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  1. High-precision measurement of total fission cross sections in spallation reactions of 208Pb and 238U
    Autor*in: Schmidt, K.-H.; Jurado, B.; Pleskac, R.; Ricciardi, M. V.; Benlliure, J.; Enqvist, T.; Farget, F.,; Bacquias, A.; Giot, Lydie; Henzl, V.; Henzlova, D.; Kelic-Heil, A.; Leray, S.; Lukic, S.; Ngoc, Son Nguyen; Boudard, A.; Casarejos, E.; Fernandez, M.; Kurtukian Nieto, T.; Nadtochy, P.; Perez, D.; Schmitt, C.
    Erschienen: 2013
    Verlag:  HAL CCSD ; American Physical Society

    18 pages, 12 figures, expérience au GSI, SUBATECH-Erdre ; Total cross sections for proton- and deuteron-induced-fission of 208Pb and 238U have been determined in the energy range between 500 MeV and 1 GeV. The experiment has been performed in inverse... mehr

     

    18 pages, 12 figures, expérience au GSI, SUBATECH-Erdre ; Total cross sections for proton- and deuteron-induced-fission of 208Pb and 238U have been determined in the energy range between 500 MeV and 1 GeV. The experiment has been performed in inverse kinematics at GSI Darmstadt, facilitating the counting of the projectiles and the identification of the reaction products. High precision between 5 and 7 percent has been achieved by individually counting the beam particles and by registering both fission fragments in coincidence with high efficiency and full Z resolution. Fission was clearly distinguished from other reaction channels. The results were found to deviate by up to 30 percent from Prokofiev's systematics on total fission cross sections. There is good agreement with an elaborate experiment performed in direct kinematics.

     
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    Übergeordneter Titel: ISSN: 2469-9985 ; EISSN: 2469-9993 ; Physical Review C ; https://hal.in2p3.fr/in2p3-00726669 ; Physical Review C, 2013, 87, pp.034601. ⟨10.1103/PhysRevC.87.034601⟩
    Schlagworte: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  2. New antineutrino energy spectra predictions from the summation of beta decay branches of the fission products
    Autor*in: Fallot, Muriel; Cormon, S.; Estienne, Magali; Algora, A.; Bui, Van Minh; Cucoanes, A.; Elnimr, M.; Giot, Lydie; Jordan, D.; Martino, J.; Onillon, A.; Porta, Amanda; Pronost, G.; Remoto, A.; Taín, J.L.; Yermia, Frédéric; Zakari-Issoufou, A.-A.
    Erschienen: 2012
    Verlag:  HAL CCSD ; American Physical Society

    10 pages, 2 figures ; In this paper, we study the impact of the inclusion of the recently measured beta decay properties of the $^{102;104;105;106;107}$Tc, $^{105}$Mo, and $^{101}$Nb nuclei in an updated calculation of the antineutrino energy spectra... mehr

     

    10 pages, 2 figures ; In this paper, we study the impact of the inclusion of the recently measured beta decay properties of the $^{102;104;105;106;107}$Tc, $^{105}$Mo, and $^{101}$Nb nuclei in an updated calculation of the antineutrino energy spectra of the four fissible isotopes $^{235, 238}$U, and $^{239,241}$Pu. These actinides are the main contributors to the fission processes in Pressurized Water Reactors. The beta feeding probabilities of the above-mentioned Tc, Mo and Nb isotopes have been found to play a major role in the $\gamma$ component of the decay heat of $^{239}$Pu, solving a large part of the $\gamma$ discrepancy in the 4 to 3000\,s range. They have been measured using the Total Absorption Technique (TAS), avoiding the Pandemonium effect. The calculations are performed using the information available nowadays in the nuclear databases, summing all the contributions of the beta decay branches of the fission products. Our results provide a new prediction of the antineutrino energy spectra of $^{235}$U, $^{239,241}$Pu and in particular of $^{238}$U for which no measurement has been published yet. We conclude that new TAS measurements are mandatory to improve the reliability of the predicted spectra.

     
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    Übergeordneter Titel: ISSN: 0031-9007 ; EISSN: 1079-7114 ; Physical Review Letters ; http://hal.in2p3.fr/in2p3-00734002 ; Physical Review Letters, American Physical Society, 2012, 109, pp.202504. ⟨10.1103/PhysRevLett.109.202504⟩
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  3. Inclusive cross section and single-transverse-spin asymmetry for very forward neutron production in polarized p+p collisions at sqrt(s)=200 GeV
    Autor*in: Adare, A.; Aphecetche, Laurent; Hadj Henni, A.; Atomssa, E. T.; D'Enterria, D.; Drapier, O.; Fleuret, F.; Gonin, M.; Granier De Cassagnac, R.; Rakotozafindrabe, A.; Tram, V.-N.; Roche, G.; Rosnet, P.
    Erschienen: 2012
    Verlag:  HAL CCSD ; American Physical Society

    see paper for full list of authors - 383 authors, 16 pages, 18 figures, 6 tables. Submitted to Phys. Rev. D. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at... mehr

     

    see paper for full list of authors - 383 authors, 16 pages, 18 figures, 6 tables. Submitted to Phys. Rev. D. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at www.phenix.bnl.gov/papers.html ; The energy dependence of the single-transverse-spin asymmetry, A_N, and the cross section for neutron production at very forward angles were measured in the PHENIX experiment at RHIC for polarized p+p collisions at sqrt(s)=200 GeV. The neutrons were observed in forward detectors covering an angular range of up to 2.2 mrad. We report results for neutrons with momentum fraction of x_F=0.45 to 1.0. The energy dependence of the measured cross sections were consistent with x_F scaling, compared to measurements by an ISR experiment which measured neutron production in unpolarized p+p collisions at sqrt(s)=30.6--62.7 GeV. The cross sections for large x_F neutron production for p+p collisions, as well as those in e+p collisions measured at HERA, are described by a pion exchange mechanism. The observed forward neutron asymmetries were large, reaching A_N=-0.08+/-0.02 for x_F=0.8; the measured backward asymmetries, for negative x_F, were consistent with zero. The observed asymmetry for forward neutron production is discussed within the pion exchange framework, with interference between the spin-flip amplitude due to the pion exchange and nonflip amplitudes from all Reggeon exchanges. Within the pion exchange description, the measured neutron asymmetry is sensitive to the contribution of other Reggeon exchanges even for small amplitudes.

     
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    Übergeordneter Titel: ISSN: 1550-7998 ; EISSN: 1550-2368 ; Physical Review D ; http://hal.in2p3.fr/in2p3-00734009 ; Physical Review D, American Physical Society, 2012, 88, pp.032006. ⟨10.1103/PhysRevD.88.032006⟩
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  4. Erratum: Measurement of transverse single-spin asymmetries for J/psi production in polarized p+p collisions at sqrt(s)=200 GeV [Phys. Rev. D 82, 112008 (2010)]
    Autor*in: Adare, A.; Aphecetche, Laurent; Atomssa, E. T.; Baldisseri, A.; Borel, H.; Charvet, J. -L.; del Valle, Z. Conesa; Dahms, T.; Drapier, O.; Fleuret, F.; Gonin, M.; Gosset, J.; de Cassagnac, R. Granier; Henni, A. Hadj; Jouan, D.; Nguyen, M.; Pereira, H.; Rakotozafindrabe, A.; Tram, V-N.; Roche, G.; Rosnet, P.
    Erschienen: 2012
    Verlag:  HAL CCSD ; American Physical Society

    431 authors from 62 institutions, 3 pages, 2 figures, and 3 tables. Erratum submitted to Physical Review D, see paper for full list of authors ; International audience ; We previously reported [Phys. Rev. D 82, 112008 (2010)] measurements of... mehr

     

    431 authors from 62 institutions, 3 pages, 2 figures, and 3 tables. Erratum submitted to Physical Review D, see paper for full list of authors ; International audience ; We previously reported [Phys. Rev. D 82, 112008 (2010)] measurements of transverse single-spin asymmetries, A_N, in J/psi production from transversely polarized p+p collisions at sqrt(s)=200 GeV with data taken by the PHENIX experiment at the Relativistic Heavy Ion Collider in 2006 and 2008. Subsequently, we have found errors in the analysis procedures for the 2008 data, which resulted in an erroneous value for the extracted A_N. The errors affected the sorting of events into the correct left/right and forward/backward bins. This produced an incorrect value for the 2008 result, but the 2006 result is unaffected. We have conducted two independent reanalyses with these errors corrected, and we present here the corrected values for the 2008 data and the combined results for 2006 and 2008. The new combined spin asymmetry in the forward region is A_N = -0.026+/-0.026(stat)+/-0.003(sys). Since this asymmetry is consistent with zero, we no longer claim that our results suggest a possible non-zero trigluon correlation function in transversely polarized protons.

     
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    Übergeordneter Titel: ISSN: 1550-7998 ; EISSN: 1550-2368 ; Physical Review D ; https://hal.in2p3.fr/in2p3-00745786 ; Physical Review D, American Physical Society, 2012, 86, pp.099904. ⟨10.1103/PhysRevD.86.099904⟩
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
  5. Alpha localized radiolysis and corrosion mechanisms at the iron/water interface: Role of molecular species
    Autor*in: Vandenborre, Johan; Crumière, F.; Blain, G.; Essehli, R.; Humbert, Bernard; Fattahi, M.
    Erschienen: 2013
    Verlag:  HAL CCSD ; Elsevier

    This paper is devoted to the iron corrosion phenomena induced by the α (4He2+) water radiolysis species studied in conjunction with the production/consumption of H2 at the solid/solution interface. On one hand, the solid surface is characterized... mehr

     

    This paper is devoted to the iron corrosion phenomena induced by the α (4He2+) water radiolysis species studied in conjunction with the production/consumption of H2 at the solid/solution interface. On one hand, the solid surface is characterized during the 4He2+ ions irradiation by in situ Raman spectroscopy; on another hand, the H2 gas produced by the water radiolysis is monitored by ex situ gas measurements. The 4He2+ ions irradiation experiments are provided either by the CEMHTI (E = 5.0 MeV) either by the ARRONAX (E = 64.7 MeV) cyclotron facilities. The iron corrosion occurs only under irradiation and can be slowed down by H2 reductive atmosphere. Pure iron and carbon steel solids are studied in order to show two distinct behaviors of these surfaces vs. the 4He2+ ions water irradiation: the corrosion products identified are the magnetite phase (Fe(II)Fe(III)2O4) correlated to an H2 consumption for pure iron and the lepidocrocite phase (γ-Fe(III)OOH) correlated to an H2 production for carbon steel sample. This paper underlined the correlation between the iron corrosion products formation onto the solid surface and the H2 production/consumption mechanisms. H2O2 species is considered as the single water radiolytic species involved into the corrosion reaction at the solid surface with an essential role in the oxidation reaction of the iron surface. We propose to bring some light to these mechanisms, in particular the H2 and H2O2 roles, by the in situ Raman spectroscopy during and after the 4He2+ ions beam irradiation. This in situ experiment avoids the evolution of the solid surface, in particular phases which are reactive to the oxidation processing.

     
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    Übergeordneter Titel: ISSN: 0022-3115 ; EISSN: 0022-3115 ; Journal of Nuclear Materials ; https://hal.in2p3.fr/in2p3-00748578 ; Journal of Nuclear Materials, 2013, 433, pp.124-131. ⟨10.1016/j.jnucmat.2012.09.034⟩
    Schlagworte: [CHIM.RADIO]Chemical Sciences/Radiochemistry
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    info:eu-repo/semantics/OpenAccess
  6. Upsilon (1S+2S+3S) production in d+Au and p+p collisions at sqrt(s_NN)=200 GeV and cold-nuclear matter effects
    Autor*in: Adare, A.; Atomssa, E. T.; Conesa del Valle, Z.; d'Enterria, D.; Drapier, O.; Fleuret, F.; Gonin, M.; Granier de Cassagnac, R.; Rakotozafindrabe, A.; Tram, V.N.; Aphecetche, Laurent; Hadj Henni, A.; Roche, G.; Rosnet, P.; Jouan, D.
    Erschienen: 2012
    Verlag:  HAL CCSD ; American Physical Society

    see paper for full list of authors, 495 authors, 11 pages, 9 figures, 5 tables. Submitted to Phys. Rev. C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at... mehr

     

    see paper for full list of authors, 495 authors, 11 pages, 9 figures, 5 tables. Submitted to Phys. Rev. C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at www.phenix.bnl.gov/papers.html ; The three Upsilon states, Upsilon(1S+2S+3S), are measured in d+Au and p+p collisions at sqrt(s_NN)=200 GeV and rapidities 1.2<|y|<2.2 by the PHENIX experiment at the Relativistic Heavy-Ion Collider. Cross sections for the inclusive Upsilon(1S+2S+3S) production are obtained. The inclusive yields per binary collision for d+Au collisions relative to those in p+p collisions (R_dAu) are found to be 0.62 +/- 0.26 (stat) +/- 0.13 (syst) in the gold-going direction and 0.91 +/- 0.33 (stat) +/- 0.16 (syst) in the deuteron-going direction. The measured results are compared to a nuclear-shadowing model, EPS09 [JHEP 04, 065 (2009)], combined with a final-state breakup cross section, sigma_br, and compared to lower energy p+A results. We also compare the results to the PHENIX J/psi results [Phys. Rev. Lett. 107, 142301 (2011)]. The rapidity dependence of the observed Upsilon suppression is consistent with lower energy p+A measurements.

     
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    Übergeordneter Titel: ISSN: 0031-9007 ; EISSN: 1079-7114 ; Physical Review Letters ; http://hal.in2p3.fr/in2p3-00756698 ; Physical Review Letters, American Physical Society, 2012, 109, pp.242301. &#x27E8;10.1103/PhysRevLett.109.242301&#x27E9;
    Schlagworte: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  7. LET effects on the hydrogen production induced by the radiolysis of pure water
    Autor*in: Crumière, F.; Vandenborre, Johan; Essehli, R.; Blain, G.; Barbet, J.; Fattahi, M.
    Erschienen: 2013
    Verlag:  HAL CCSD ; Elsevier

    Radiation chemical primary yields g(H2) have been determined for irradiations performed with 60Co γ-rays source of LCP (Orsay, France) and with helium ion beams (Eα=5.0 MeV-64.7 MeV) using protective agent bromide anions in solution. The α (4He2+)... mehr

     

    Radiation chemical primary yields g(H2) have been determined for irradiations performed with 60Co γ-rays source of LCP (Orsay, France) and with helium ion beams (Eα=5.0 MeV-64.7 MeV) using protective agent bromide anions in solution. The α (4He2+) irradiation experiments were performed either at CEMHTI or at the new ARRONAX cyclotron facility (2010). Both sources (γ and cyclotrons) allow working with a large LET value range between 0.23 and 151.5 keV/μm. On one hand, the obtained results have been compared with those available in the literature and plotted as a function of the LET parameter in order to discuss the effects of track structure on the production of molecular hydrogen. On the other hand, the primary radiation chemistry yield g(H2) values are compared with global radiation chemical yields G(H2) obtained during irradiations of pure water irradiated under air or argon without scavenging. For each system, it appears that radiation chemical yields increase with the LET value. Our results suggest that using bromide anions, at low concentration, as a protective agent becomes ineffective when the LET value used is higher than 120±20 keV/μm.

     
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    Übergeordneter Titel: ISSN: 0969-806X ; Radiation Physics and Chemistry ; http://hal.in2p3.fr/in2p3-00759933 ; Radiation Physics and Chemistry, Elsevier, 2013, 82, pp.74-79. &#x27E8;10.1016/j.radphyschem.2012.07.010&#x27E9;
    Schlagworte: [CHIM.RADIO]Chemical Sciences/Radiochemistry
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    info:eu-repo/semantics/OpenAccess
  8. Transverse momentum dependence of J/ψ polarization at midrapidity in p+p collisions at √s=200 GeV
    Autor*in: Adare, A.; P. Comets, M.; Jouan, D.; Suire, C.; Roche, G.; Rosnet, P.; Gosset, J.; Staley, F.; Delagrange, H.; Hadj Henni, A.; Conesa del Valle, Z.; Drapier, O.; Fleuret, F.; Gonin, M.; Granier de Cassagnac, R.; Rakotozafindrabe, A.; Tram, V.-N.
    Erschienen: 2010
    Verlag:  HAL CCSD ; American Physical Society

    See paper for full list of authors ; We report the measurement of the transverse momentum dependence of inclusive J/ψ polarization in p+p collisions at √s=200 GeV performed by the PHENIX Experiment at the Relativistic Heavy Ion Collider. The J/ψ... mehr

     

    See paper for full list of authors ; We report the measurement of the transverse momentum dependence of inclusive J/ψ polarization in p+p collisions at √s=200 GeV performed by the PHENIX Experiment at the Relativistic Heavy Ion Collider. The J/ψ polarization is studied in the helicity, Gottfried-Jackson, and Collins-Soper frames for pT<5 GeV/c and |y|<0.35. The polarization in the helicity and Gottfried-Jackson frames is consistent with zero for all transverse momenta, with a slight (1.8 sigma) trend towards longitudinal polarization for transverse momenta above 2 GeV/c. No conclusion is allowed due to the limited acceptance in the Collins-Soper frame and the uncertainties of the current data. The results are compared to observations for other collision systems and center of mass energies and to different quarkonia production models.

     
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    Übergeordneter Titel: ISSN: 1550-7998 ; EISSN: 1550-2368 ; Physical Review D ; https://hal.in2p3.fr/in2p3-00760878 ; Physical Review D, American Physical Society, 2010, 10.1103/PhysRevD.82.012001, pp.012001
    Schlagworte: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  9. Long-range angular correlations on the near and away side in p-Pb collisions at sqrt(sNN) = 5.02 TeV
    Autor*in: Abelev, B.; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Vernet, R.; Belikov, I.; Hippolyte, B.; Kuhn, C.; Molnar, L.; Roy, C.; Sanchez Castro, X.; Senyukov, S.; Aphecetche, Laurent; Batigne, Guillaume; Bergognon, E.; Bregant, M.; Delagrange, H.; Driga, O.; Erazmus, B.; Estienne, Magali; Germain, Marie; Lardeux, A.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Matyja, A.; Pillot, Philippe; Schutz, y.; Shabetai, Alexandre; Stocco, Diego; Cheshkov, C.; Cheynis, B.; Ducroux, L.; Guilbaud, Maxime; Tieulent, R.; Uras, A.; Zoccarato, y.; Baek, y.W.; Barret, V.; Bastid, N.; Crochet, P.; Dupieux, P.; Ichou, R.; Lopez, X.; Manso, F.
    Erschienen: 2013
    Verlag:  HAL CCSD ; Elsevier

    See paper for full list of authors - 22 pages, 5 figures, author list from page 16; submitted to PLB ; Angular correlations between charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon... mehr

     

    See paper for full list of authors - 22 pages, 5 figures, author list from page 16; submitted to PLB ; Angular correlations between charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV for transverse momentum ranges within 0.5 < pT,assoc < pT,trig < 4 GeV/c. The correlations are measured over two units of pseudorapidity and full azimuthal angle in different intervals of event multiplicity, and expressed as associated yield per trigger particle. Two long-range ridge-like structures, one on the near side and one on the away side, are observed when the per-trigger yield obtained in low-multiplicity events is subtracted from the one in high-multiplicity events. The excess on the near-side is qualitatively similar to that recently reported by the CMS collaboration, while the excess on the away-side is reported for the first time. The two-ridge structure projected onto azimuthal angle is quantified with the second and third Fourier coefficients as well as by near-side and away-side yields and widths. The yields on the near side and on the away side are equal within the uncertainties for all studied event multiplicity and pT bins, and the widths show no significant evolution with event multiplicity or pT. These findings suggest that the near-side ridge is accompanied by an essentially identical away-side ridge.

     
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    Übergeordneter Titel: ISSN: 0370-2693 ; Physics Letters B ; http://hal.in2p3.fr/in2p3-00763590 ; Physics Letters B, Elsevier, 2013, 719, pp.29-41. &#x27E8;10.1016/j.physletb.2013.01.012&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  10. On the hydrogen bonding structure at the aqueous interface of ammonium-substituted mica: A molecular dynamics simulation
    Autor*in: Narasimhan, L.; Kalinichev, Andrey G.
    Erschienen: 2013
    Verlag:  HAL CCSD ; Verlag der Zeitschrift Fuer Naturforschung

    Molecular dynamics (MD) computer simulations were performed for an aqueous film of 3nm thickness adsorbed at the (001) surface of ammonium-substituted muscovite mica. The results provide a detailed picture of the near-surface structure and... mehr

     

    Molecular dynamics (MD) computer simulations were performed for an aqueous film of 3nm thickness adsorbed at the (001) surface of ammonium-substituted muscovite mica. The results provide a detailed picture of the near-surface structure and topological characteristics of the interfacial hydrogen bonding network. The effects of D/H isotopic substitution in N(H/D)4+ on the dynamics and consequently on the convergence of the structural properties have also been explored. Unlike many earlier simulations, a much larger surface area representing 72 crystallographic unit cells was used, which allowed for a more realistic representation of the substrate surface with a more disordered distribution of Al/Si isomorphic substitutions in muscovite. The results clearly demonstrate that under ambient conditions both interfacial ammonium ions and the very first layer of water molecules are H-bonded only to the basal surface of muscovite, but do not form H-bonds with each other. As the distance from the surface increases, the H-bonds donated to the surface by both N(H/D)4+ and H2O are gradually replaced by the H-bonds to the neighboring water molecules, with the ammonia ions experiencing one reorientational transition region, while the H2O molecules experiencing three such distinct consecutive transitions. The hydrated N(H/D)4+ ions adsorb almost exclusively as inner-sphere surface complexes with the preferential coordination to the basal bridging oxygen atoms surrounding the Al/Si substitutions.

