Year of publication
- L’institution de la littérature gabonaise : Partie I (2005)
- Depuis bientôt trois (3) ans, le Docteur Heméry-Hervais SIMA-EYI enseignant et directeur en outre, du Centre d’études pour la littérature gabonaise(CELIG) anime à la faculté des lettres et des sciences humaines, notamment au sein du département des Littératures Africaines de l’Université Omar Bongo, un séminaire intitulé « Littérature et société au Gabon » . Ce séminaire vise à étudier, analyser la littérature gabonaise dans ses rapports apparents avec la société dans laquelle cette littérature est produite. Pour ce faire, le Docteur SIMA-EYI a demandé à ses étudiants de voir, dans l’optique d’un colloque sur la littérature gabonaise , quelle place les institutions littéraires(maisons d’éditions, universités, centres de recherche, ministères, etc.)accordent à la littérature produite dans notre pays . Ainsi, scindée en deux(2) groupes,l’un dirigé par Guy Wilfried IDIATHA et l’autre par Désiré Clitandre DZONTEU, la classe de licence des Littératures Africaines s’est donc penchée sur cet épineux problème. Notre équipe s’est intéressée au groupe bancaire BICIG et son concours littéraire et artistique ; au Théâtre national ; aux maisons d’éditions entre autres, La Maison Gabonaise du Livre, Ndzé, Hilaire Makaya et les éditions du silence ; l’Union des écrivains gabonais(UDEG), l’Ecole Normale supérieure(ENS) et l’organisation des Nations unies pour l’éducation , la science et la culture(UNESCO). Il est sans rappelé que ce travail ne fut pas une sinécure, plutôt parfois un parcours du combattant. -------------------------------------------------------------------------------------------- CRELAF (Cercle de Reflexion des Etudiants en Littératures Africaines), Département de Littératures Africaines, Université Omar Bongo, Gabon
- Elliptic Flow in Au+Au Collisions at sqrt sNN = 130 GeV (2001)
- Elliptic flow from nuclear collisions is a hadronic observable sensitive to the early stages of system evolution. We report first results on elliptic flow of charged particles at midrapidity in Au+Au collisions at sqrt[sNN] = 130 GeV using the STAR Time Projection Chamber at the Relativistic Heavy Ion Collider. The elliptic flow signal, v2, averaged over transverse momentum, reaches values of about 6% for relatively peripheral collisions and decreases for the more central collisions. This can be interpreted as the observation of a higher degree of thermalization than at lower collision energies. Pseudorapidity and transverse momentum dependence of elliptic flow are also presented.
- Pion-kaon correlations in central Au+Au collisions at sqrt[sNN]=130 GeV (2003)
- Pion-kaon correlation functions are constructed from central Au+Au STAR data taken at sqrt[sNN]=130 GeV by the STAR detector at the Relativistic Heavy Ion Collider (RHIC). The results suggest that pions and kaons are not emitted at the same average space-time point. Space-momentum correlations, i.e., transverse flow, lead to a space-time emission asymmetry of pions and kaons that is consistent with the data. This result provides new independent evidence that the system created at RHIC undergoes a collective transverse expansion.
- Transverse-momentum and collision-energy dependence of high-pT hadron suppression in Au+Au collisions at ultrarelativistic energies (2003)
- We report high statistics measurements of inclusive charged hadron production in Au+Au and p+p collisions at sqrt[sNN]=200 GeV. A large, approximately constant hadron suppression is observed in central Au+Au collisions for 5<pT<12 GeV/c. The collision energy dependence of the yields and the centrality and pT dependence of the suppression provide stringent constraints on theoretical models of suppression. Models incorporating initial-state gluon saturation or partonic energy loss in dense matter are largely consistent with observations. We observe no evidence of pT-dependent suppression, which may be expected from models incorporating jet attenuation in cold nuclear matter or scattering of fragmentation hadrons.
- Net charge fluctuations in Au+Au collisions at sqrt[sNN ]=130 GeV (2003)
- We present the results of charged particle fluctuations measurements in Au+Au collisions at sqrt[sNN ]=130 GeV using the STAR detector. Dynamical fluctuations measurements are presented for inclusive charged particle multiplicities as well as for identified charged pions, kaons, and protons. The net charge dynamical fluctuations are found to be large and negative providing clear evidence that positive and negative charged particle production is correlated within the pseudorapidity range investigated. Correlations are smaller than expected based on model-dependent predictions for a resonance gas or a quark-gluon gas which undergoes fast hadronization and freeze-out. Qualitative agreement is found with comparable scaled p+p measurements and a heavy ion jet interaction generation model calculation based on independent particle collisions, although a small deviation from the 1/N scaling dependence expected from this model is observed.
- Evidence from d+Au measurements for final-state suppression of high-pT hadrons in Au+Au collisions at RHIC (2003)
- We report measurements of single-particle inclusive spectra and two-particle azimuthal distributions of charged hadrons at high transverse momentum (high pT) in minimum bias and central d+Au collisions at sqrt[sNN]=200 GeV. The inclusive yield is enhanced in d+Au collisions relative to binary-scaled p+p collisions, while the two-particle azimuthal distributions are very similar to those observed in p+p collisions. These results demonstrate that the strong suppression of the inclusive yield and back-to-back correlations at high pT previously observed in central Au+Au collisions are due to final-state interactions with the dense medium generated in such collisions.
- Three-pion Hanbury Brown-Twiss correlations in relativistic heavy-ion collisions from the STAR experiment (2003)
- Data from the first physics run at the Relativistic Heavy-Ion Collider at Brookhaven National Laboratory, Au+Au collisions at sqrt[sNN]=130 GeV, have been analyzed by the STAR Collaboration using three-pion correlations with charged pions to study whether pions are emitted independently at freeze-out. We have made a high-statistics measurement of the three-pion correlation function and calculated the normalized three-particle correlator to obtain a quantitative measurement of the degree of chaoticity of the pion source. It is found that the degree of chaoticity seems to increase with increasing particle multiplicity.
- Narrowing of the Balance Function with Centrality in Au+Au Collisions at sqrt[sNN]=130 GeV (2003)
- The balance function is a new observable based on the principle that charge is locally conserved when particles are pair produced. Balance functions have been measured for charged particle pairs and identified charged pion pairs in Au+Au collisions at sqrt[sNN]=130 GeV at the Relativistic Heavy Ion Collider using STAR. Balance functions for peripheral collisions have widths consistent with model predictions based on a superposition of nucleon-nucleon scattering. Widths in central collisions are smaller, consistent with trends predicted by models incorporating late hadronization.
- Event-wise <pt> fluctuations in Au-Au collisions at sqrt[sNN]=130 GeV (2005)
- We present the first large-acceptance measurement of event-wise mean transverse momentum <pt> fluctuations for Au-Au collisions at nucleon-nucleon center-of-momentum collision energy sqrt[sNN] = 130 GeV. The observed nonstatistical <pt> fluctuations substantially exceed in magnitude fluctuations expected from the finite number of particles produced in a typical collision. The r.m.s. fractional width excess of the event-wise <pt> distribution is 13.7±0.1(stat) ±1.3(syst)% relative to a statistical reference, for the 15% most-central collisions and for charged hadrons within pseudorapidity range | eta |<1,2 pi azimuth, and 0.15 <= pt <= 2 GeV/c. The width excess varies smoothly but nonmonotonically with collision centrality and does not display rapid changes with centrality which might indicate the presence of critical fluctuations. The reported <pt> fluctuation excess is qualitatively larger than those observed at lower energies and differs markedly from theoretical expectations. Contributions to <pt> fluctuations from semihard parton scattering in the initial state and dissipation in the bulk colored medium are discussed.
- Azimuthally sensitive Hanbury Brown-Twiss interferometry in Au+Au collisions at sqrt[sNN]=200 GeV (2004)
- We present the results of a systematic study of the shape of the pion distribution in coordinate space at freeze-out in Au+Au collisions at BNL RHIC using two-pion Hanbury Brown-Twiss (HBT) interferometry. Oscillations of the extracted HBT radii versus emission angle indicate sources elongated perpendicular to the reaction plane. The results indicate that the pressure and expansion time of the collision system are not sufficient to completely quench its initial shape.