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Nuclear Theory·nucl-th

Friday·November 6, 2015

6 papers—6 primary·0 cross-listed

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  1. 01

    [Submitted on 4 Nov 2015]

    Heavy mesons in a hadronic medium: interaction and transport coefficients

    Juan M. Torres-Rincon🇫🇷 · Luciano M. Abreu🇧🇷 · Daniel Cabrera🇩🇪 · Olena Romanets🇳🇱 · Laura Tolos🇩🇪

    We review the recent results of heavy meson diffusion in thermal hadronic matter. The interactions of D and B-bar mesons with other hadrons (light mesons and baryons) are extracted from effective field theories based on chiral and heavy-quark symmetries. When these guiding principles are combined with exact unitarity, physical values of the cross sections are obtained. These cross sections (which contain resonant contributions) are used to calculate the drag and diffusion coefficients of heavy mesons immersed in a thermal and dense medium. The transport coefficients are computed using a Fokker-Planck reduction of the Boltzmann equation.

    Comments:
    4 pages, 3 figures. Contribution to the proceedings of the 15th International Conference on Strangeness in Quark Matter (SQM 2015), 06-11 Jul 2015. Dubna, Moscow region, Russia
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1511.01524 [pdf]
    J.Phys.Conf.Ser.(2016)·2 citations
  2. 02

    [Submitted on 4 Nov 2015]

    A New Method for Obtaining the Baryons Mass under the Killingbeck Plus Isotonic Oscillator Potentials

    Nasrin Salehi🇮🇷

    In this work, the spectrum of ground state and excited baryons (N, {\Delta}, , , and {\Omega} particles) has been investigated by using a non-relativistic quantum mechanics under the Killingbeck plus isotonic oscillator potentials. Using the Jacobi-coordinates, anzast method and generalized Gürsey Radicati (GR) mass formula the three body wave equation is solved to calculate the different states of the considered baryons. A comparison between our calculations and the available experimental data shows that the position of the Roper resonances of the nucleon, the ground states and the excited multiplets up to three GeV are in general well reproduced. Also one can conclude that; the interaction between the quark constituents of baryon resonances could be described adequately by using the combination of Killingbeck and isotonic oscillator potentials form.

    Comments:
    arXiv admin note: text overlap with arXiv:nucl-th/0506032 by other authors
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1511.01531 [pdf]
    Adv.High Energy Phys.(2016)·7 citations
  3. 03

    [Submitted on 5 Nov 2015]

    Properties of nuclear matter from macroscopic-microscopic mass formulas

    Ning Wang🇨🇳 · Min Liu🇨🇳 · Li Ou🇨🇳 · Yingxun Zhang🇨🇳

    Based on the standard Skyrme energy density functionals together with the extended Thomas-Fermi approach, the properties of symmetric and asymmetric nuclear matter represented in two macroscopic-microscopic mass formulas: Lublin-Strasbourg nuclear drop energy (LSD) formula and Weizsäcker-Skyrme (WS*) formula, are extracted through matching the energy per particle of finite nuclei. For LSD and WS*, the obtained incompressibility coefficients of symmetric nuclear matter are MeV and MeV, respectively. The slope parameter of symmetry energy at saturation density is MeV for LSD and MeV for WS*, respectively, which is compatible with the liquid-drop analysis of Lattimer and Lim [ApJ. \textbf{771}, 51 (2013)]. The density dependence of the mean-field isoscalar and isovector effective mass, and the neutron-proton effective masses splitting for neutron matter are simultaneously investigated. The results are generally consistent with those from the Skyrme Hartree-Fock-Bogoliubov calculations and nucleon optical potentials, and the standard deviations are large and increase rapidly with density. A better constraint for the effective mass is helpful to reduce uncertainties of the depth of the mean-field potential.

    Comments:
    5 figures, to appear in Phys. Lett. B
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1511.01557 [pdf]
    PLB(2015)·29 citations
  4. 04

    [Submitted on 5 Nov 2015]

    Dirac Coupled Channel Analyses of the high-lying excited states at Ne(p,p)Ne

    Sugie Shim · Moon-Won Kim

    Dirac phenomenological coupled channel analyses are performed using an optical potential model for the high-lying excited vibrational states at 800 MeV unpolarized proton inelastic scatterings from Ne nucleus. Lorentz-covariant scalar and time-like vector potentials are used as direct optical potentials and the first-order vibrational collective model is used for the transition optical potentials to describe the high-lying excited vibrational collective states. The complicated Dirac coupled channel equations are solved phenomenologically using a sequential iteration method by varying the optical potential and the deformation parameters. Relativistic Dirac coupled channel calculations are able to describe the high-lying excited states of the vibrational bands in Ne clearly better than the nonrelativistic coupled channel calculations. The channel-coupling effects of the multistep process for the excited states of the vibrational bands are investigated. The deformation parameters obtained from the Dirac phenomenological calculations for the high-lying vibrational excited states in Ne are found to agree well with those obtained from the nonrelativistic calculations using the same Woods-Saxon potential shape.

    Comments:
    14 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:1407.5441
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1511.01729 [pdf]
    J.Korean Phys.Soc.(2015)·0 citations
  6. 06

    [Submitted on 5 Nov 2015]

    Open-Shell Nuclei and Excited States from Multi-Reference Normal-Ordered Hamiltonians

    Eskendr Gebrerufael · Angelo Calci · Robert Roth

    We discuss the approximate inclusion of three-nucleon interactions into ab initio nuclear structure calculations using a multi-reference formulation of normal ordering and Wick's theorem. Following the successful application of single-reference normal ordering for the study of ground states of closed-shell nuclei, e.g., in coupled-cluster theory, multi-reference normal ordering opens a path to open-shell nuclei and excited states. Based on different multi-determinantal reference states we benchmark the truncation of the normal-ordered Hamiltonian at the two-body level in no-core shell-model calculations for p-shell nuclei, including 6-Li, 12-C, and 10-B. We find that this multi-reference normal-ordered two-body approximation is able to capture the effects of the 3N interaction with sufficient accuracy, both, for ground-state and excitation energies, at the computational cost of a two-body Hamiltonian. It is robust with respect to the choice of reference states and has a multitude of applications in ab initio nuclear structure calculations of open-shell nuclei and their excitations as well as in nuclear reaction studies.

    Comments:
    6 pages, 4 figures, v2: update to published version
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1511.01857 [pdf]
    PRC(2016)·46 citations

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first authorsco-authorsvia INSPIRE