PaperPanorama
FAQ

Nuclear Theory·nucl-th

Monday·November 7, 2016

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 01

    [Submitted on 4 Nov 2016]

    The rapidity and thermal motion induced transverse momentum distributions of identified charged particles produced in Au-Au collisions at RHIC energies

    Zhi-Jin Jiang🇨🇳 · Jia-Qi Hui🇨🇳 · Yu Zhang🇨🇳

    It is widely believed that the quark-gluon plasma (QGP) might be formed in the current heavy ion collisions. It is also widely recognized that the relativistic hydrodynamics is one of the best tools for describing the process of expansion and particlization of QGP. In this paper, by taking into account the effects of thermal motion, a hydrodynamic model including phase transition from QGP state to hadronic state is used to analyze the rapidity and transverse momentum distributions of identified charged particles produced in heavy ion collisions. A comparison is made between the theoretical results and experimental data. The theoretical model gives a good description to the corresponding measurements made in Au-Au collisions at RHIC energies.

    Comments:
    13 pages, 3 figures, 47 references
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1611.01247 [pdf]
    Adv.High Energy Phys.(2017)·2 citations
  2. 02

    [Submitted on 4 Nov 2016]

    Radiative capture reaction for Ne formation within a full three-body model

    J. Casal · E. Garrido · R. de Diego · J. M. Arias · M. Rodríguez-Gallardo

    Background: The breakout from the hot Carbon-Nitrogen-Oxigen (CNO) cycles can trigger the rp-process in type I x-ray bursts. In this environment, a competition between and the two-proton capture reaction is expected. Purpose: Determine the three-body radiative capture reaction rate for formation including sequential and direct, resonant and non-resonant contributions on an equal footing. Method: Two different discretization methods have been applied to generate Ne states in a full three-body model: the analytical transformed harmonic oscillator method and the hyperspherical adiabatic expansion method. The binary --O interaction has been adjusted to reproduce the known spectrum of the unbound F nucleus. The dominant contributions to the reaction rate have been calculated from the inverse photodissociation process. Results: Three-body calculations provide a reliable description of Ne states. The agreement with the available experimental data on Ne is discussed. It is shown that the reaction rates computed within the two methods agree in a broad range of temperatures. The present calculations are compared with a previous theoretical estimation of the reaction rate. Conclusions: It is found that the full three-body model provides a reaction rate several orders of magnitude larger than the only previous estimation. The implications for the rp-process in type I x-ray bursts should be investigated.

    Comments:
    10 pages, 10 figures. Corrected version
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1611.01295 [pdf]
    PRC(2016)·19 citations
  3. 03

    [Submitted on 4 Nov 2016]

    Symmetry-unrestricted Skyrme mean-field study of heavy nuclei

    W. Ryssens · P.-H. Heenen · M. Bender

    In the light of recent experimental developments, increasing attention is devoted to nuclear phenomena related to rotational excitations of exotic intrinsic nuclear configurations that often lack symmetries present in the majority of nuclei. Examples include configurations with a non-vanishing octupole moment. In order to describe this kind of states, we have developed a new computer code to solve the self-consistent mean-field equations, able to use most of today's effective Skyrme interactions and working in coordinate-space. We report on the development of MOCCa, a code based on the same principles as EV8, but offering the user individual control on many symmetry assumptions. In addition, the HF+BCS pairing treatment of EV8 has been generalised to the full machinery of Hartree-Fock-Bogoliubov transformations. We discuss as example the static fission barrier of Ra, prefacing extended studies in the region, using the recent series of Skyrme parameterizations SLy5s1 through SLy5s8.

    Comments:
    Accepted for publication in the proceedings of the 54th International Winter Meeting on Nuclear Physics in Bormio, Italy 2016; New version uses the published functionals SLy5s1 through SLy5s8 instead of preliminary fits
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1611.01300 [pdf]
    PoS(2016)·1 citation
  4. 04

    [Submitted on 4 Nov 2016]

    Hadron yields, the chemical freeze-out and the QCD phase diagram

    A. Andronic🇩🇪 · P. Braun-Munzinger🇩🇪 · K. Redlich🇵🇱 · J. Stachel🇩🇪

    We present the status of the chemical freeze-out, determined from fits of hadron yields with the statistical hadronization (thermal) model, with focus on the data at the LHC. A description of the yields of hadrons containing light quarks as well as the application of the model for the production of the J/ meson is presented. The implications for the QCD phase diagram are discussed.

    Comments:
    6 pages, 5 figures; proceedings of Strangeness in Quark Matter 2016 conference; v2: correction of an inadvertent wording
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1611.01347 [pdf]
    J.Phys.Conf.Ser.(2017)·68 citations
  5. 05

    [Submitted on 4 Nov 2016]

    Mirror and triplet displacement energies within nuclear DFT: numerical stability

    Pawel Baczyk · Jacek Dobaczewski · Maciej Konieczka · Takashi Nakatsukasa · Koichi Sato · Wojciech Satula

    Isospin-symmetry-violating class II and III contact terms are introduced into the Skyrme energy density functional to account for charge dependence of the strong nuclear interaction. The two new coupling constants are adjusted to available experimental data on triplet and mirror displacement energies, respectively. We present preliminary results of the fit, focusing on its numerical stability with respect to the basis size.

    Comments:
    talk presented at the Zakopane Conference on Nuclear Physics, Zakopane, Poland, August 28 - September 4, 2016
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1611.01392 [pdf]
    Acta Phys.Polon.B(2017)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE