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Nuclear Theory·nucl-th

Monday·August 7, 2017

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 01

    [Submitted on 3 Aug 2017]

    Mechanical Analogy for the Wave of Nuclear Burning

    V.V. Urbanevich · I.V. Sharph · V.A. Tarasov · V.D. Rusov

    We consider a model of neutron-nuclear wave burning. The wave of nuclear burning of the medium is initiated by an external neutron source and is the basis for the new generation reactors -- the so-called "traveling-wave reactors". We develop a model of nuclear wave burning, for which it is possible to draw an analogy with a mechanical dissipative system. Within the framework of the new model, we show that two burning modes are possible depending on the control parameters: a traveling autowave and a wave driven by an external neutron source. We find the autowave to be possible for certain neutron energies only, and the wave velocity has a continuous spectrum bounded below.

    Comments:
    23 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1708.01322 [pdf]
    EPJ Nuclear Sci.Technol.(2020)·0 citations
  2. 02

    [Submitted on 4 Aug 2017]

    Effective interactions of hyperons and mass-radius relation of neutron stars

    Yeunhwan Lim🇺🇸 · Chang-Hwan Lee🇰🇷 · Yongseok Oh🇰🇷

    We examine the role of hyperons in a neutron star based on the relativistic mean field approach. For nuclear matter below 1.5 times the normal nuclear density we constrain the model parameters by using the symmetric nuclear matter properties and theoretical investigations for neutron matter in the literature. We then extend the model to higher densities by including hyperons and isoscalar vector mesons that contain strangeness degree of freedom. We confirm that the meson induces a repulsive force and hardens the equation of state. The hardening arising from the meson compensates the softening from the existence of hyperons. The flavor SU(3) and spin-flavor SU(6) relations are examined as well. We found that the coupling constants fitted by neutron matter properties could yield high enough maximum mass of a neutron star and the obtained results satisfy both the mass and radius constraints. The onset of the hyperon direct Urca process in neutron stars is also investigated using our parametrization.

    Comments:
    15 pages, REVTeX, revised version
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1708.01364 [pdf]
    PRD(2018)·19 citations
  3. 03

    [Submitted on 4 Aug 2017]

    Thermodynamically consistent formulation of quasiparticle viscous hydrodynamics

    Radoslaw Ryblewski🇵🇱

    A novel formulation of second-order relativistic viscous fluid dynamics based on the effective Boltzmann equation for quasi-particles with medium-dependent masses is briefly reviewed.~The evolution equations for the shear and bulk dissipative corrections, and the corresponding transport coefficients, are presented. Resulting approach allows for thermodynamically-consistent incorporation of lattice QCD equation of state in the fluid dynamical framework.

    Comments:
    6 pages; Conference proceedings from Excited QCD 2017, 7-13 May 2017, Sintra, Portugal
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1708.01449 [pdf]
    Acta Phys.Polon.Supp.(2017)·7 citations
  4. 04

    [Submitted on 4 Aug 2017]

    The symmetry energy parameter of relativistic mean-field models

    Mariana Dutra · Odilon Lourenço · Or Hen · Eliezer Piasetzky · Débora P. Menezes

    The relativistic mean-field models tested in previous works against nuclear matter experimental values, critical parameters and macroscopic stellar properties are revisited and used in the evaluation of the symmetry energy parameter obtained in three different ways. We have checked that independent of the choice made to calculate the values, a trend of linear correlation is observed between and the symmetry energy () and a more clear linear relationship is established between and the slope of the symmetry energy (). These results directly contribute to the arising of other linear correlations between and the neutron star radii of and , in agreement with recent findings. Finally, we have found that short-range correlations induce two specific parametrizations, namely, IU-FSU and DD-ME, simultaneouslycompatible with the neutron star mass constraint of and with the overlap band for the region, to present in the range of .

    Comments:
    11 pages, 6 figures. Version accepted for publication in Chinese Physics C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1708.01521 [pdf]
    CPC(2018)·8 citations
  5. 05

    [Submitted on 4 Aug 2017]

    Neutron- scattering: Towards including realistic interactions

    A. Deltuva

    Low-energy neutron-C scattering is studied in the three-body C model using a realistic potential and a number of shallow and deep -C potentials, the latter supporting deeply-bound Pauli-forbidden states that are projected out. Exact Faddeev-type three-body scattering equations for transition operators including two- and three-body forces are solved in the momentum-space partial-wave framework. Phase shift, inelasticity parameter, and cross sections are calculated. For the elastic -C scattering in the partial wave the signatures of the Efimov physics, i.e., the pole in the effective-range expansion and the elastic cross section minimum, are confirmed for both shallow and deep models, but with clear quantitative differences between them, indicating the importance of a proper treatment of deeply-bound Pauli-forbidden states. In contrast, the inelasticity parameter is mostly correlated with the asymptotic normalization coefficient of the C bound state. Finally, in the regime of very weak C binding and near-threshold (bound or virtual) excited C state the standard Efimovian behaviour of the -C scattering length and cross section was confirmed, resolving the discrepancies between earlier studies by other authors [I. Mazumdar, A. R. P. Rau, V. S. Bhasin, Phys. Rev. Lett. 97 (2006) 062503; M. T. Yamashita, T. Frederico, L. Tomio, Phys. Rev. Lett. 99 (2007) 269201].

    Comments:
    6 figures
    Subjects:
    Nuclear Theory (nucl-th); Quantum Gases (cond-mat.quant-gas); Nuclear Experiment (nucl-ex)
    arXiv:
    1708.01554 [pdf]
    PLB(2017)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE