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    Advances in Clayff Molecular Simulation of Layered and Nanoporous Materials and Their Aqueous Interfaces

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    American Chemical Society
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    International audienceAs a general-purpose force field for molecular simulations of layered materials and their fluid interfaces, Clayff continues to see broad usage in atomistic computational modeling for numerous geoscience and materials science applications due to its (1) success in predicting properties of bulk nanoporous materials and their interfaces, (2) transferability to a range of layered and nanoporous materials, and (3) simple functional form which facilitates incorporation into a variety of simulation codes. Here, we review applications of Clayff to model bulk phases and interfaces not included in the original parameter set and recent modifications for modeling surface terminations such as hydroxylated nanoparticle edges. We conclude with a discussion of expectations for future developments

    Jets-medium coupled evolution in AA collisions: the parton shower

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    HAL CCSD
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    Study of 2nd order susceptibilities with EPOS event generator

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    HAL CCSD
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    International audienc

    Λc+\Lambda^+_c Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at sNN\sqrt {s_{NN}}=5.02  TeV at the LHC

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    American Physical Society
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    International audienceThe prompt production of the charm baryon Λc+ and the Λc+/D0 production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at sNN=5.02  TeV. These new measurements show a clear decrease of the Λc+/D0 ratio with increasing transverse momentum (pT) in both collision systems in the range 2<pT<12  GeV/c, exhibiting similarities with the light-flavor baryon-to-meson ratios p/π and Λ/KS0. At low pT, predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in e+e- and e-p collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies

    The design and sensitivity of JUNO’s scintillator radiopurity pre-detector OSIRIS

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    HAL CCSD
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    International audienceThe OSIRIS detector is a subsystem of the liquid scintillator filling chain of the JUNO reactor neutrino experiment. Its purpose is to validate the radiopurity of the scintillator to assure that all components of the JUNO scintillator system work to specifications and only neutrino-grade scintillator is filled into the JUNO Central Detector. The aspired sensitivity level of 10−16 g/g10^{-16}\hbox { g/g} of 238U^{238}\hbox {U} and 232Th^{232}\hbox {Th} requires a large (∼20 m3\sim 20\,\hbox {m}^3) detection volume and ultralow background levels. The present paper reports on the design and major components of the OSIRIS detector, the detector simulation as well as the measuring strategies foreseen and the sensitivity levels to U/Th that can be reached in this setup

    Assessment of plutonium inventory management in the french nuclear fleet with the fuel cycle simulator CLASS

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    HAL CCSD
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    International audienceThe ASTRID French project aimed at designing, building and operating a sodium fast reactor cooled with liquid sodium. One of the goals of the project was to demonstrate the feasibility of the plutonium multi-recycling in a fast spectrum. Commissariat à l’énergie atomique et aux énergies alternatives (CEA - Atomic & Alternative Energies Commission) has recently announced the abandon of the project which involves that no sodium fast reactor project is planned in France. As a consequence, there is a real interest in assessing technical feasibility for alternative plutonium management. In this work, the plutonium multi-recycling in PWR is assessed from fuel cycle simulations performed with the library CLASS developed by CNRS/IN2P3. The technical conditions for plutonium incineration and stabilization are investigated. It is shown that plutonium can be stabilized with 30% of PWR using multi-reprocessed plutonium in MOX fuel, the rest being composed by PWR loaded with UOX. The transuranic (plutonium and minor actinides) stabilization involves a plutonium incineration. For this reason, around 50% of PWR using multi-reprocessed plutonium is required and the nuclear power has to decrease. In this paper, the methodology and the output analysis are described in detail

    Kaon–proton strong interaction at low relative momentum via femtoscopy in Pb–Pb collisions at the LHC

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    HAL CCSD
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    International audienceIn quantum scattering processes between two particles, aspects characterizing the strong and Coulomb forces can be observed in kinematic distributions of the particle pairs. The sensitivity to the interaction potential reaches a maximum at low relative momentum and vanishing distance between the two particles. Ultrarelativistic heavy-ion collisions at the LHC provide an abundant source of many hadron species and can be employed as a measurement method of scattering parameters that is complementary to scattering experiments. This study confirms that momentum correlations of particles produced in Pb-Pb collisions at the LHC provide an accurate measurement of kaon-proton scattering parameters at low relative momentum, allowing precise access to the K−p→K−p {K}^{-} p\rightarrow {K}^{-} p process. This work also validates the femtoscopic measurement in ultrarelativistic heavy-ion collisions as an alternative to scattering experiments and a complementary tool to the study of exotic atoms with comparable precision. In this work, the first femtoscopic measurement of momentum correlations of K−p (K+p‾){K}^{-} p\ ({K}^{+}\overline{p}) and K+p(K−p‾){K}^{+}p ({K}^{-}\overline{p}) pairs in Pb-Pb collisions at centre-of-mass energy per nucleon pair of sNN=5.02\sqrt{s_{\rm NN}} = 5.02 TeV registered by the ALICE experiment is reported. The components of the K−p{K}^{-} p complex scattering length are extracted and found to be ℜf0=−0.91± 0.03\Re f_0=-0.91\pm~{0.03}(stat)−0.03+0.17^{+0.17}_{-0.03}(syst) and ℑf0=0.92± 0.05\Im f_0 = 0.92\pm~{0.05}(stat)−0.33+0.12^{+0.12}_{-0.33}(syst). The results are compared with chiral effective field theory predictions as well as with existing data from dedicated scattering and exotic kaonic atom experiments

    Charged-particle multiplicity fluctuations in Pb–Pb collisions at sNN\sqrt{s_{\mathrm {NN}}}  = 2.76 TeV

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    HAL CCSD
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    International audienceMeasurements of event-by-event fluctuations of charged-particle multiplicities in Pb–Pb collisions at sNN\sqrt{s_{\mathrm {NN}}}  == 2.76 TeV using the ALICE detector at the CERN Large Hadron Collider (LHC) are presented in the pseudorapidity range ∣η∣<0.8|\eta |<0.8 and transverse momentum 0.2<pT<2.00.2< p_{\mathrm{T}} < 2.0 GeV/c. The amplitude of the fluctuations is expressed in terms of the variance normalized by the mean of the multiplicity distribution. The η\eta and pTp_{\mathrm{T}} dependences of the fluctuations and their evolution with respect to collision centrality are investigated. The multiplicity fluctuations tend to decrease from peripheral to central collisions. The results are compared to those obtained from HIJING and AMPT Monte Carlo event generators as well as to experimental data at lower collision energies. Additionally, the measured multiplicity fluctuations are discussed in the context of the isothermal compressibility of the high-density strongly-interacting system formed in central Pb–Pb collisions

    CORI research on cement-organics-radionuclides-interactions within the collaborative EURAD project

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    HAL CCSD
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    Dynamical cluster and hypernuclei production in heavy-ion collisions

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    HAL CCSD
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    International audienceWe study light cluster and hypernuclei production in heavy-ion collisions from SIS to RHIC energies based on the n-body dynamical transport approach PHQMD (Parton-Hadron-Quantum-Molecular-Dynamics). In PHQMD clusters are formed dynamically due to the interactions between baryons described on the basis of Quantum Molecular Dynamics (QMD) which allows to propagate the n-body Wigner density and n-body correlations in phase-space, which is essential for the cluster formation. The clusters are identified by the MST (Minimum Spanning Tree) or the SACA (‘Simulated Annealing Cluster Algorithm’) algorithm which finds the most-bound configuration of nucleons and clusters. Collisions among hadrons as well as Quark-Gluon-Plasma formation and parton dynamics in PHQMD are treated in the same way as in the PHSD (Parton-Hadron-String-Dynamics) transport approach. We study the time evolution of the cluster formation in the expanding medium and the stability of the clusters. We present a comparison of the PHQMD results for d, 3He as well as for the hypernuclei with experimental data

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