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Articles 1  30 of 70
FullText Articles in Physics
Phase Transitions In Mgsio3 PostPerovskite In SuperEarth Mantles, Koichiro Umemoto, Renata M. Wentzcovitch, Shunqing Wu, Min Ji, CaiZhuang Wang, KaiMing Ho
Phase Transitions In Mgsio3 PostPerovskite In SuperEarth Mantles, Koichiro Umemoto, Renata M. Wentzcovitch, Shunqing Wu, Min Ji, CaiZhuang Wang, KaiMing Ho
Ames Laboratory Accepted Manuscripts
The highest pressure form of the major Earthforming mantle silicate is MgSiO3 postperovskite (PPv). Understanding the fate of PPv at TPa pressures is the first step for understanding the mineralogy of superEarthstype exoplanets, arguably the most interesting for their similarities with Earth. Modeling their internal structure requires knowledge of stable mineral phases, their properties under compression, and major element abundances. Several studies of PPv under extreme pressures support the notion that a sequence of pressure induced dissociation transitions produce the elementary oxides SiO2 and MgO as the ultimate aggregation form at ∼3 TPa. However, none of these studies have addressed ...
Adsorption And Diffusion Of Ru Adatoms On Ru(0001)Supported Graphene: LargeScale FirstPrinciples Calculations, Yong Han, James W. Evans
Adsorption And Diffusion Of Ru Adatoms On Ru(0001)Supported Graphene: LargeScale FirstPrinciples Calculations, Yong Han, James W. Evans
Physics and Astronomy Publications
Largescale firstprinciples density functional theory calculations are performed to investigate the adsorption and diffusion of Ru adatoms on monolayer graphene (G) supported on Ru(0001). The G sheet exhibits a periodic moirécell superstructure due to lattice mismatch. Within a moirécell, there are three distinct regions: fcc, hcp, and mound, in which the C6ring center is above a fcc site, a hcp site, and a surface Ru atom of Ru(0001), respectively. The adsorption energy of a Ru adatom is evaluated at specific sites in these distinct regions. We find the strongest binding at an adsorption site above a C atom ...
Refined BcfType Boundary Conditions For Mesoscale Surface Step Dynamics, Renjie Zhao, David M. Ackerman, James W. Evans
Refined BcfType Boundary Conditions For Mesoscale Surface Step Dynamics, Renjie Zhao, David M. Ackerman, James W. Evans
Physics and Astronomy Publications
Deposition on a vicinal surface with alternating rough and smooth steps is described by a solidonsolid model with anisotropic interactions. Kinetic Monte Carlo (KMC) simulations of the model reveal step pairing in the absence of any additional step attachment barriers. We explore the description of this behavior within an analytic BurtonCabreraFrank (BCF)type step dynamics treatment. Without attachment barriers, conventional kinetic coefficients for the rough and smooth steps are identical, as are the predicted step velocities for a vicinal surface with equal terrace widths. However, we determine refined kinetic coefficients from a twodimensional discrete depositiondiffusion equation formalism which accounts for ...
Kinetic Monte Carlo Simulation Of Statistical Mechanical Models And CoarseGrained Mesoscale Descriptions Of Catalytic Reaction–Diffusion Processes: 1d Nanoporous And 2d Surface Systems, DaJiang Liu, Andrés Garcia, Jing Wang, David M. Ackerman, ChiJen Wang, James W. Evans
Kinetic Monte Carlo Simulation Of Statistical Mechanical Models And CoarseGrained Mesoscale Descriptions Of Catalytic Reaction–Diffusion Processes: 1d Nanoporous And 2d Surface Systems, DaJiang Liu, Andrés Garcia, Jing Wang, David M. Ackerman, ChiJen Wang, James W. Evans
Physics and Astronomy Publications
Traditional meanfield rate equations of chemical kinetics for spatially uniform systems1−3 and the corresponding reaction−diffusion equations describing spatial heterogeneity4−6 have proved immensely useful in elucidating catalytic processes. However, it is wellrecognized that standard meanfield rate expressions neglect spatial correlations in the reactant and/or product distribution. It is less well appreciated that the standard treatment of diffusion is generally applicable only at low concentrations and in unrestricted environments.
