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Nuclear Theory·nucl-th

Tuesday·March 29, 2016

11 papers—6 primary·5 cross-listed

All11Primary6Cross-lists5
  1. 01

    Test of the Glauber Formula for Nucleon-Deuteron Scattering at Intermediate Energies

    V. I. Kovalchuk

    A high-precision test of the Glauber formula for the amplitude of nucleon-deuteron scattering is performed. Nucleon-nucleon amplitudes used in the calculations depend on the spins of interacting particles, phase shifts, and mixing parameters. These amplitudes were derived by using the Nijmegen potentials. The differential cross sections for nucleon-deuteron scattering were calculated for the projectile-nucleon energies of 65, 95, 135, 150, 190, and 250~MeV, and the results of these calculations were compared with experimental data.

    nucl-thPhys.Atom.Nucl.(2012)·3 citations
  2. 02

    Understanding transport simulations of heavy-ion collisions at 100 and 400 AMeV: Comparison of heavy ion transport codes under controlled conditions

    Jun Xu🇨🇳 · Lie-Wen Chen🇨🇳 · ManYee Betty Tsang🇺🇸 · Hermann Wolter🇩🇪 · Ying-Xun Zhang🇨🇳 · Joerg Aichelin🇫🇷 · Maria Colonna🇮🇹 · Dan Cozma🇷🇴 · Pawel Danielewicz🇺🇸 · Zhao-Qing Feng🇨🇳 · Arnaud Le Fevre🇩🇪 · Theodoros Gaitanos🇬🇷 and 19 other authors

    Transport simulations are very valuable for extracting physics information from heavy-ion collision experiments. With the emergence of many different transport codes in recent years, it becomes important to estimate their robustness in extracting physics information from experiments. We report on the results of a transport code comparison project. 18 commonly used transport codes were included in this comparison: 9 Boltzmann-Uehling-Uhlenbeck-type codes and 9 Quantum-Molecular-Dynamics-type codes. These codes have been required to simulate Au+Au collisions using the same physics input for mean fields and for in-medium nucleon-nucleon cross sections, as well as the same initialization set-up, the impact parameter, and other calculational parameters at 100 and 400 AMeV incident energy. Among the codes we compare one-body observables such as rapidity and transverse flow distributions. We also monitor non-observables such as the initialization of the internal states of colliding nuclei and their stability, the collision rates and the Pauli blocking. We find that not completely identical initializations constitute partly for different evolutions. Different strategies to determine the collision probabilities, and to enforce the Pauli blocking, also produce considerably different results. There is a substantial spread in the predictions for the observables, which is much smaller at the higher incident energy. We quantify the uncertainties in the collective flow resulting from the simulation alone as about at 100 AMeV and at 400 AMeV, respectively. We propose further steps within the code comparison project to test the different aspects of transport simulations in a box calculation of infinite nuclear matter. This should, in particular, improve the robustness of transport model predictions at lower incident energies where abundant amounts of data are available.

    nucl-thnucl-exPRC(2016)·186 citations
  3. 03

    Exploring Dense and Cold QCD in Magnetic Fields

    E. J. Ferrer🇺🇸 · V. de la Incera🇺🇸

    Strong magnetic fields are commonly generated in off-central relativistic heavy-ion collisions in the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Lab and in the Large Hadron Collider at CERN and have been used to probe the topological configurations of the QCD vacua. A strong magnetic field can affect the character and location of the QCD critical point, influence the QCD phases, and lead to anomalous transport of charge. To take advantage of the magnetic field as a probe of QCD at higher baryon densities, we are going to need experiments capable to scan the lower energy region. In this context, the nuclotron-based ion collider facility (NICA) at JINR offers a unique opportunity to explore such a region and complement alternative programs at RHIC and other facilities. In this paper we discuss some relevant problems of the interplay between QCD and magnetic fields and the important role the experiments at NICA can play in tackling them.

    nucl-thhep-phnucl-exEPJA(2016)·17 citations
  4. 04

    The Dubna-Mainz-Taipei Dynamical Model for Scattering and Electromagnetic Production

    Shin Nan Yang🇹🇼

    Some of the featured results of the Dubna-Mainz-Taipei (DMT) dynamical model for scattering and electromagnetic production are summarized. These include results for threshold production, deformation of , and the extracted properties of higher resonances below 2 GeV. The excellent agreement of DMT model's predictions with threshold production data, including the recent precision measurements from MAMI establishes results of DMT model as a benchmark for experimentalists and theorists in dealing with threshold pion production.

    nucl-thhep-phJPS Conf.Proc.(2016)·1 citation
  5. 05

    Quark-Jet model for transverse momentum dependent fragmentation functions

    W. Bentz🇯🇵 · A. Kotzinian🇦🇲 · H. H. Matevosyan🇦🇺 · Y. Ninomiya🇯🇵 · A. W. Thomas🇦🇺 · K. Yazaki🇯🇵

    In order to describe the hadronization of polarized quarks, we discuss an extension of the quark-jet model to transverse momentum dependent fragmentation functions. The description is based on a product ansatz, where each factor in the product represents one of the transverse momentum dependent splitting functions, which can be calculated by using effective quark theories. The resulting integral equations and sum rules are discussed in detail for the case of inclusive pion production. In particular, we demonstrate that the 3-dimensional momentum sum rules are satisfied naturally in this transverse momentum dependent quark-jet model. Our results are well suited for numerical calculations in effective quark theories, and can be implemented in Monte-Carlo simulations of polarized quark hadronization processes.

    nucl-thhep-exhep-phPRD(2016)·16 citations
  6. 06

    Inclusive electron scattering within the SuSAv2-MEC approach

    G.D. Megias🇪🇸 · J.E. Amaro🇪🇸 · M.B. Barbaro🇮🇹 · J.A. Caballero🇪🇸 · T.W. Donnelly🇺🇸

    We present our recent progress on the relativistic modeling of electron-nucleus reactions and compare our predictions with inclusive C () experimental data in a wide kinematical region. The model, originally based on the superscaling phenomenon shown by electron-nucleus scattering data, has recently been improved through the inclusion of Relativistic Mean Field theory effects that take into account the enhancement of the transverse scaling function compared with its longitudinal counterpart. We also discuss the impact of meson-exchange currents (MEC) through the analysis of two-particle two-hole longitudinal and transverse contributions to electromagnetic response functions evaluated within the framework of the relativistic Fermi gas. The formalism is also extended to include the complete inelastic spectrum -- resonant, non-resonant and deep inelastic scattering (DIS). The results show quite good agreement with data over the whole range of energy transfer, including the dip region between the quasielastic peak and the resonance.

    nucl-thhep-exhep-phPRD(2016)·112 citations

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first authorsco-authorsvia INSPIRE