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Nuclear Theory·nucl-th

Thursday·November 7, 2019

3 papers—3 primary·0 cross-listed

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  1. 01

    [Submitted on 6 Nov 2019]

    Microscopic core-quasiparticle coupling model for spectroscopy of odd-mass nuclei with octupole correlations

    W. Sun · S. Quan · Z. P. Li · J. Zhao · T. Niksic · D. Vretenar

    [Background] Predictions of spectroscopic properties of low-lying states are critical for nuclear structure studies. Theoretical methods can be particularly involved for odd-mass nuclei because of the interplay between the unpaired nucleon and collective degrees of freedom. Only a few models have been developed for systems in which octupole collective degrees of freedom play a role. [Purpose] We aim to predict spectroscopic properties of odd-mass nuclei characterized by octupole shape deformation, employing a model that describes single-particle and collective degrees of freedom within the same microscopic framework. [Method] A microscopic core-quasiparticle coupling (CQC) model based on the covariant density functional theory is developed, which includes collective excitations of even-mass core nuclei and single-particle states of the odd nucleon, calculated using a quadrupole-octupole collective Hamiltonian combined with a constrained reflection-asymmetric relativistic Hartree-Bogoliubov model. [Results] Model predictions for low-energy excitation spectra and transition rates of odd-mass radium isotopes Ra are shown to be in good agreement with available data. [Conclusions] A microscopic CQC model based on covariant density functional theory has been developed for odd-mass nuclei characterized by both quadrupole and octupole shape deformations. Theoretical results reproduce data in odd-mass Ra isotopes and provide useful predictions for future studies of octupole correlations in nuclei and related phenomena.

    Comments:
    14 pages, 6 figures, 5 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1911.02422 [pdf]
    PRC(2019)·21 citations
  2. 02

    [Submitted on 5 Nov 2019]

    Diffusion of heavy quarks in the early stage of high-energy nuclear collisions at energies available at the BNL Relativistic Heavy Ion Collider and at the CERN Large Hadron Collider

    J. H. Liu🇨🇳 · S. Plumari🇮🇹 · S. K. Das🇮🇳 · V. Greco🇮🇹 · M. Ruggieri🇨🇳

    We study the diffusion of charm and beauty in the early stage of high energy nuclear collisions at RHIC and LHC energies, considering the interaction of these heavy quarks with the evolving Glasma by means of the Wong equations. In comparison with previous works, we add the longitudinal expansion as well as we estimate the effect of energy loss due to gluon radiation. We find that heavy quarks diffuse in the strong transverse color fields in the very early stage (0.2-0.3 fm/c) and this leads to a suppression at low and enhancement at intermediate low . The shape of the observed nuclear suppression factor obtained within our calculations is in qualitative agreement with the experimental results of the same quantity for mesons in proton-nucleus collisions. We compute the nuclear suppression factor in nucleus-nucleus collisions as well, for both charm and beauty, finding a substantial impact of the evolving Glasma phase on these, suggesting that initialization of heavy quarks spectra in the quark-gluon plasma phase should not neglect the early evolution in the strong gluon fields.

    Comments:
    12 pages, 8+1 figures. Discussion on the scaling of parameters from three to two colors added in Appendix. Matches published version. arXiv admin note: text overlap with arXiv:1805.09617
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1911.02480 [pdf]
    PRC(2020)·40 citations
  3. 03

    [Submitted on 6 Nov 2019]

    Vacuum effects on the properties of nuclear matter under an external magnetic field

    R. M. Aguirre🇦🇷

    The effects of the Dirac sea of the nucleons are investigated within a covariant model of the hadronic interaction. We extend the usual Mean Field Approximation and present a procedure to deal with divergences which are proportional to polynomials on the magnetic field intensity. For this purpose a nucleon propagator is used which takes accounts of the full effect of the magnetic field as well as the presence of the anomalous magnetic moments of both protons and neutrons. We examine single particle properties and bulk thermodynamical quantities and conclude that within a reasonable range of densities and magnetic intensities the effects found are moderate.

    Comments:
    matches the published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1911.02531 [pdf]
    PRC(2019)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE