in acceleration and transport of ultra high energy cosmic rays: A review

open access: yesEPJ Web of Conferences, 2013
The wealth of data collected in the last few years thanks to the Pierre Auger Observatory and recently to the Telescope Array made the problem of the origin of ultra high energy cosmic rays a genuinely experimental/observational one.
Blasi Pasquale
doaj   +1 more source

Robust C–V Ratio Technique for Profiling Defects in Proton‐Irradiated 4H‐SiC

open access: yesAdvanced Electronic Materials, EarlyView.
A noise‐robust C–V ratio technique is introduced to profile radiation‐induced defects in proton‐irradiated 4H‐SiC Schottky diodes. By using analytical capacitance ratios instead of numerical differentiation, the method directly extracts trap‐density and effective trap‐energy profiles at room temperature.
Kibeom Kim   +4 more
wiley   +1 more source

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