Showing papers in "Astroparticle Physics in 2006"
TL;DR: In this paper, the authors constrain the possibility of a non-trivial refractive index in free space corresponding to an energy-dependent velocity of light: c(E) ≤ c0(1 − − E/M), where M is a mass scale that might represent effect of quantum-gravitational space-time foam, using the arrival times of sharp features observed in the intensities of radiation with different energies from a large sample of gamma-ray bursters (GRBs) with known redshifts.
267 citations
TL;DR: In this paper, the performance of the acoustic positioning system, which enables the spatial reconstruction of the ANTARES neutrino telescope with a precision of about 10 cm, is verified.
149 citations
TL;DR: In this article, a new approach to the detection of radio transients associated with extensive air showers induced by ultra high energy cosmic rays is proposed, which makes possible for the first time the study of radio-signal features on an event-by-event basis.
116 citations
TL;DR: In this article, a cosmic ray (CR) shock code in one-dimensional spherical geometry with which the particle distribution, the gas flow and their nonlinear interaction can be followed numerically in a frame comoving with an expanding shock was developed.
116 citations
TL;DR: In this article, it was shown that at wavelengths comparable to the length of the shower produced by an Ultra-High Energy cosmic ray or neutrino, radio signals are an extremely efficient way to detect these particles.
69 citations
TL;DR: In this paper, the performance of simple event reconstruction methods when applied to simulated data of the Very Energetic Radiation Imaging Telescope Array System (VERITAS) experiment is discussed. But the main emphasis of the paper is the discussion of γ-hadron separation methods for the VERITAS experiment.
67 citations
TL;DR: In this article, the authors used distance-redshift data to impose strong constraints on dark energy models even when the equation of state is oscillatory, despite the double integral dependence of the distance on the equations of state.
56 citations
TL;DR: In this article, a simple 3D-reconstruction method for gamma-ray induced air showers is presented, which takes full advantage of the assets of a system of Atmospheric Cherenkov Telescopes combining stereoscopy and fine-grain imaging like the H.E.S.
53 citations
TL;DR: In this article, a model calculation of the fluorescence emission from relevant band systems of nitrogen in dependence on wavelength and atmospheric conditions is presented, where different calculations are compared to each other in combination with varying input parameters.
39 citations
TL;DR: In this article, a characterisation of piezo sensors for acoustic particle detection is presented, where electrical impedance, mechanical displacement and the sensitivity of the sensors are measured and modelled using a simple equivalent circuit diagram.
28 citations
TL;DR: A silicon-tungsten sampling imagingcalorimeter has been designed and built for the PAMELA-satellite-borne experiment as discussed by the authors, with the main physics goals of the experiment being the themeasurement of the flux of anti
TL;DR: In this article, the fluorescence yield for dry air and pure nitrogen excited by electrons is calculated using a combination of well-established molecular properties and experimental data of the involved cross-sections.
TL;DR: In this article, experimental data on cosmic ray cascades with enlarged attenuation lengths (Tien-Shan effect) are presented and analyzed in terms of charm hadroproduction. And the very first estimates of charm-hadroproduction cross sections from experimental data at high energies are confirmed and compared with recent accelerator results.
TL;DR: In this article, the authors analyzed the possibility of strongly interacting neutrino primaries and derived model-independent quantitative requirements on the neutrinosnucleon inelastic cross section for a viable explanation of the cosmic ray data.
TL;DR: In this paper, the authors made a statistical study of 163 solar proton events (SPEs) associated with X-ray flares, coronal mass ejections (CMEs), and radio type I I I bursts during January 1997-June 2005.
TL;DR: In this article, the probability of an electron-positron pair being produced in the presence of a strong magnetic field with time-varying strength was investigated. And the results showed that the presence in general enhances the production of pairs.
TL;DR: In this article, the authors confirmed a 23-day periodicity during a large flare in 1997 for X-ray data of Xray satellite RXTE all sky monitor (ASM), 2-TeV gamma ray data from Utah Seven Telescope and HEGRA, with a Fourier analysis.
TL;DR: In this article, the results of 3-D Monte Carlo simulations of a CZT calorimeter that can be used to detect photons in the keV to several MeV range are presented.
TL;DR: In this article, the effects of classical gravitational radiation in models with large extra dimensions are investigated for ultra high energy cosmic rays (CRs), and the cross sections are implemented into a simulation package (SENECA) for high energy hadron induced CR air showers.
TL;DR: In this article, a comparative analysis of the Cherenkov light produced by electromagnetic air showers initiated by primary gamma-rays and electrons is presented, and it is shown that the lateral distribution functions of the light initiated by these showers are different.
TL;DR: The PAMELA space experiment will be launched on-board of a Russian Resurs DK1 satellite towards the end of 2005 and the main scientific goal is the study of the antimatter component of the cosmic radi...
TL;DR: In this article, the muon flux at the South Pole was measured for five zenith angles, 0°, 15°, 35°, 82.13° and 85.15° with a scintillator muon telescope incorporating ice Cherenkov tank detectors as the absorber.
TL;DR: In this article, principal components analysis (PCA) was used to discriminate gamma ray induced air showers from proton simulated extensive air showers and a cutting parameter was calculated, and the efficiency of the cutting procedure for γ-proton separation was evaluated under experimental conditions.
TL;DR: In this article, a direct measurement of the expected mean number of protons and iron by comparing the shapes of expected X max distributions to the distribution for data is presented. But the results are limited to a single parent sample.
TL;DR: In this paper, the average source injection spectra from an ensemble of supernova remnant (SNR) is calculated both in the inner (330°) and outer (200°) regions of the galaxy.
TL;DR: In this paper, the authors estimate the detection energy threshold of a large diameter atmospheric Cherenkov telescope with respect to the diffuse cosmic ray electrons and show that the detection threshold of cosmic ray electron induced showers is higher than that for primary gamma showers due to the differences in the development of electromagnetic air showers initiated by these primaries.
TL;DR: In this paper, the L3+C muon detector at the CERN electron-positron collider, LEP, is used for the detection of very high-energy cosmic gamma-ray sources through the observation of muons of energies above 20, 30, 50 and 100 GeV.
TL;DR: In this paper, the authors study the deflection of charged cosmic-ray particles by the regular component of the Galactic magnetic field (GMF) and find which deflection would not destroy the cluster and possibly make it tighter.
TL;DR: In this article, the authors describe the AMICA sub-system, the accommodation/integration issues and the in-flight alignment procedure adopting identified galactic (Pulsars) and extra-galactic (AGNs) sources.
TL;DR: In this paper, the authors calculate the fluorescence photon yield of an electron in air using the energy spectrum of particles in the air as a function of age, and study the fluctuations of the yield resultant from different atmospheric conditions.