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Nuclear Theory·nucl-th

Friday·February 18, 2022

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 17 Feb 2022]

    Effects of triaxiality and pairing interaction on fission barriers of actinide nuclei studied by density-dependence relativistic mean-field theory

    Taiki Kouno · Chikako Ishizuka · Kazuki Fujio · Tsunenori Inakura · Satoshi Chiba

    We employ density-dependent relativistic mean-field theory to study how the triaxiality and pairing interaction affect the inner fission barriers of actinide nuclei. It was found that triaxiality reduced the inner fission barriers and improved agreement with experimental values for many actinides. However, about 1-2 MeV discrepancy to the experimental values still remained for some of the considered nuclei. Such a discrepancy could be made further smaller by increasing the BCS pairing strength parameter. In this work, we demonstrated that adjusting the paring strength was effective to reproduce the experimental inner fission barriers as well as "pairing rotational energy" and binding energy in a consistent manner for nuclei where the effect of the triaxiality on the inner fission barriers was significant.

    Comments:
    13 pages, 6 figures, 3 tables, IJMPE accepted
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2202.08654 [pdf]
    IJMPE(2022)·1 citation
  2. 02

    [Submitted on 17 Feb 2022]

    Is first-order relativistic hydrodynamics in general frame stable and causal for arbitrary interaction?

    Rajesh Biswas🇮🇳 · Sukanya Mitra🇮🇳 · Victor Roy🇮🇳

    We derive a first-order, stable and causal, relativistic hydrodynamic theory from the microscopic kinetic equation using the gradient expansion technique in a general frame. The general frame is introduced from the arbitrary matching conditions for hydrodynamic fields. The interaction is introduced in the relativistic Boltzmann equation through the momentum-dependent relaxation time approximation (MDRTA) with the proposed collision operator that preserves the conservation laws. We demonstrate here for the first time that not only the general frame choice, but also the momentum dependence of microscopic interaction rate, captured through MDRTA, is imperative for producing the essential field corrections that give rise to a causal and stable first-order relativistic theory.

    Comments:
    6 pages, 3 figures, Accepted for publication in Physical Review D Letter
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2202.08685 [pdf]
    PRD(2022)·27 citations
  3. 03

    [Submitted on 17 Feb 2022]

    Effects of isoscalar- and isovector-scalar meson mixing on neutron star structure

    Fan Li🇨🇳 · Bao-Jun Cai🇨🇳 · Ying Zhou🇨🇳 · Wei-Zhou Jiang🇮🇹 · Lie-Wen Chen🇨🇳

    Based on the accurately calibrated interaction FSUGold, we show that including isovector scalar meson and its coupling to isoscalar scalar meson in the relativistic mean field (RMF) model can soften the symmetry energy at intermediate densities while stiffen the at high densities. We find this new RMF model can be simultaneously compatible with (1) the constraints on the equation of state of symmetric nuclear matter at suprasaturation densities from flow data in heavy-ion collisions, (2) the neutron skin thickness of Pb from the PREX-II experiment, (3) the largest mass of neutron star (NS) reported so far from PSR J0740+6620, (4) the limit of for the dimensionless tidal deformability of the canonical 1.4 NS from the gravitational wave signal GW170817, (5) the mass-radius relation of PSR J0030+0451 and PSR J0740+6620 measured by NICER, and thus remove the tension between PREX-II and GW170817 observed in the conventional RMF model.

    Comments:
    9 pages, 2 figures, 2 tables. Results of finite nuclei added. Accepted version to appear in ApJ
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2202.08705 [pdf]
    ApJ(2022)·49 citations
  4. 04

    [Submitted on 17 Feb 2022]

    Pure gauge theories and spatial periodicity

    Thomas D. Cohen🇺🇸

    Properties of pure gauge theories in thermal equilibrium as calculated via standard functional integral treatments are mathematically identical to ground state properties of a theory with spatially-periodic boundary conditions imposed on the gauge fields. Such a theory has states that have no analog in a theory in which only physical observables associated with gauge-invariant operators are required to be periodic, rather than the gauge fields themselves; these states are in topological sectors that do not exist in the unconstrained theory. The topology arises because the boundary conditions in the functional integral are gauge invariant on a cylinder but not in the unconstrained theory.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2202.08745 [pdf]
    1 citation

Affiliations

first authorsco-authorsvia INSPIRE