Search results for " Pierre"
showing 10 items of 83 documents
Observation of the suppression of the flux of cosmic rays above 4x10^19eV
2008
The energy spectrum of cosmic rays above 2.5 × 10¹⁸ eV, derived from 20,000 events recorded at the Pierre Auger Observatory, is described. The spectral index γ of the particle flux, J ∝ E-γ, at energies between 4 × 10¹⁸ eV and 4 × 10¹⁹ eV is 2.69 ± 0.02(stat) ± 0.06(syst), steepening to 4.2 ± 0.4(stat) ± 0.06(syst) at higher energies. The hypothesis of a single power law is rejected with a significance greater than 6 standard deviations. The data are consistent with the prediction by Greisen and by Zatsepin and Kuz'min.
Upper limit on the diffuse flux of ultrahigh energy tau neutrinos from the Pierre Auger Observatory
2008
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau neutrinos that interact in Earth’s crust. Tau leptons from ντ charged-current interactions can emerge and decay in the atmosphere to produce a nearly horizontal shower with a significant electromagnetic component. The data collected between 1 January 2004 and 31 August 2007 are used to place an upper limit on the diffuse flux of ντ at EeV energies. Assuming an E−2ν differential energy spectrum the limit set at 90% C.L. is E2νdNντdEν<1.3×10−7 GeV cm−2 s−1 sr−1 in the energy range 2×1017 eV<E<2×1019 eV.
Large-scale distribution of arrival directions of cosmic rays detected above 1018 eV at the Pierre Auger Observatory
2012
A thorough search for large-scale anisotropies in the distribution of arrival directions of cosmic rays detected above 1018 eV at the Pierre Auger Observatory is presented. This search is performed as a function of both declination and right ascension in several energy ranges above 1018 eV, and reported in terms of dipolar and quadrupolar coefficients. Within the systematic uncertainties, no significant deviation from isotropy is revealed. Assuming that any cosmic-ray anisotropy is dominated by dipole and quadrupole moments in this energy range, upper limits on their amplitudes are derived. These upper limits allow us to test the origin of cosmic rays above 1018 eV from stationary Galactic …
Des signes lapidaires autour de l’An Mil sur les murs de l’église de Saint-Germain-des-Prés (Paris). Nouvelles données
2018
International audience
L’abbaye Saint-Germain : matériaux et techniques du bâti – Les matériaux de construction
2000
International audience
Massangis, Vau Chevrau et La Côme Gérarde (Yonne) : centrale photovoltaïque, zone 3 nord et zone 5 : rapport de diagnostic
2012
L’opération n’a révélé que peu de vestiges en raison de l’érosion générale subie par les niveaux en sommet de plateau. Toutefois, quelques ensembles archéologiques méritent d’être notés.Si la protohistoire ancienne n’est que peu représentée (un enclos circulaire très arasé), la période de La Tène Finale et l’époque gallo-romaine sont, quant à elles, un peu mieux connues. On note en effet la présence d’une voie antique est-ouest repérée sur environ 130 m, sans doute en grande partie érodée de part et d’autre de ce tronçon.En bordure nord et sud, deux pôles funéraires, totalement inédits, sont installés dès La Tène Finale et fonctionnent visiblement jusqu’à l’époque flavienne. Ils sont marqué…
La mémoire de Pierre Semard chez les cheminots CGT
2007
L'Estoil(l)e Pierre de
2007
Qu'est-ce que le structuralisme génétique ?
2021
International audience
BORDERS AND BORDER CROSSING BETWEEN ART WORLDS. Successful attempts and epic failures to enter new domains in recent British art
2016
The paper attempts to answer, whether it is possible for successful artists in one specific sector to access the domain of another artistic field at their free will. In doing so, this contribution analyses the possible existence of borders and gatekeepers between different art worlds. The aim is not just finding or defining boundaries between art fields, but rather understanding, if boundaries can be pierced through, as well as the conditions that might hinder acceptance. Moving from an art theoretical and philosophical perspective, the present paper will discuss the thesis of Pierre Bourdieu, Howard Becker, Berys Gaut and Joseph Margolis on boundary conditions in the arts. Subsequently the…