     
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    Übergeordneter Titel: ISSN: 0932-0784 ; Zeitschrift fur Naturforschung a ; http://hal.in2p3.fr/in2p3-00768710 ; Zeitschrift fur Naturforschung a, Verlag der Zeitschrift Fuer Naturforschung, 2013, 68, pp.91-100. &#x27E8;10.5560/ZNA.2012-0101&#x27E9;
    Schlagworte: [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry
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  11. Molecular models of natural organic matter and its colloidal aggregation in aqueous solutions: Challenges and opportunities for computer simulations
    Autor*in: Kalinichev, Andrey G.
    Erschienen: 2012
    Verlag:  HAL CCSD ; De Gruyter

    Natural organic matter (NOM) is ubiquitous in soil and groundwater and its aqueous complexation with various inorganic and organic species can strongly affect the speciation, solubility and toxicity of many elements in the environment. Despite... mehr

     

    Natural organic matter (NOM) is ubiquitous in soil and groundwater and its aqueous complexation with various inorganic and organic species can strongly affect the speciation, solubility and toxicity of many elements in the environment. Despite significant geochemical, environmental and industrial interest, the molecular-scale mechanisms of the physical and chemical processes involving NOM are not yet fully understood. Recent molecular dynamics (MD) simulations using relatively simple models of NOM fragments are used here to illustrate the challenges and opportunities for the application of computational molecular modeling techniques to the structural, dynamic, and energetic characterization of metal-NOM complexation and colloidal aggregation in aqueous solutions. The predictions from large-scale MD simulations are in good qualitative agreement with available experimental observations, but also point out to the need for simulations at much larger time and length scales with more complex NOM models in order to fully capture the diversity of molecular processes involving NOM.

     
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    Übergeordneter Titel: ISSN: 0033-4545 ; EISSN: 1365-3075 ; Pure and Applied Chemistry ; http://hal.in2p3.fr/in2p3-00769189 ; Pure and Applied Chemistry, De Gruyter, 2012, &#x27E8;10.1351/PAC-CON-12-05-11&#x27E9;
    Schlagworte: [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry; [SDE.IE]Environmental Sciences/Environmental Engineering; [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry; [SDE.MCG]Environmental Sciences/Global Changes
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  12. Metal cation complexation with natural organic matter in aqueous solutions: Molecular dynamics simulations and potentials of mean force
    Autor*in: Iskrenova-Tchoukova, E.; Kalinichev, Andrey G.; Kirkpatrick, R. James
    Erschienen: 2010
    Verlag:  HAL CCSD ; American Chemical Society

    Natural organic matter (NOM, or humic substance) has a known tendency to form colloidal aggregates in aqueous environments, with the composition and concentration of cationic species in solution, pH, temperature, and the composition of the NOM itself... mehr

     

    Natural organic matter (NOM, or humic substance) has a known tendency to form colloidal aggregates in aqueous environments, with the composition and concentration of cationic species in solution, pH, temperature, and the composition of the NOM itself playing important roles. Strong interaction of carboxylic groups of NOM with dissolved metal cations is thought to be the leading chemical interaction in NOM supramolecular aggregation. Computational molecular dynamics (MD) study of the interactions of Na+, Mg2+, and Ca2+ with the carboxylic groups of a model NOM fragment and acetate anions in aqueous solutions provides new quantitative insight into the structure, energetics, and dynamics of the interactions of carboxylic groups with metal cations, their association, and the effects of cations on the colloidal aggregation of NOM molecules. Potentials of mean force and the equilibrium constants describing overall ion association and the distribution of metal cations between contact ion pairs and solvent-separated ions pairs were computed from free MD simulations and restrained umbrella sampling calculations. The results provide insight into the local structural environments of metalâˆ'carboxylate association and the dynamics of exchange among these sites. All three cations prefer contact ion pair to solvent-separated ion pair coordination, and Na+ and Ca2+ show a strong preference for bidentate contact ion pair formation. The average residence time of a Ca2+ ion in a contact ion pair with the carboxylic groups is of the order of 0.5 ns, whereas the corresponding residence time of a Na+ ion is only between 0.02 and 0.05 ns. The average residence times of a Ca2+ ion in a bidentate coordinated contact ion pair vs a monodentate coordinated contact ion pair are about 0.5 and 0.08 ns, respectively. On the 10 ns time scale of our simulations, aggregation of the NOM molecules occurs in the presence of Ca2+ but not Na+ or Mg2+. These results agree with previous experimental observations and are explained by both Ca2+ ion bridging between NOM molecules and decreased repulsion between the NOM molecules due to the reduced net charge of the NOMâˆ'metal complexes. Simulations on a larger scale are needed to further explore the relative importance of the different aggregation mechanisms and the stability of NOM aggregates.

     
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    Übergeordneter Titel: ISSN: 0743-7463 ; EISSN: 1520-5827 ; Langmuir ; http://hal.in2p3.fr/in2p3-00769191 ; Langmuir, American Chemical Society, 2010, 26, pp.15909-15919. &#x27E8;10.1021/la102535n&#x27E9;
    Schlagworte: Natural organic matter; Supramolecular aggregation; Molecular dynamics simulations; potential of mean force; [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry; [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry; [SDE.MCG]Environmental Sciences/Global Changes
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  13. Charged kaon femtoscopic correlations in pp collisions at $\sqrt{s}=7$ TeV
    Autor*in: Abelev, B.; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Vernet, R.; Belikov, I.; Hippolyte, B.; Kuhn, C.; Molnar, L.; Roy, C.; Sanchez Castro, X.; Senyukov, S.; Aphecetche, Laurent; Batigne, Guillaume; Bergognon, E.; Bregant, M.; Delagrange, H.; Driga, O.; Erazmus, B.; Estienne, Magali; Germain, Marie; Lardeux, A.; Mas, A.; Massacrier, L.; Matyja, A.; Pillot, Philippe; Schutz, Y.; Shabetai, Alexandre; Stocco, Diego; Cheshkov, C.; Cheynis, B.; Ducroux, L.; Guilbaud, Maxime; Uras, A.; Tieulent, R.; Zoccarato, Y.; Baek, Y.W.; Barret, V.; Bastid, N.; Crochet, P.; Dupieux, P.; Ichou, R.; Lopez, X.; Manso, F.; Marchisone, M.; Porteboeuf-Houssais, S.; Rosnet, P.; Vulpescu, B.; Zhang, X.
    Erschienen: 2013
    Verlag:  HAL CCSD ; American Physical Society

    See paper for full list of authors - 16 pages, 4 figures ; Correlations of two charged identical kaons (Kch Kch) are measured in pp collisions at sqrt{s}=7 TeV by the ALICE experiment at the Large Hadron Collider (LHC). One-dimensional Kch Kch... mehr

     

    See paper for full list of authors - 16 pages, 4 figures ; Correlations of two charged identical kaons (Kch Kch) are measured in pp collisions at sqrt{s}=7 TeV by the ALICE experiment at the Large Hadron Collider (LHC). One-dimensional Kch Kch correlation functions are constructed in three multiplicity and four transverse momentum ranges. The Kch Kch femtoscopic source parameters R and lambda are extracted. The Kch Kch correlations show a slight increase of femtoscopic radii with increasing multiplicity and a slight decrease of radii with increasing transverse momentum. These trends are similar to the ones observed for pi pi and Ks0 Ks0 correlations in pp and heavy-ion collisions. However, the observed one dimensional correlation radii for charged kaons are larger at high multiplicities than those for pions in contrast to what was observed in heavy-ion collisions at RHIC.