Discontinuous NonEquilibrium Phase Transition In A Threshold Schloegl Model For Autocatalysis: Generic TwoPhase Coexistence And Metastability, ChiJen Wang, DaJiang Liu, James W. Evans
Discontinuous NonEquilibrium Phase Transition In A Threshold Schloegl Model For Autocatalysis: Generic TwoPhase Coexistence And Metastability, ChiJen Wang, DaJiang Liu, James W. Evans
Physics and Astronomy Publications
Threshold versions of Schloegl's model on a lattice, which involve autocatalytic creation and spontaneous annihilation of particles, can provide a simple prototype for discontinuous nonequilibrium phase transitions. These models are equivalent to socalled threshold contact processes. A discontinuous transition between populated and vacuum states can occur selecting a threshold of N ≥ 2 for the minimum number, N, of neighboring particles enabling autocatalytic creation at an empty site. Fundamental open questions remain given the lack of a thermodynamic framework for analysis. For a square lattice with N = 2, we show that phase coexistence occurs not at a unique value but ...
Transitions Between Strongly Correlated And Random SteadyStates For Catalytic CoOxidation On Surfaces At HighPressure, DaJiang Liu, James W. Evans
Transitions Between Strongly Correlated And Random SteadyStates For Catalytic CoOxidation On Surfaces At HighPressure, DaJiang Liu, James W. Evans
Physics and Astronomy Publications
We explore simple latticegas reaction models for COoxidation on 1D and 2D periodic arrays of surface adsorption sites with CO adsorption and desorption, dissociative O2 adsorption and recombinative desorption (at low rate), and CO + O reaction to form CO2. Adspecies interactions are neglected, and adspecies diffusion is effectively absent. The models are motivated by studies of COoxidation on RuO2(110) at highpressures. Despite the lack of adspecies interactions, negligible adspecies diffusion results in kinetically induced spatial correlations. A transition occurs from a random primarily COpopulated steadystate at high COpartial pressure, pCO, to a strongly correlated nearOcovered steadystate for low pCO ...
Synchrotron Radiation Of Vector Bosons At Relativistic Colliders, Kirill Tuchin
Synchrotron Radiation Of Vector Bosons At Relativistic Colliders, Kirill Tuchin
Physics and Astronomy Publications
Magnetic fields produced in collisions of electrically charged particles at relativistic energies are strong enough to affect the dynamics of the strong interactions. In particular, it induces radiation of vector bosons by relativistic fermions. I calculate the corresponding spectrum in constant magnetic field and analyze its angular distribution and mass dependence. As an application, synchrotron radiation of vector bosons by relativistic plasmas is considered.
Role Of Magnetic Field In Photon Excess In Heavy Ion Collisions, Kirill Tuchin
Role Of Magnetic Field In Photon Excess In Heavy Ion Collisions, Kirill Tuchin
Physics and Astronomy Publications
The synchrotron photon spectrum in heavy ion collisions is computed taking into account the spatial and temporal structure of the magnetic field. It is found that a significant fraction of photon excess in heavy ion collisions in the region k⊥ = 1–3 GeV can be attributed to the synchrotron radiation. Azimuthal anisotropy of the synchrotron photon spectrum is characterized by the Fourier coefficients v2 = 4/7 and v4 = 1/10 that are independent of photon momentum and centrality.
Electromagnetic Field And The Chiral Magnetic Effect In The QuarkGluon Plasma, Kirill Tuchin
Electromagnetic Field And The Chiral Magnetic Effect In The QuarkGluon Plasma, Kirill Tuchin
Physics and Astronomy Publications
Time evolution of an electromagnetic field created in heavyion collisions strongly depends on the electromagnetic response of the quarkgluon plasma, which can be described by the Ohmic and chiral conductivities. The latter is intimately related to the chiral magnetic effect. I argue that a solution to the classical Maxwell equations at finite chiral conductivity is unstable due to the soft modes k < σχ that grow exponentially with time. In the kinematical region relevant for the relativistic heavyion collisions, I derive analytical expressions for the magnetic field of a point charge. I show that finite chiral conductivity causes oscillations of magnetic field at early times.
Reconstruction Of Steps On The Cu(111) Surface Induced By Sulfur, Holly L. Walen, DaJiang Liu, Junepyo Oh, Hyunseob Lim, James W. Evans, Yousoo Kim, Patricia A. Thiel
Reconstruction Of Steps On The Cu(111) Surface Induced By Sulfur, Holly L. Walen, DaJiang Liu, Junepyo Oh, Hyunseob Lim, James W. Evans, Yousoo Kim, Patricia A. Thiel
Chemistry Publications
Arich menagerie of structures is identified at 5Kfollowing adsorption of lowcoverages (≤0.05 monolayers) of S on Cu(111) at room temperature. This paper emphasizes the reconstructions at the steps. The Atype closepacked step has 1 row of S atoms along its lower edge, where S atoms occupy alternating pseudofourfoldhollow (p4fh) sites. Additionally, there are 2 rows of S atoms of equal density on the upper edge, bridging a row of extra Cu atoms, together creating an extended chain. The Btype closepacked step exhibits an even more complex reconstruction, in which triangleshaped groups of Cu atoms shift out of their ...
Cu2s3 Complex On Cu(111) As A Candidate For Mass Transport Enhancement, Holly L. Walen, DaJiang Liu, Junepyo Oh, Hyunseob Lim, James W. Evans, Christine M. Aikens, Yousoo Kim, Patricia A. Thiel
Cu2s3 Complex On Cu(111) As A Candidate For Mass Transport Enhancement, Holly L. Walen, DaJiang Liu, Junepyo Oh, Hyunseob Lim, James W. Evans, Christine M. Aikens, Yousoo Kim, Patricia A. Thiel
Chemistry Publications
Sulfurmetal complexes, containing only a few atoms, can open new, highly efficient pathways for transport of metal atoms on surfaces. For example, they can accelerate changes in the shape and size of morphological features, such as twodimensional nanoclusters, over time. In this study we perform STM under conditions that are designed to specifically isolate such complexes. We find a new, unexpected SCu complex on the Cu(111) surface, which we identify as Cu_{2}S_{3}. We propose that Cu_{2}S_{3} enhances mass transport in this system, which contradicts a previous proposal based on Cu_{3}S_{3 ...}
Nonclassical “Explosive” Nucleation In Pb/Si(111) At Low Temperatures, Matthew T. Hershberger, Myron Hupalo, Patricia A. Thiel, CaiZhuang Wang, KaiMing Ho, Michael C. Tringides
Nonclassical “Explosive” Nucleation In Pb/Si(111) At Low Temperatures, Matthew T. Hershberger, Myron Hupalo, Patricia A. Thiel, CaiZhuang Wang, KaiMing Ho, Michael C. Tringides
Chemistry Publications
Classically, the onset of nucleation is defined in terms of a critical cluster of the condensed phase, which forms from the gradual aggregation of randomly diffusing adatoms. Experiments in Pb/Si(111) at low temperature have discovered a dramatically different type of nucleation, with perfect crystalline islands emerging “explosively” out of the compressed wetting layer after a critical coverage Θc ¼ 1.22 ML is reached. The unexpectedly high island growth rates, the directional correlations in the growth of neighboring islands and the persistence in time of where mass is added in individual islands, suggest that nucleation is a result ...
