From the 1 of 6.1k papers with an AI index.
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13 papers · 2 filters
On the Origin of Cosmic Rays
R. Plaga
The problem in identifying the sites of origin of Galactic Cosmic Rays (CRs) is reviewed. Recent observational evidence from very-high energy (VHE, energies above 100 GeV) gamma-ra…
A precision calculation of the effective number of cosmological neutrinos
G. Mangano, G. Miele, S. Pastor +1
The neutrino energy density of the Universe can be conveniently parametrized in terms of the so-called effective number of neutrinos, N_nu^eff. This parameter enters in several cos…
Very high-energy gamma-ray observations of the Crab nebula and other potential sources with the GRAAL experiment
F. Arqueros, J. Ballestrin, M. Berenguel +6
The ``Gamma Ray Astronomy at ALmeria'' (GRAAL) experiment uses 63 heliostat-mirrors with a total mirror area of ~ 2500 m2 from the CESA-1 field at the ``Plataforma Solar de Almeria…
Very high-energy observations of the Crab nebula with the GRAAL experiment
F. Arqueros, J. Ballestrin, M. Berenguel +6
The ``Gamma Ray Astronomy at ALmeria'' (GRAAL) experiment uses 63 heliostat-mirrors with a total mirror area of ~ 2500 m2 from the CESA-1 field to collect Cherenkov light from airs…
A possible use for polarizers in imaging atmospheric Cherenkov telescopes
I. de la Calle, J. L. Contreras, J. Cortina +1
Cherenkov radiation produced in Extensive Air Showers shows a net polarization. This article discusses its properties and physical origin, and proposes an arrangement of polarizers…
Photons as Ultra High Energy Cosmic Rays ?
O. E. Kalashev, V. A. Kuzmin, D. V. Semikoz +1
We study spectra of the Ultra High Energy Cosmic Rays assuming primaries are protons and photons, and that their sources are extragalactic. We assume power low for the injection sp…