     
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    Übergeordneter Titel: ISSN: 1550-7998 ; EISSN: 1550-2368 ; Physical Review D ; http://hal.in2p3.fr/in2p3-00769524 ; Physical Review D, American Physical Society, 2013, 87, pp.052016. &#x27E8;10.1103/PhysRevD.87.052016&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  14. Charge correlations using the balance function in Pb-Pb collisions at sqrt{s_{NN}} = 2.76 TeV
    Autor*in: Abelev, B.; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Vernet, R.; Belikov, I.; Hippolyte, B.; Kuhn, C.C.; Molnar, L.; Roy, C.S.; Sanchez Castro, X.; Aphecetche, Laurent; Batigne, Guillaume; Bergognon, E.; Bregant, M.; Delagrange, H.; Driga, O.; Erazmus, B.; Estienne, Magali; Germain, Marie; Lardeux, A.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Pillot, Philippe; Schutz, Y.; Shabetai, Alexandre; Stocco, Diego; Cheshkov, C.; Cheynis, B.; Ducroux, L.; Grossiord, J.-Y.; Guilbaud, Maxime; Tieulent, R.; Uras, A.; Zoccarato, Y.; Baek, Y.W.; Barret, V.; Bastid, N.; Crochet, P.; Dupieux, P.; Ichou, R.; Lopez, X.; Manso, F.; Marchisone, M.; Porteboeuf-Houssais, S.; Rosnet, P.; Vulpescu, B.; Zhang, X.
    Erschienen: 2013
    Verlag:  HAL CCSD ; Elsevier

    See paper for full list of authors - 37 pages, 7 figures, one column, author list until page 12, submitted to Physics Letters B ; In high-energy heavy-ion collisions, the correlations between the emitted particles can be used as a probe to gain... mehr

     

    See paper for full list of authors - 37 pages, 7 figures, one column, author list until page 12, submitted to Physics Letters B ; In high-energy heavy-ion collisions, the correlations between the emitted particles can be used as a probe to gain insight into the charge creation mechanisms. In this article, we report the first results of such studies using the electric charge balance function in the relative pseudorapidity \Delta\eta and azimuthal angle \Delta\phi in Pb-Pb collisions at sqrt{s_{NN}} = 2.76 TeV with the ALICE detector at the Large Hadron Collider. The width of the balance function decreases with growing centrality (i.e. for more central collisions) in both projections. This centrality dependence is not reproduced by HIJING, while AMPT, a model which incorporates strings and parton rescattering, exhibits qualitative agreement with the measured correlations in \Delta\phi but fails to describe the correlations in \Delta\eta. A thermal blast wave model incorporating local charge conservation and tuned to describe the p_T spectra and v_2 measurements reported by ALICE, is used to fit the centrality dependence of the width of the balance function and to extract the average separation of balancing charges at freeze-out. The comparison of our results with measurements at lower energies reveals an ordering with sqrt{s_{NN}}: the balance functions become narrower with increasing energy for all centralities. This is consistent with the effect of larger radial flow at the LHC energies but also with the late stage creation scenario of balancing charges. However, the relative decrease of the balance function widths in \Delta\eta and \Delta\phi with centrality from the highest SPS to the LHC energy exhibits only small differences. This observation cannot be interpreted solely within the framework where the majority of the charge is produced at a later stage in the evolution of the heavy-ion collision.

     
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    Übergeordneter Titel: ISSN: 0370-2693 ; Physics Letters B ; http://hal.in2p3.fr/in2p3-00777176 ; Physics Letters B, Elsevier, 2013, 723, pp.267-279. &#x27E8;10.1016/j.physletb.2013.05.039&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]; [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
  15. Centrality determination of Pb-Pb collisions at sqrt(sNN) = 2.76 TeV with ALICE
    Autor*in: Abelev, B.; Cheshkov, C.; Cheynis, B.; Ducroux, L.; Grossiord, J.-y.; Guilbaud, Maxime; Tieulent, R.; Uras, A.; Zoccarato, y.; Vernet, R.; Belikov, I.; Hippolyte, B.; Kuhn, C.C.; Molnar, L.; Roy, C.S.; Sanchez Castro, X.; Aphecetche, Laurent; Batigne, Guillaume; Bergognon, E.; Bregant, M.; Delagrange, H.; Driga, O.; Erazmus, B.; Estienne, Magali; Germain, Marie; Lardeux, A.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Pillot, Philippe; Schutz, y.; Shabetai, Alexandre; Stocco, Diego; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Baek, y.W.; Barret, V.; Bastid, N.; Crochet, P.; Dupieux, P.; Ichou, R.; Lopez, X.; Manso, F.; Marchisone, M.
    Erschienen: 2013
    Verlag:  HAL CCSD ; American Physical Society

    37 pages, 16 figures, authors from page 31 ; see paper for full list of authors ; This publication describes the methods used to measure the centrality of inelastic Pb-Pb collisions at a center-of-mass energy of 2.76 TeV per colliding nucleon pair... mehr

     

    37 pages, 16 figures, authors from page 31 ; see paper for full list of authors ; This publication describes the methods used to measure the centrality of inelastic Pb-Pb collisions at a center-of-mass energy of 2.76 TeV per colliding nucleon pair with ALICE. The centrality is a key parameter in the study of the properties of QCD matter at extreme temperature and energy density, because it is directly related to the initial overlap region of the colliding nuclei. Geometrical properties of the collision, such as the number of participating nucleons and number of binary nucleon-nucleon collisions, are deduced from a Glauber model with a sharp impact parameter selection, and shown to be consistent with those extracted from the data. The centrality determination provides a tool to compare ALICE measurements with those of other experiments and with theoretical calculations.

     
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    Übergeordneter Titel: ISSN: 2469-9985 ; EISSN: 2469-9993 ; Physical Review C ; http://hal.in2p3.fr/in2p3-00778545 ; Physical Review C, American Physical Society, 2013, 88, pp.044909. &#x27E8;10.1103/PhysRevC.88.044909&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  16. Measurement of Charge Multiplicity Asymmetry Correlations in High Energy Nucleus-Nucleus Collisions at 200 GeV
    Autor*in: Adamczyk, L.; Borowski, W.; Kabana, S.
    Erschienen: 2014
    Verlag:  HAL CCSD ; American Physical Society

    26 pages, 25 figures, 2 tables ; see paper for full list of authors ; A study is reported of the same- and opposite-sign charge-dependent azimuthal correlations with respect to the event plane in Au+Au collisions at 200 GeV. The charge multiplicity... mehr

     

    26 pages, 25 figures, 2 tables ; see paper for full list of authors ; A study is reported of the same- and opposite-sign charge-dependent azimuthal correlations with respect to the event plane in Au+Au collisions at 200 GeV. The charge multiplicity asymmetries between the up/down and left/right hemispheres relative to the event plane are utilized. The contributions from statistical fluctuations and detector effects were subtracted from the (co-)variance of the observed charge multiplicity asymmetries. In the mid- to most-central collisions, the same- (opposite-) sign pairs are preferentially emitted in back-to-back (aligned on the same-side) directions. The charge separation across the event plane, measured by the difference, $\Delta$, between the like- and unlike-sign up/down $-$ left/right correlations, is largest near the event plane. The difference is found to be proportional to the event-by-event final-state particle ellipticity (via the observed second-order harmonic $v_2^{\rm obs}$, where $\Delta=(1.3\pm1.4({\rm stat})^{+4.0}_{-1.0}({\rm syst}))\times10^{-5}+(3.2\pm0.2({\rm stat})^{+0.4}_{-0.3}({\rm syst}))\times10^{-3}v_2^{\rm obs}$ for 20-40% Au+Au collisions. The implications for the proposed chiral magnetic effect (\cme) are discussed.

     
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    Übergeordneter Titel: ISSN: 2469-9985 ; EISSN: 2469-9993 ; Physical Review C ; http://hal.in2p3.fr/in2p3-00797208 ; Physical Review C, American Physical Society, 2014, 89, pp.044908. &#x27E8;10.1103/PhysRevC.89.044908&#x27E9;
    Schlagworte: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]; [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
  17. J/Psi Elliptic Flow in Pb-Pb Collisions at sqrt(sNN) = 2.76 TeV
    Autor*in: Abbas, E.; Aphecetche, Laurent; Baldisseri, A.; Batigne, Guillaume; Bergognon, A.A.E.; Bregant, M.; Castillo Castellanos, J.; Charvet, J.L.; Cheshkov, C.; Cheynis, B.; Delagrange, H.; Driga, O.; Ducroux, L.; Erazmus, B.; Estienne, Magali; Germain, Marie; Geuna, C.; Guilbaud, Maxime; Hippolyte, B.; Kuhn, C.; Lardeux, A.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Molnar, L.; Pereira da Costa, H.; Pillot, Philippe; Roy, C.; Sanchez Castro, X.; Schutz, Y.; Senyukov, S.; Shabetai, Alexandre; Stocco, Diego; Tieulent, R.; Uras, A.; Vernet, R.; Yang, H.; Zoccarato, Y.; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Baek, Y.W.; Barret, V.; Bastid, N.; Crochet, P.
    Erschienen: 2013
    Verlag:  HAL CCSD ; American Physical Society

    16 pages, 4 figures, 1 Table, authors from page 11 to 13 ; see paper for full list of authors ; We report on the first measurement of inclusive J/Psi elliptic flow, v2, in heavy-ion collisions at the LHC. The measurement is performed with the ALICE... mehr

     

    16 pages, 4 figures, 1 Table, authors from page 11 to 13 ; see paper for full list of authors ; We report on the first measurement of inclusive J/Psi elliptic flow, v2, in heavy-ion collisions at the LHC. The measurement is performed with the ALICE detector in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV in the rapidity range 2.5 < y < 4.0. The dependence of the J/Psi v2 on the collision centrality and on the J/Psi transverse momentum is studied in the range 0 <= pT < 10 GeV/c. For semi-central Pb-Pb collisions at sqrt(sNN) = 2.76 TeV, an indication of non-zero v2 is observed with a maximum value of v2 = 0.116+/-0.046(stat.)+/-0.029(syst.) for J/Psi in the transverse momentum range 2 <= pT < 4 GeV/c. The elliptic flow measurement complements the previously reported ALICE results on the inclusive J/Psi nuclear modification factor and favors the scenario of a significant fraction of J/Psi production from charm quarks in a deconfined partonic phase.

     
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    Übergeordneter Titel: ISSN: 0031-9007 ; EISSN: 1079-7114 ; Physical Review Letters ; https://hal.in2p3.fr/in2p3-00804625 ; Physical Review Letters, American Physical Society, 2013, 111, pp.162301. &#x27E8;10.1103/PhysRevLett.111.162301&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  18. System Size and Energy Dependence of Dilepton Production in Heavy-Ion Collisions at SIS Energies
    Autor*in: Bratkovskaya, E. L.; Aichelin, Joerg; Thomere, M.; Vogel, S.; Bleicher, M.
    Erschienen: 2013
    Verlag:  HAL CCSD ; American Physical Society

    35 pages, 37 figures ; We study the dilepton production in heavy-ion collisions at energies of 1-2 AGeV as well as in proton induced pp, pn, pd and p+A reactions from 1 GeV up to 3.5 GeV. For the analysis we employ three different transport models -... mehr

     

    35 pages, 37 figures ; We study the dilepton production in heavy-ion collisions at energies of 1-2 AGeV as well as in proton induced pp, pn, pd and p+A reactions from 1 GeV up to 3.5 GeV. For the analysis we employ three different transport models - the microscopic off-shell Hadron-String-Dynamics (HSD) transport approach, the Isospin Quantum Molecular Dynamics (IQMD) approach as well as the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) approach. We confirm the experimentally observed enhancement of the dilepton yield (normalized to the multiplicity of neutral pions $N_{\pi^0}$) in heavy-ion collisions with respect to that measured in $NN = (pp+pn)/2$ collisions. We identify two contributions to this enhancement: a) the $pN$ bremsstrahlung which scales with the number of collisions and not with the number of participants, i.e. pions; b) the dilepton emission from intermediate $\Delta$'s which are part of the reaction cycles $\Delta \to \pi N ; \pi N \to \Delta$ and $NN\to N\Delta; N\Delta \to NN$. With increasing system size more generations of intermediate $\Delta$'s are created. If such $\Delta$ decays into a pion, the pion can be reabsorbed, however, if it decays into a dilepton, the dilepton escapes from the system. Thus, experimentally one observes only one pion (from the last produced $\Delta$) whereas the dilepton yield accumulates the contributions from all $\Delta$'s of the cycle. We show as well that the Fermi motion enhances the production of pions and dileptons in the same way. Furthermore, employing the off-shell HSD approach, we explore the influence of in-medium effects like the modification of self-energies and spectral functions of the vector mesons due to their interactions with the hadronic environment.

     
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    Übergeordneter Titel: ISSN: 2469-9985 ; EISSN: 2469-9993 ; Physical Review C ; http://hal.in2p3.fr/in2p3-00805083 ; Physical Review C, American Physical Society, 2013, 87, pp.064907. &#x27E8;10.1103/PhysRevC.87.064907&#x27E9;
    Schlagworte: [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]; [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
  19. Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV
    Autor*in: Abbas, E.; Aphecetche, Laurent; Baldisseri, A.; Batigne, Guillaume; Belikov, I.; Bergognon, A.A.E.; Borel, H.; Bregant, M.; Castillo Castellanos, J.; Charvet, J.L.; Cheshkov, C.; Cheynis, B.; Delagrange, H.; Driga, O.; Ducroux, L.; Erazmus, B.; Estienne, Magali; Germain, Marie; Geuna, C.; Guilbaud, Maxime; Hippolyte, B.; Kuhn, C.; Lardeux, A.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Pereira da Costa, H.; Pillot, Philippe; Rakotozafindrabe, A.; Roy, C.; Sanchez Castro, X.; Schutz, y.; Senyukov, S.; Shabetai, Alexandre; Stocco, Diego; Tieulent, R.; Uras, A.; Vernet, R.; yang, H.; Zoccarato, y.; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Baek, y.W.; Barret, V.
    Erschienen: 2013
    Verlag:  HAL CCSD ; Elsevier

    21 pages, 9 captioned figures, 2 tables, authors from page 16 to page 18 ; see paper for full list of authors ; We present the first wide-range measurement of the charged-particle pseudorapidity density distribution, for different centralities (the... mehr

     

    21 pages, 9 captioned figures, 2 tables, authors from page 16 to page 18 ; see paper for full list of authors ; We present the first wide-range measurement of the charged-particle pseudorapidity density distribution, for different centralities (the 0-5%, 5-10%, 10-20%, and 20-30% most central events) in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV at the LHC. The measurement is performed using the full coverage of the ALICE detectors, -5.0 < eta < 5.5, and employing a special analysis technique based on collisions arising from LHC 'satellite' bunches. We present the pseudorapidity density as a function of the number of participating nucleons as well as an extrapolation to the total number of produced charged particles Nch = 17165 +/- 772 for the 0-5% most central collisions). From the measured dNch/deta distribution we derive the rapidity density distribution, dNch/dy, under simple assumptions. The rapidity density distribution is found to be significantly wider than the predictions of the Landau model, which reproduce data well at RHIC energies. We assess the validity of longitudinal scaling by comparing to lower energy results from RHIC. Finally the mechanisms of the underlying particle production are discussed based on a comparison with various theoretical models.

     
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    Übergeordneter Titel: ISSN: 0370-2693 ; Physics Letters B ; http://hal.in2p3.fr/in2p3-00806582 ; Physics Letters B, Elsevier, 2013, 726, pp.610-622. &#x27E8;10.1016/j.physletb.2013.09.022&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  20. Freeze-out Dynamics via Charged Kaon Femtoscopy in sqrt(sNN)=200 GeV Central Au+Au Collisions
    Autor*in: Adamczyk, L.; Borowski, W.; Kabana, S.
    Erschienen: 2013
    Verlag:  HAL CCSD ; American Physical Society

    7 pages, 4 figures ; see paper for full list of authors ; We present measurements of three-dimensional correlation functions of like-sign low transverse momentum kaon pairs from sqrt(sNN)=200 GeV Au+Au collisions. A Cartesian surface-spherical... mehr

     

    7 pages, 4 figures ; see paper for full list of authors ; We present measurements of three-dimensional correlation functions of like-sign low transverse momentum kaon pairs from sqrt(sNN)=200 GeV Au+Au collisions. A Cartesian surface-spherical harmonic decomposition technique was used to extract the kaon source function. The latter was found to have a three-dimensional Gaussian shape and can be adequately reproduced by Therminator event generator simulations with resonance contributions taken into account. Compared to the pion one, the kaon source function is generally narrower and does not have the long tail along the pair transverse momentum direction. The kaon Gaussian radii display a monotonic decrease with increasing transverse mass m_T over the interval of 0.55<=m_T<=1.15 GeV/c^2. While the kaon radii are adequately described by the m_T-scaling in the outward and sideward directions, in the longitudinal direction the lowest m_T value exceeds the expectations from a pure hydrodynamical model prediction.

     
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    Übergeordneter Titel: ISSN: 2469-9985 ; EISSN: 2469-9993 ; Physical Review C ; http://hal.in2p3.fr/in2p3-00807104 ; Physical Review C, American Physical Society, 2013, 88, pp.034906. &#x27E8;10.1103/PhysRevC.88.034906&#x27E9;
    Schlagworte: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  21. System-size dependence of transverse momentum correlations at √sNN=62.4 and 200 GeV at the BNL Relativistic Heavy Ion Collider
    Autor*in: Adamczyk, L.; Borowski, W.; Kabana, S.
    Erschienen: 2013
    Verlag:  HAL CCSD ; American Physical Society

    12 pages and 9 figures ; see paper for full list of authors ; We present a study of the average transverse momentum ($p_t$) fluctuations and $p_t$ correlations for charged particles produced in Cu+Cu collisions at midrapidity for $\sqrt{s_{NN}} =$... mehr

     

    12 pages and 9 figures ; see paper for full list of authors ; We present a study of the average transverse momentum ($p_t$) fluctuations and $p_t$ correlations for charged particles produced in Cu+Cu collisions at midrapidity for $\sqrt{s_{NN}} =$ 62.4 and 200 GeV. These results are compared with those published for Au+Au collisions at same energies, to explore the system size dependence. In addition to the collision energy and system size dependence, the $p_t$ correlations results have been studied as functions of the collision centralities, the ranges in $p_t$, the pseudo-rapidity $\eta$, and the azimuthal angle $\phi$, for which the correlations are measured. The square root of the measured $p_t$ correlations when scaled by mean-$p_t$ are found to be independent of both colliding beam energy and system size studied. The transport based model calculations are found to have a better quantitative agreement with the measurements compared to models which incorporate only jet-like correlations.

     
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    Übergeordneter Titel: ISSN: 2469-9985 ; EISSN: 2469-9993 ; Physical Review C ; http://hal.in2p3.fr/in2p3-00807105 ; Physical Review C, American Physical Society, 2013, 87, pp.064902. &#x27E8;10.1103/PhysRevC.87.064902&#x27E9;
    Schlagworte: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  22. Elliptic flow of identified hadrons in Au+Au collisions at $\sqrt{s_{NN}}=$ 7.7--62.4 GeV
    Autor*in: Adamczyk, L.; Borowski, W.; Kabana, S.
    Erschienen: 2013
    Verlag:  HAL CCSD ; American Physical Society

    see paper for full list of authors ; Measurements of the elliptic flow, $v_{2}$, of identified hadrons ($\pi^{\pm}$, $K^{\pm}$, $K_{s}^{0}$, $p$, $\bar{p}$, $\phi$, $\Lambda$, $\bar{\Lambda}$, $\Xi^{-}$, $\bar{\Xi}^{+}$, $\Omega^{-}$,... mehr

     

    see paper for full list of authors ; Measurements of the elliptic flow, $v_{2}$, of identified hadrons ($\pi^{\pm}$, $K^{\pm}$, $K_{s}^{0}$, $p$, $\bar{p}$, $\phi$, $\Lambda$, $\bar{\Lambda}$, $\Xi^{-}$, $\bar{\Xi}^{+}$, $\Omega^{-}$, $\bar{\Omega}^{+}$) in Au+Au collisions at $\sqrt{s_{NN}}=$ 7.7, 11.5, 19.6, 27, 39 and 62.4 GeV are presented. The measurements were done at mid-rapidity using the Time Projection Chamber and the Time-of-Flight detectors of the STAR experiment during the Beam Energy Scan program at RHIC. A significant difference in the $v_{2}$ values for particles and the corresponding anti-particles was observed at all transverse momenta for the first time. The difference increases with decreasing center-of-mass energy, $\sqrt{s_{NN}}$ (or increasing baryon chemical potential, $\mu_{B}$) and is larger for the baryons as compared to the mesons. This implies that particles and anti-particles are no longer consistent with the universal number-of-constituent quark (NCQ) scaling of $v_{2}$ that was observed at $\sqrt{s_{NN}}=$ 200 GeV. However, for the group of particles NCQ scaling at $(m_{T}-m_{0})/n_{q}>$ 0.4 GeV/$c^{2}$ is not violated within $\pm$10%. The $v_{2}$ values for $\phi$ mesons at 7.7 and 11.5 GeV are approximately two standard deviations from the trend defined by the other hadrons at the highest measured $p_{T}$ values.

     
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    Sprache: Englisch
    Medientyp: Aufsatz aus einer Zeitschrift
    Format: Online
    Übergeordneter Titel: ISSN: 2469-9985 ; EISSN: 2469-9993 ; Physical Review C ; http://hal.in2p3.fr/in2p3-00807107 ; Physical Review C, American Physical Society, 2013, 88, pp.014902. &#x27E8;10.1103/PhysRevC.88.014902&#x27E9;
    Schlagworte: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  23. Third Harmonic Flow of Charged Particles in Au+Au Collisions at sqrtsNN = 200 GeV
    Autor*in: Adamczyk, L.; Borowski, W.; Kabana, S.
    Erschienen: 2013
    Verlag:  HAL CCSD ; American Physical Society

    12 pages, 12 figures ; see paper for full list of authors ; We report measurements of the third harmonic coefficient of the azimuthal anisotropy, v_3, known as triangular flow. The analysis is for charged particles in Au+Au collisions at $\sqrtsNN =... mehr

     

    12 pages, 12 figures ; see paper for full list of authors ; We report measurements of the third harmonic coefficient of the azimuthal anisotropy, v_3, known as triangular flow. The analysis is for charged particles in Au+Au collisions at $\sqrtsNN = 200$ GeV, based on data from the STAR experiment at the Relativistic Heavy Ion Collider. Two-particle correlations as a function of their pseudorapidity separation are fit with narrow and wide Gaussians. Measurements of triangular flow are extracted from the wide Gaussian, from two-particle cumulants with a pseudorapidity gap, and also from event plane analysis methods with a large pseudorapidity gap between the particles and the event plane. These results are reported as a function of transverse momentum and centrality. A large dependence on the pseudorapidity gap is found. Results are compared with other experiments and model calculations.

     
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    Sprache: Englisch
    Medientyp: Aufsatz aus einer Zeitschrift
    Format: Online
    Übergeordneter Titel: ISSN: 2469-9985 ; EISSN: 2469-9993 ; Physical Review C ; http://hal.in2p3.fr/in2p3-00807109 ; Physical Review C, American Physical Society, 2013, 88, pp.014904. &#x27E8;10.1103/PhysRevC.88.014904&#x27E9;
    Schlagworte: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  24. Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb-Pb collisions at sqrt{s_NN}=2.76 TeV
    Autor*in: Abelev, B.; Aphecetche, Laurent; Baldisseri, A.; Batigne, Guillaume; Belikov, I.; Bergognon, A.A.E.; Borel, H.; Bregant, M.; Castillo Castellanos, J.; Charvet, J.L.; Cheynis, B.; Delagrange, H.; Ducroux, L.; Erazmus, B.; Estienne, Magali; Germain, Marie; Grossiord, J.-Y.; Guilbaud, Maxime; Hippolyte, B.; Kuhn, C.; Lardeux, A.; Martin Blanco, J.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Molnar, L.; Pereira da Costa, H.; Pillot, Philippe; Rakotozafindrabe, A.; Sanchez Castro, X.; Schutz, Y.; Senyukov, S.; Shabetai, Alexandre; Stocco, Diego; Uras, A.; Vernet, R.; Zoccarato, Y.; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Baek, Y.W.; Barret, V.; Bastid, N.; Crochet, P.; Dupieux, P.
    Erschienen: 2013
    Verlag:  HAL CCSD ; American Physical Society

    17 pages, 4 captioned figures, author from page 12 to 17 ; see paper for full list of authors ; The directed flow of charged particles at mid-rapidity is measured in Pb-Pb collisions at sqrt{s_NN}=2.76 TeV relative to the collision plane defined by... mehr

     

    17 pages, 4 captioned figures, author from page 12 to 17 ; see paper for full list of authors ; The directed flow of charged particles at mid-rapidity is measured in Pb-Pb collisions at sqrt{s_NN}=2.76 TeV relative to the collision plane defined by the spectator nucleons. Both, the rapidity odd (v_1^odd) and even (v_1^even) directed flow components are reported. The v_1^odd component has a negative slope as a function of pseudorapidity similar to that observed at the highest RHIC energy, but with about a three times smaller magnitude. The v^even component is found to be non-zero and independent of pseudorapidity. Both components show little dependence on the collision centrality and change sign at transverse momenta around 1.2-1.7 GeV/c for midcentral collisions. The shape of v_1^even as a function of transverse momentum and a vanishing transverse momentum shift along the spectator deflection for v_1^even are consistent with dipole-like initial density fluctuations in the overlap zone of the nuclei.

     
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    Sprache: Englisch
    Medientyp: Aufsatz aus einer Zeitschrift
    Format: Online
    Übergeordneter Titel: ISSN: 0031-9007 ; EISSN: 1079-7114 ; Physical Review Letters ; https://hal.in2p3.fr/in2p3-00835541 ; Physical Review Letters, American Physical Society, 2013, 111, pp.232302. &#x27E8;10.1103/PhysRevLett.111.232302&#x27E9;
    Schlagworte: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  25. Azimuthal correlations of heavy quarks in Pb + Pb collisions at s√=2.76 TeV at the CERN Large Hadron Collider
    Autor*in: Nahrgang, Marlene; Aichelin, Joerg; Gossiaux, Pol-Bernard; Werner, Klaus
    Erschienen: 2014
    Verlag:  HAL CCSD ; American Physical Society

    In this paper we study the azimuthal correlations of heavy quarks in Pb+Pb collisions with $\sqrt{s}=2.76$ TeV at LHC. Due to the interaction with the medium heavy quarks and antiquarks are deflected from their original direction and the initial... mehr

     

    In this paper we study the azimuthal correlations of heavy quarks in Pb+Pb collisions with $\sqrt{s}=2.76$ TeV at LHC. Due to the interaction with the medium heavy quarks and antiquarks are deflected from their original direction and the initial correlation of the pair is broadened. We investigate this effect for different transverse momentum classes. Low-momentum heavy-quark pairs lose their leading order back-to-back initial correlation, while a significant residual correlation survives at large momenta. Due to the larger acquired average deflection from their original directions the azimuthal correlations of heavy-quark pairs are broadened more efficiently in a purely collisional energy loss mechanism compared to including radiative corrections. This discriminatory feature survives when next-to-leading order production processes are included.

     
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    Format: Online
    Übergeordneter Titel: ISSN: 2469-9985 ; EISSN: 2469-9993 ; Physical Review C ; http://hal.in2p3.fr/in2p3-00835775 ; Physical Review C, American Physical Society, 2014, 90, pp.024907. &#x27E8;10.1103/PhysRevC.90.024907&#x27E9;
    Schlagworte: [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]; [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]