RealTime Ab Initio Kmc Simulation Of The SelfAssembly And Sintering Of Bimetallic Epitaxial Nanoclusters: Au + Ag On Ag(100), Yong Han, DaJiang Liu, James W. Evans
RealTime Ab Initio Kmc Simulation Of The SelfAssembly And Sintering Of Bimetallic Epitaxial Nanoclusters: Au + Ag On Ag(100), Yong Han, DaJiang Liu, James W. Evans
Physics and Astronomy Publications
Farfromequilibrium shape and structure evolution during formation and postassembly sintering of bimetallic nanoclusters is extremely sensitive to the periphery diffusion and intermixing kinetics. Precise characterization of the many distinct localenvironmentdependent diffusion barriers is achieved for epitaxial nanoclusters using density functional theory to assess interaction energies both with atoms at adsorption sites and at transition states. Kinetic Monte Carlo simulation incorporating these barriers then captures structure evolution on the appropriate time scale for twodimensional corering and intermixed Au–Ag nanoclusters on Ag(100).
Dissociative Adsorption Of O2 On Unreconstructed Metal (100) Surfaces: Pathways, Energetics, And Sticking Kinetics, DaJiang Liu, James W. Evans
Dissociative Adsorption Of O2 On Unreconstructed Metal (100) Surfaces: Pathways, Energetics, And Sticking Kinetics, DaJiang Liu, James W. Evans
Physics and Astronomy Publications
An accurate description of oxygen dissociation pathways and kinetics for various local adlayer environments is key for an understanding not just of the coverage dependence of oxygen sticking, but also of reactive steady states in oxidation reactions. Density functional theory analysis for M(100) surfaces with M=Pd, Rh, and Ni, where O prefers the fourfold hollow adsorption site, does not support the traditional BrundleBehmBarker picture of dissociative adsorption onto secondnearestneighbor hollow sites with an additional blocking constraint. Rather adsorption via neighboring vicinal bridge sites dominates, although other pathways can be active. The same conclusion also applies for M=Pt ...
Statistical Mechanical Models For Dissociative Adsorption Of O2 On Metal(100) Surfaces With Blocking, Steering, And Funneling, DaJiang Liu, James W. Evans
Statistical Mechanical Models For Dissociative Adsorption Of O2 On Metal(100) Surfaces With Blocking, Steering, And Funneling, DaJiang Liu, James W. Evans
Physics and Astronomy Publications
We develop statistical mechanical models amenable to analytic treatment for the dissociative adsorption of O2 at hollow sites on fcc(100) metal surfaces. The models incorporate exclusion of nearestneighbor pairs of adsorbed O. However, corresponding simple siteblocking models, where adsorption requires a large ensemble of available sites, exhibit an anomalously fast initial decrease in sticking. Thus, in addition to blocking, our models also incorporate more facile adsorption via orientational steering and funneling dynamics (features supported by ab initio Molecular Dynamics studies). Behavior for equilibrated adlayers is distinct from those with finite adspecies mobility. We focus on the lowtemperature limitedmobility regime ...
Violation Of Geometric Scaling In Deep Inelastic Scattering Due To Coulomb Corrections, Kirill Tuchin
Violation Of Geometric Scaling In Deep Inelastic Scattering Due To Coulomb Corrections, Kirill Tuchin
Physics and Astronomy Publications
We compute the Coulomb correction to the total and diffractive cross sections for virtual photon scattering off a heavy nucleus at low x. We show that it violates the geometric scaling in a wide range of photon virtualities and is weakly x independent. In heavy nuclei at low Q2, the Coulomb correction to the total and diffractive cross sections is about 20% and 40%, correspondingly.
Coulomb Corrections To Photon And Dilepton Production In HighEnergy P A Collisions, Kirill Tuchin
Coulomb Corrections To Photon And Dilepton Production In HighEnergy P A Collisions, Kirill Tuchin
Physics and Astronomy Publications
I consider particle production in highenergy pA collisions. In addition to the coherent interactions with the nuclear color field, I take into account coherent interactions with the nuclear electromagnetic Coulomb field. Employing the dipole model, I sum up the leading multiple color and electromagnetic interactions and derive inclusive cross sections for photon and dilepton production. I found that the Coulomb corrections are up to 10% at √ s = 200 GeV per nucleon.
