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Nuclear Theory·nucl-th

Friday·May 12, 2023

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    [Submitted on 11 May 2023]

    Skyrme crystals, nuclear matter and compact stars

    Christoph Adam🇪🇸 · Alberto Garcia Martin-Caro🇪🇸 · Miguel Huidobro🇪🇸 · Andrzej Wereszczynski🇵🇱

    A general review of the crystalline solutions of the generalized Skyrme model and their application to the study of cold nuclear matter at finite density and the Equation of State (EOS) of neutron stars is presented. For the relevant range of densities, the ground state of the Skyrme model in the three torus is shown to correspond to configurations with different symmetries, with a sequence of phase transitions between such configurations. The effects of nonzero finite isospin asymmetry are taken into account by the canonical quantization of isospin collective coordinates, and some thermodynamical and nuclear observables (such as the symmetry energy) are computed as a function of the density. We also explore the extension of the model to accommodate strange degrees of freedom, and find a first order transition for the condensation of kaons in the Skyrme crystal background in a thermodynamically consistent, non-perturbative way. Finally, an approximate EOS of dense matter is constructed by fitting the free parameters of the model to some nuclear observables close to saturation density, which are particularly relevant for the description of nuclear matter. The resulting neutron star mass-radius curves already reasonably satisfy current astrophysical constraints.

    Comments:
    54 pages, 28 figures, review
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2305.06639 [pdf]
    Symmetry(2023)·20 citations
  2. 02

    [Submitted on 11 May 2023]

    Relativistic approach for the determination of nuclear and neutron star properties in consideration of PREX-II results

    Virender Thakur🇮🇳 · Raj Kumar🇮🇳 · Pankaj Kumar🇮🇳 · Mukul Kumar🇮🇳 · C. Mondal🇫🇷 · Kaixuan Huang🇨🇳 · Jinniu Hu🇨🇳 · B. K. Agrawal🇮🇳 · Shashi K. Dhiman🇮🇳

    The bulk properties of nuclear matter and neutron stars with the newly generated relativistic interaction DBHP are investigated which provides an opportunity to modify the coupling parameters keeping in view the finite nuclei, nuclear matter, PREX-II data for neutron skin thickness in Pb and astrophysical constraints. The relativistic interaction has been generated by including all possible self and mixed interactions between , , and -meson up to the quartic order satisfying the naturalness behavior of parameters. A covariance analysis is performed to assess the statistical uncertainties on the model parameters and observables of interest along with correlations amongst them. We obtained a value of neutron skin thickness for Pb nucleus = 0.24 0.02 fm. The maximum gravitational mass of neutron star and radius corresponding to the canonical mass () come out to be 2.03 0.04 M and 13.39 0.41 km respectively. The dimensionless tidal deformability, for a neutron star is also analyzed.

    Comments:
    12 pages, 10 Figures. arXiv admin note: substantial text overlap with arXiv:2305.05937
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2305.06667 [pdf]
    PRC(2023)·18 citations
  3. 03

    [Submitted on 11 May 2023]

    How chiral forces shape neutron-rich Ne and Mg nuclei

    Andreas Ekström · Christian Forssén · G. Hagen · G. R. Jansen · T. Papenbrock · Z. H. Sun

    We compute the structure of the exotic even nuclei Ne and Mg using interactions from chiral effective field theory (EFT). Our results for the ground-state rotational bands in Ne and Mg agree with data. We predict a well-deformed Ne and find that Mg exhibits an oblate deformed band close to the prolate ground-state, indicating the emergence of shape co-existence at the neutron dripline. A global sensitivity analysis shows that the subleading singlet -wave contact and a pion-nucleon coupling strongly impact deformation in chiral EFT.

    Comments:
    13 pages, 8 figures, supplemental material
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2305.06955 [pdf]
    13 citations
  4. 04

    [Submitted on 11 May 2023] (cross-list from hep-ph)

    Elastic proton-neutron and antiproton-neutron scattering in holographic QCD

    Akira Watanabe🇨🇳 · Sayed Anwar Sirat🇨🇳 · Zhibo Liu🇨🇳

    The total and differential cross sections of the elastic proton-neutron and antiproton-neutron scattering are studied in a holographic QCD model, focusing on the Regge regime. Taking into account the Pomeron and Reggeon exchange, which are described by the Reggeized spin-2 glueball and vector meson propagator respectively, those cross sections are obtained. It is presented that the currently available experimental data of the total cross sections can be well described within the model. Once a single adjustable parameter is determined with the total cross section data, the differential cross sections can be calculated without any additional parameters. Although the available differential cross section data are limited, it is found that our predictions are consistent with those.

    Comments:
    14 pages, 4 figures, typos corrected
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2305.06700 [pdf]
    EPJC(2023)·6 citations
  5. 05

    [Submitted on 11 May 2023] (cross-list from physics.atom-ph)

    Screening of electric field and nuclear EDM in non-stationary states of atoms and molecules

    V.V. Flambaum🇦🇺

    According to the Schiff theorem, an external electric field vanishes at atomic nucleus in a neutral atom in a stationary state, i.e. it is completely shielded by electrons. This makes a nuclear electric dipole moment (EDM) unobservable. We show that if atom or molecule is not in a stationary state (e.g. in a superposition of two stationary states), electric field on the nucleus is not zero and interaction with nuclear EDM does not vanish. In molecules this effect is enhanced by the ratio of nuclear mass to to electron mass, , since nuclei in a molecule are slow (compare to electrons) and do not provide efficient screening in a non-stationary environment. Electric field on the nucleus may also affect nuclear reactions.

    Comments:
    arXiv admin note: substantial text overlap with arXiv:1804.08898
    Subjects:
    Atomic Physics (physics.atom-ph); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2305.06742 [pdf]
    PRA(2023)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE