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Nuclear Theory·nucl-th

Wednesday·November 10, 2021

9 papers—3 primary·6 cross-listed

All9Primary3Cross-lists6
  1. 01

    [Submitted on 8 Nov 2021]

    Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model

    Maxim Mai🇺🇸 · Michael Döring🇺🇸 · Carlos Granados🇺🇸 · Helmut Haberzettl🇺🇸 · Jackson Hergenrather🇺🇸 · Ulf-G. Meißner🇩🇪 · Deborah Rönchen🇩🇪 · Igor Strakovsky🇺🇸 · Ron Workman🇺🇸

    Pion and eta electroproduction data are jointly analyzed for the first time, up to a center-of-mass energy of 1.6 GeV. The framework is a dynamical coupled-channel model, based on the recent Jülich-Bonn-Washington analysis of pion electroproduction data for the same energy range. Comparisons are made to a number of single-channel eta electroproduction fits. By comparing multipoles of comparable fit quality, we find some of these amplitudes are well determined over the near-threshold region, while others will require fits over an extended energy range.

    Comments:
    18 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2111.04774 [pdf]
    PRC(2022)·31 citations
  2. 02

    [Submitted on 8 Nov 2021]

    Global performance of covariant density functional theory in description of charge radii and related indicators

    A. V. Afanasjev · U. C. Perera · P. Ring

    A short review of existing efforts to understand charge radii and related indicators on a global scale within the covariant density functional theory (CDFT) is presented. Using major classes of covariant energy density functionals (CEDFs), the global accuracy of the description of experimental absolute and differential charge radii within the CDFT framework has been established. This assessment is supplemented by an evaluation of theoretical statistical and systematic uncertainties in the description of charge radii. New results on the accuracy of the description of differential charge radii in deformed actinides and light superheavy nuclei are presented and the role of octupole deformation in their reproduction is evaluated. Novel mechanisms leading to odd-even staggering in charge radii are discussed. Finally, we analyze the role of self-consistency effects in an accurate description of differential charge radii.

    Comments:
    15 pages, 6 figures and 1 Table. to appear in the Proceedings of the workshop on Shapes and Dynamics of Atomic Nuclei: Contemporary Aspects (SDANCA21), Sofia, Bulgaria, 16-18 September 2021, ed. N. Minkov. to be published in Bulgarian Journal of Physics
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2111.04782 [pdf]
    Bulg.J.Phys.(2021)·2 citations
  3. 03

    [Submitted on 9 Nov 2021]

    Pairing dynamics and solitonic excitations in collisions of medium-mass, identical nuclei

    Piotr Magierski · Andrzej Makowski · Matthew C. Barton · Kazuyuki Sekizawa · Gabriel Wlazłowski

    We present results of collisions of Zr+Zr and Zr+Zr obtained within time-dependent density functional theory (TDDFT) extended to superfluid systems, known as time-dependent superfluid local density approximation (TDSLDA). We discuss qualitatively new features occurring in collisions of two superfluid nuclei at energies in the vicinity of the Coulomb barrier. We show that a \textit{solitonic excitation} -- an abrupt pairing phase distortion -- reported previously [P.~Magierski et al., Phys. Rev. Lett. \textbf{119}, 042501 (2017)], increases the barrier for capture generating effective repulsion between colliding nuclei. Moreover we demonstrate that pairing field leads to qualitatively different dynamics at the Coulomb barrier which manifests itself in a slower evolution of deformation towards a compact shape. Last but not least, we show that magnitude of pairing correlations can be dynamically enhanced after collision. We interpret it as a dynamically induced symmetry breaking, which leads to large-amplitude oscillations of pairing field and bear similarity to the pairing Higgs mechanism.

    Comments:
    13 pages (including supplemental material), 6 figures
    Subjects:
    Nuclear Theory (nucl-th); Quantum Gases (cond-mat.quant-gas); Superconductivity (cond-mat.supr-con); Nuclear Experiment (nucl-ex)
    arXiv:
    2111.05135 [pdf]
    PRC(2022)·14 citations

Affiliations

first authorsco-authorsvia INSPIRE