Nuclear Modification Of The J/Psi Transverse Momentum, Dmitri Kharzeev, Eugene M. Levin, Kirill Tuchin
Nuclear Modification Of The J/Psi Transverse Momentum, Dmitri Kharzeev, Eugene M. Levin, Kirill Tuchin
Physics and Astronomy Publications
We evaluate the transverse momentum spectrum of J/Ïˆ (up to semihard momenta) in pA and AA collisions taking into account only the initial state effects, but resumming them to all orders in Î±s2A1/3. In our previous papers we noticed that cold nuclear matter effects alone could not explain the experimental data on rapidity and centrality dependencies of the J/Ïˆ yield in AA collisions indicating the existence of an additional suppression mechanism. Our present calculations indicate that the discrepancy persists and even increases at semihard transverse momenta, implying a significant final state effect on J/Ïˆ production ...
Search For The Structure Of A SulfurInduced Reconstruction On Cu(111), DaJiang Liu, Holly L. Walen, Junepyo Oh, James W. Evans, Yousoo Kim, Patricia A. Thiel
Search For The Structure Of A SulfurInduced Reconstruction On Cu(111), DaJiang Liu, Holly L. Walen, Junepyo Oh, James W. Evans, Yousoo Kim, Patricia A. Thiel
Chemistry Publications
We have carried out an extensive DFTbased search for the structure of the (√43 × √43)R ± 7.5° reconstruction of S on Cu(111), which exhibits a honeycombtype structure in scanning tunneling microscopy (STM). We apply two criteria in this search: The structure must have a reasonably low chemical potential, and it must provide a good match with STM data, both our own and the data published by Wahlström et al. Phys. Rev. B 1999, 60, 10699. The best model has 12 S adatoms and 9 Cu adatoms per unit cell. Local defects within the Cu9S12 framework, consisting of ...
Taking Advantage Of Gold’S Electronegativity In R4mn3–Xau10+X (R = Gd Or Y; 0.2 ≤ X ≤ 1), Saroj L. Samal, Abhishek Pandey, D. C. Johnston, John D. Corbett, Gordon J. Miller
Taking Advantage Of Gold’S Electronegativity In R4mn3–Xau10+X (R = Gd Or Y; 0.2 ≤ X ≤ 1), Saroj L. Samal, Abhishek Pandey, D. C. Johnston, John D. Corbett, Gordon J. Miller
Chemistry Publications
Ternary R_{4}Mn_{3–x}Au_{10+x} (R = Gd or Y; 0.2 ≤ x ≤ 1) compounds have been synthesized and characterized using singlecrystal Xray diffraction. The structure is a ternary variant of orthorhombic Zr_{7}Ni_{10} (oC68, space group Cmca) and is isostructural with Ca_{4}In_{3}Au_{10}. The structure contains layers of Mncentered rectangular prisms of gold (Mn@Au_{8}), interbonded via Au atoms in the bc plane, and stacked in a hexagonal close packed arrangement along the a direction. These layers are bonded via additional Mn atoms along the a direction. The ...
Beyond The Proton Collinear Factorization In Heavy Quark Production In Pa Collisions At Low X, Kirill Tuchin
Beyond The Proton Collinear Factorization In Heavy Quark Production In Pa Collisions At Low X, Kirill Tuchin
Physics and Astronomy Publications
We consider heavy quark production in high energy pA collisions and investigate the contribution of interactions of valence quarks of proton with the nucleus. The often made assumption that valence quarks of proton can be factored out is justified only if the nucleus saturation momentum is much smaller than the heavy quark mass. This is not the case in phenomenologically relevant situations. Breakdown of factorization manifests itself in substantial decrease of the cross section at large total and small relative transverse momenta of the heavy quarkantiquark pair.
Particle Production In Strong Electromagnetic Fields In Relativistic HeavyIon Collisions, Kirill Tuchin
Particle Production In Strong Electromagnetic Fields In Relativistic HeavyIon Collisions, Kirill Tuchin
Physics and Astronomy Publications
I review the origin and properties of electromagnetic fields produced in heavyion collisions. The field strength immediately after a collision is proportional to the collision energy and reaches mÏ€2 at RHIC and 10mÏ€2 at LHC. I demonstrate by explicit analytical calculation that after dropping by about onetwo orders of magnitude during the first fm/c of plasma expansion, it freezes out and lasts for as long as quarkgluon plasma lives as a consequence of finite electrical conductivity of the plasma. Magnetic field breaks spherical symmetry in the direction perpendicular to the reaction plane, and therefore all kinetic coefficients ...
Magnetic Contribution To Dilepton Production In HeavyIon Collisions, Kirill Tuchin
Magnetic Contribution To Dilepton Production In HeavyIon Collisions, Kirill Tuchin
Physics and Astronomy Publications
We calculate a novel "magnetic contribution" to the dilepton spectrum in heavyion collisions arising from interaction of relativistic quarks with intense magnetic field. Synchrotron radiation by quarks, which can be approximated by the equivalent photon flux, is followed by dilepton decay of photons in an intense magnetic field. We argue that the "magnetic contribution" dominates the dilepton spectrum at low lepton energies, whereas a conventional photon dilepton decay dominates at higher lepton energies.
Electromagnetic Radiation By QuarkGluon Plasma In A Magnetic Field, Kirill Tuchin
Electromagnetic Radiation By QuarkGluon Plasma In A Magnetic Field, Kirill Tuchin
Physics and Astronomy Publications
The electromagnetic radiation by quarkgluon plasma in a strong magnetic field is calculated. The contributing processes are synchrotron radiation and onephoton annihilation. It is shown that in relativistic heavyion collisions at the BNL Relativistic Heavy Ion Collider (RHIC) and CERN Large Hadron Collider (LHC) synchrotron radiation dominates over the annihilation. Moreover, it constitutes a significant part of all photons produced by the plasma at low transverse momenta; its magnitude depends on the plasma temperature and the magnetic field strength. Electromagnetic radiation in a magnetic field is probably the missing piece that resolves a discrepancy between the theoretical models and the ...
Time And Space Dependence Of The Electromagnetic Field In Relativistic HeavyIon Collisions, Kirill Tuchin
Time And Space Dependence Of The Electromagnetic Field In Relativistic HeavyIon Collisions, Kirill Tuchin
Physics and Astronomy Publications
Exact analytical solution for the spacetime evolution of electromagnetic field in electrically conducting nuclear matter produced in heavyion collisions is discussed. It is argued that the parameter that controls the strength of the matter effect on the field evolution is ÏƒÎ³b, where Ïƒ is electrical conductivity, Î³ is the Lorentz boostfactor, and b is the characteristic transverse size of the matter. When this parameter is of the order 1 or larger, which is the case at the Relativistic Heavy Ion Collider and the Large Hadron Collider, the spacetime dependence of the electromagnetic field completely differs from that in vacuum.
The Vhe GammaRay Spectra Of Several HardSpectrum Blazars From LongTerm Observations With The Veritas Telescope Array, Arun Sreenivasan Madhavan
The Vhe GammaRay Spectra Of Several HardSpectrum Blazars From LongTerm Observations With The Veritas Telescope Array, Arun Sreenivasan Madhavan
Graduate Theses and Dissertations
Analysis is presented on VERITAS observations of the very high energy gammaray spectra of five high frequency peaked BL Lac objects over a range of redshifts. Each object has an unusually hard intrinsic GeV spectrum, and is expected to produce TeV gammaray emission into the optically thick regime of the universe's diffuse extragalactic background light (EBL). Hard spectrum HBLs have recently emerged as an effective tool for measurement of the EBL spectrum, due to extinction of gammaray signals from blazars via the pair production interaction gammaTeV gammaEBL → e+e−. The VERITAS collaboration has approved long term observations on several ...
Analytic Formulations For OneDimensional Decay Of Rectangular Homoepitaxial Islands During Coarsening On Anisotropic Fcc (110) Surfaces, ChiJen Wang, Yong Han, Holly L. Walen, Selena M. Russell, Patricia A. Thiel, James W. Evans
Analytic Formulations For OneDimensional Decay Of Rectangular Homoepitaxial Islands During Coarsening On Anisotropic Fcc (110) Surfaces, ChiJen Wang, Yong Han, Holly L. Walen, Selena M. Russell, Patricia A. Thiel, James W. Evans
Chemistry Publications
Submonolayer homoepitaxial fcc (110) systems display behavior reflecting strong anisotropy at lower temperatures, including onedimensional decay during Ostwald ripening of rectangular islands maintaining constant width in the ã€ˆ001ã€‰ direction. To appropriately describe this behavior, we first develop a refined continuum BurtonCabreraFrank formalism, which accounts for a lack of equilibration of island shape and importantly also for inhibited incorporation of adatoms at almostfaceted ã€ˆ1Ì„10ã€‰ island edges through effective kinetic coefficients. This formalism is shown to describe accurately the adatom diffusion fluxes between islands and thus island evolution for a complex experimental island configuration, as confirmed by matching results ...
Tricriticality In Generalized Schloegl Models For Autocatalysis: LatticeGas Realization With Particle Diffusion, Xiaofang Guo, Daniel K. Unruh, DaJiang Liu, James W. Evans
Tricriticality In Generalized Schloegl Models For Autocatalysis: LatticeGas Realization With Particle Diffusion, Xiaofang Guo, Daniel K. Unruh, DaJiang Liu, James W. Evans
Physics and Astronomy Publications
We analyze lattice–gas reaction–diffusion models which include spontaneous annihilation, autocatalytic creation, and diffusion of particles, and which incorporate the particle creation mechanisms of both Schloegl’s first and second models. For fixed particle diffusion or hop rate, adjusting the relative strength of these creation mechanisms induces a crossover between continuous and discontinuous transitions to a “poisoned” vacuum state. Kinetic Monte Carlo simulations are performed to map out the corresponding tricritical line as a function of hop rate. An analysis is also provided of the tricritical “epidemic exponent” for the case of no hopping. The phase diagram is also ...
Gluon Saturation Effects On The Color Singlet J/Psi Production In High Energy Da And Aa Collisions, F. Dominguez, D. E. Kharzeev, E. M. Levin, A. H. Mueller, Kirill Tuchin
Gluon Saturation Effects On The Color Singlet J/Psi Production In High Energy Da And Aa Collisions, F. Dominguez, D. E. Kharzeev, E. M. Levin, A. H. Mueller, Kirill Tuchin
Physics and Astronomy Publications
We derive the formulae for the cross section of J/Psi production in high energy pA and AA collisions taking into account the gluon saturation/color glass condensate effects. We then perform the numerical calculations of the corresponding nuclear modification factors and find a good agreement between our calculations and the experimental data on . J/Psi production in pA collisions. We also observe that cold nuclear modification effects alone cannot describe the data on . J/Psi production in AA collisions. Additional final state suppression (at RHIC) and enhancement (at LHC) mechanisms are required to explain the experimental observations.
Properties Of Inclusive Hadron Production In Deep Inelastic Scattering On Heavy Nuclei At Low X, Kirill Tuchin, Dajiing Wu
Properties Of Inclusive Hadron Production In Deep Inelastic Scattering On Heavy Nuclei At Low X, Kirill Tuchin, Dajiing Wu
Physics and Astronomy Publications
We present a comprehensive study of inclusive hadron production in deep inelastic scattering (DIS) at low x. Properties of the hadron spectrum are different in different kinematic regions formed by three relevant momentum scales: photon virtuality Q2, hadron transverse momentum k T and the saturation momentum Q s(x). We investigate each kinematic region and derive the corresponding asymptotic formulas for the cross section at the leading logarithmic order. We also analyze the nexttoleadingorder corrections to the BalitskiiFadinKuraevLipatov kernel that are responsible for the momentum conservation. In particular, we establish the asymptotic behavior of the forward elastic dipolenucleus scattering amplitude ...