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Nuclear Theory·nucl-th

Monday·October 2, 2017

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 01

    [Submitted on 28 Sept 2017]

    Difference in proton radii of mirror nuclei as a possible surrogate for the neutron skin

    Junjie Yang · J. Piekarewicz

    It has been recently suggested that differences in the charge radii of mirror nuclei are proportional to the neutron-skin thickness of neutron-rich nuclei and to the slope of the symmetry energy [B.A. Brown Phys. Rev. Lett. 119, 122502 (2017)]. The determination of the neutron skin has important implications for nuclear physics and astrophysics. Although the use of electroweak probes provides a largely model-independent determination of the neutron skin, the experimental challenges are enormous. Thus, the possibility that differences in the charge radii of mirror nuclei may be used as a surrogate for the neutron skin is a welcome alternative. To test the validity of this assumption we perform calculations based on a set of relativistic energy density functionals that span a wide region of values of . Our results confirm that the difference in charge radii of various neutron-deficient nickel isotopes and their corresponding mirror nuclei is indeed strongly correlated to both the neutron-skin thickness and . Moreover, given that various neutron-star properties are also sensitive to , a data-to-data relation emerges between the difference in charge radii of mirror nuclei and the radius of low-mass neutron stars.

    Comments:
    5 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Experiment (nucl-ex)
    arXiv:
    1709.10182 [pdf]
    PRC(2018)·52 citations
  2. 02

    [Submitted on 29 Sept 2017]

    Relativistic baryon-baryon interactions in chiral perturbation theory

    Xiu-Lei Ren🇨🇳 · Kai-Wen Li🇨🇳 · Li-Sheng Geng🇨🇳

    We report on the recent studies of leading order baryon-baryon interactions in covariant baryon chiral perturbation theory. In the strangeness sector, one can achieve a rather good description of the Nijmegen phase shifts with angular momenta , particularly the and partial waves, comparable with the next-to-leading order (NLO) heavy baryon approach. In the strangeness hyperon-nucleon sector, the best fit of the 36 scattering data is similar to the sophisticated phenomenological models and the NLO heavy baryon approach.

    Comments:
    5 pages, 3 figures; presented by Li-Sheng Geng at the 11th APCTP - BLTP JINR - PNPI NRC KI - SPbU Joint Workshop, July 23-28, Saint-Petersburg
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1709.10266 [pdf]
    1 citation
  3. 03

    [Submitted on 29 Sept 2017]

    Charge-exchange dipole excitations in neutron-rich nuclei: , anti-analog pygmy, and anti-analog giant resonances

    Kenichi Yoshida

    The occurrence of the low-lying charge-exchange non spin-flip dipole modes below the giant resonance in neutron-rich nuclei is predicted on the basis of nuclear density functional theory. The ground and excited states are described in the framework of the self-consistent Hartree-Fock-Bogoliubov and the proton-neutron quasiparticle-random-phase approximation employing a Skyrme-type energy density functional. The model calculations are performed for the spherical neutron-rich Ca, Ni, and Sn isotopes. It is found that the low-lying states appear sensitively to the shell structure associated with the excitation below the Gamow-Teller states. Furthermore, the pygmy resonance emerges below the giant resonance when the neutrons occupy the low- orbitals analogous to the pygmy resonance seen in the electric dipole response.

    Comments:
    5 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1709.10272 [pdf]
    PRC(2017)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE