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Nuclear Theory·nucl-th

Wednesday·March 11, 2015

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    [Submitted on 10 Mar 2015]

    Electromagnetic deuteron form factors in point form relativistic quantum mechanics

    N. A. Khokhlov

    A study of electromagnetic structure of the deuteron in the framework of relativistic quantum mechanics is presented. The deuteron form factors dependencies on the transferred 4-momentum Q are calculated. We compare results obtained with different realistic deuteron wave functions stemming from Nijmegen-I, Nijmegen-II, JISP16, CD-Bonn, Paris and Moscow (with forbidden states) potentials. A nucleon form factor parametrization consistent with modern experimental analysis was used as an input data.

    Comments:
    11 pages, 4 figures, International Conference "Nuclear Theory in the Supercomputing Era - 2014" (NTSE-2014), Khabarovsk, Russia, 2014
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1503.02770 [pdf]
    1 citation
  2. 02

    [Submitted on 10 Mar 2015]

    Hybrid neutron stars with the Dyson-Schwinger quark model and various quark-gluon vertices

    H. Chen🇨🇳 · J.-B. Wei🇨🇳 · M. Baldo🇮🇹 · G. F. Burgio🇮🇹 · H.-J. Schulze🇮🇹

    We study cold dense quark matter and hybrid neutron stars with a Dyson-Schwinger quark model and various choices of the quark-gluon vertex. We obtain the equation of state of quark matter in beta equilibrium and investigate the hadron-quark phase transition in combination with a hadronic equation of state derived within the Brueckner-Hartree-Fock many-body theory. Comparing with the results for quark matter with the rainbow approximation, the Ball-Chiu ansatz and the 1BC ansatz for the quark-gluon vertex lead to a reduction of the effective interaction at finite chemical potential, qualitatively similar to the effect of our gluon propagator. We find that the phase transition and the equation of state of the quark or mixed phase and consequently the resulting hybrid star mass and radius depend mainly on a global reduction of the effective interaction due to effects of both the quark-gluon vertex and gluon propagator, but are not sensitive to the vertex ansatz.

    Comments:
    6 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    1503.02795 [pdf]
    PRD(2015)·40 citations
  3. 03

    [Submitted on 10 Mar 2015]

    Antihyperon potentials in nuclei via exclusive antiproton-nucleus reactions at FAIR

    Alicia Sanchez Lorente🇩🇪 · Sebastian Bleser🇩🇪 · Marcell Steinen🇩🇪 · Josef Pochodzalla🇩🇪

    The exclusive production of hyperon-antihyperon pairs close to their production threshold in antiproton - nucleus collisions offers a unique and hitherto unexplored opportunity to elucidate the behaviour of antihyperons in nuclei. For the first time we analyse these reactions in a microscopic transport model using the the Gießen Boltzmann-Uehling-Uhlenbeck transport model. The calculation take the delicate interplay between the strong absorption of antihyperons, their rescattering and refraction at the nuclear surface as well as the Fermi motion of the struck nucleon into account. We find a substantial sensitivity of transverse momentum correlations of coincident -pairs to the assumed depth of the -potential. Because of the high cross section for this process and the simplicity of the experimental method our results are highly relevant for future activities at the international Facility for Antiproton and Ion Research (FAIR).

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1503.02871 [pdf]
    PLB(2015)·7 citations
  4. 04

    [Submitted on 10 Mar 2015]

    Effects of deformation on the beta-decay patterns of light even-even and odd-mass Hg and Pt isotopes

    J. M. Boillos · P. Sarriguren

    Bulk and decay properties, including deformation energy curves, charge mean square radii, Gamow-Teller (GT) strength distributions, and beta-decay half-lives, are studied in neutron-deficient even-even and odd-A Hg and Pt isotopes. The nuclear structure is described microscopically from deformed quasiparticle random-phase approximation calculations with residual interactions in both particle-hole and particle-particle channels, performed on top of a self-consistent deformed quasiparticle Skyrme Hartree-Fock basis. The observed sensitivity of the, not yet measured, GT strength distributions to deformation is proposed as an additional complementary signature of the nuclear shape. The -decay half-lives resulting from these distributions are compared to experiment to demonstrate the ability of the method.

    Comments:
    15 pages, 16 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1503.02944 [pdf]
    PRC(2015)·29 citations
  5. 05

    [Submitted on 10 Mar 2015]

    Tomography of the Quark-Gluon-Plasma by Charm Quarks

    Taesoo Song🇩🇪 · Hamza Berrehrah🇩🇪 · Daniel Cabrera🇩🇪 · Juan M. Torres-Rincon🇫🇷 · Laura Tolos🇩🇪 · Wolfgang Cassing🇩🇪 · Elena Bratkovskaya🇩🇪

    We study charm production in ultra-relativistic heavy-ion collisions by using the Parton-Hadron-String Dynamics (PHSD) transport approach. The initial charm quarks are produced by the Pythia event generator tuned to fit the transverse momentum spectrum and rapidity distribution of charm quarks from Fixed-Order Next-to-Leading Logarithm (FONLL) calculations. The produced charm quarks scatter in the quark-gluon plasma (QGP) with the off-shell partons whose masses and widths are given by the Dynamical Quasi-Particle Model (DQPM) which reproduces the lattice QCD equation-of-state in thermal equilibrium. The relevant cross section are calculated in a consistent way by employing the effective propagators and couplings from the DQPM. Close to the critical energy density of the phase transition, the charm quarks are hadronized into mesons through coalescence and/or fragmentation depending on transverse momentum. The hadronized mesons then interact with the various hadrons in the hadronic phase with cross sections calculated in an effective lagrangian approach with heavy-quark spin symmetry. Finally, the nuclear modification factor and the elliptic flow of mesons from PHSD are compared with the experimental data from the STAR Collaboration for Au+Au collisions at =200 GeV. We find that in the PHSD the energy loss of mesons at high can be dominantly attributed to partonic scattering while the actual shape of versus reflects the heavy quark hadronization scenario, i.e. coalescence versus fragmentation. Also the hadronic rescattering is important for the at low and enhances the -meson elliptic flow .

    Comments:
    15 pages, 13 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1503.03039 [pdf]
    PRC(2015)·233 citations

Affiliations

first authorsco-authorsvia INSPIRE