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Nuclear Theory·nucl-th

Wednesday·June 17, 2026

13 papers—6 primary·7 cross-listed

All13Primary6Cross-lists7
  1. 01

    [Submitted on 15 Jun 2026]

    Quantum Resources and Wigner Symmetry in Nucleon-Nucleon Scattering from Effective Field Theory

    Ian Low🇺🇸 · Thomas R. Richardson🇺🇸 · Sokratis Trifinopoulos🇨🇭

    We study quantum resources in the spin degrees of freedom, such as entanglement, stabilizer magic, and non-local magic, in low-energy nucleon-nucleon scattering through next-to-leading order in pionless effective field theory. Treating each nucleon spin as a qubit, we calculate the corresponding resource-generating powers of the scattering operator at generic center-of-mass momentum and scattering angle . The analysis retains - and -wave channels generated by two-derivative contact interactions. When the microscopic physics exhibits Wigner's spin-flavor symmetry, the neutron-proton amplitude becomes proportional to the spin-space identity operator and therefore generates no new resources after scattering, extending an observation previously made for leading-order -wave scattering. The same-nucleon channel remains resource-generating because constraints from identical particles project out part of the Hilbert space. These results show how enhanced symmetries, partial-wave structure, and resource generation are intertwined in low-energy two-body scattering.

    Comments:
    12 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Quantum Physics (quant-ph)
    arXiv:
    2606.17148 [pdf]
    4 citations
  2. 02

    [Submitted on 15 Jun 2026]

    Heaven and Earth: Connecting Jefferson Lab to the Cosmos

    J. Piekarewicz🇺🇸

    The nuclear equation of state (EOS) serves as the fundamental bridge between atomic nuclei and neutron stars--objects that differ in size by almost 20 orders of magnitude. Central to this connection is the nuclear symmetry energy, which controls both the neutron skin thickness of heavy nuclei and the radii of neutron stars. Recent electroweak experiments at Jefferson Lab, specifically PREX, have provided the cleanest terrestrial constraints on the EOS near saturation density. Complementary to neutron skins is the isovector giant dipole resonance, particularly the electric dipole polarizability. This contribution discusses the implications of these measurements on the nuclear EOS and the role of upcoming electroweak capabilities at Jefferson Lab in addressing their impact on the structure and composition of neutron stars.

    Comments:
    9 pages, 2 figures, submitted to the proceedings of the International Workshop on Low Energy Electron Positron Physics at Jefferson Lab (LEEPP2026)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2606.17169 [pdf]
    0 citations
  3. 03

    [Submitted on 16 Jun 2026]

    Improving the efficiency of Hartree--Fock--Bogoliubov solvers in 3D space

    Alessandro Sala · Gianluca Colò

    The solution of the three-dimensional Schrödinger-like single-particle equations that appear in Kohn Sham density functional theory, as well as in other contexts, for large systems and without any symmetry, requires efficient and robust numerical algorithms. Conventional methods suffer from slow convergence and require careful tuning, depending on the spatial discretization. Conjugate gradient methods combined with preconditioning have been proposed to accelerate the convergence of symmetry-unrestricted Skyrme energy density functionals; however, their effectiveness may depend on the design of a preconditioner. In this work, we introduce the generalized conjugate gradient method for the self-consistent solution of the Hartree--Fock--Bogoliubov equations, which eliminates the need for problem-dependent preconditioning and improves the convergence speed of currently available methods. The performance of the proposed algorithm is demonstrated on representative nuclear systems, showing improved convergence behavior compared to standard approaches. The proposed method ultimately provides a promising tool for systematic studies of superheavy, strongly deformed, and drip-line nuclei.

    Comments:
    13 pages, 8 figures, to be submitted to Physical Review C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2606.17652 [pdf]
    0 citations
  4. 04

    [Submitted on 16 Jun 2026]

    Mass Probe of Tetrahedral Symmetry in Atomic Nuclei

    F. F. Xu · P. W. Zhao

    Tetrahedral symmetry has long been predicted as an exotic shape degree of freedom in atomic nuclei, yet clear experimental manifestations remain elusive. We show that the triple binding energy difference can isolate a structural effect of tetrahedral symmetry in Zr. Using relativistic density functional theory solved on a three-dimensional lattice without symmetry restrictions, the experimental values for even-even Zr isotopes are well reproduced without adjustable parameters. While an enhancement of near is commonly attributed to proton-neutron correlations beyond the mean field, the pronounced nonmonotonic peak at emerges at the mean-field level only when the tetrahedral degree of freedom is included. Constraining the tetrahedral deformation to zero removes the peak and leads to clear deviations from experiment. The anomaly is traced to a well-localized tetrahedral minimum in Zr, supported by potential energy surfaces and characteristic single-particle level splittings. Calculations restricted to quadrupole and triaxial shapes fail to reproduce the localized enhancement, indicating that the effect is not a generic proton-neutron correlation but a symmetry-selective increase of proton-neutron binding associated with tetrahedral geometry. We therefore identify the anomaly in Zr as a structural mechanism distinct from the conventional Wigner-type enhancement and show that nuclear masses constitute a sensitive probe of tetrahedral symmetry.

    Comments:
    14 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2606.17728 [pdf]
    0 citations
  5. 05

    [Submitted on 16 Jun 2026]

    Probing the QCD Phase Structure with Dileptons from SIS to LHC Energies

    Adrian William Romero Jorge🇩🇪 · Taesoo Song🇩🇪 · Qi Zhou🇨🇳 · Elena Bratkovskaya🇩🇪

    We study the properties of strongly interacting matter at finite temperature and baryon chemical potential in relativistic heavy-ion collisions, with emphasis on dilepton probes of the QCD phase structure. The equilibrium QGP is described within the Dynamical QuasiParticle Model (DQPM), which reproduces the lattice-QCD equation of state and provides -dependent quasiparticle properties, transport coefficients, and thermal dilepton rates, including elastic and inelastic partonic processes. The dynamical evolution is modeled with the off-shell Parton--Hadron--String Dynamics (PHSD) transport approach, which consistently propagates partonic and hadronic degrees of freedom and incorporates chiral-symmetry restoration effects. We discuss the space--time evolution of heavy-ion collisions over a broad energy range and show that a small deconfined QGP core can already emerge at GeV. We present, for the first time, the baryon-chemical-potential dependence of QGP thermal dilepton radiation in PHSD and demonstrate that its influence increases toward lower collision energies. The excitation function indicates that thermal QGP radiation can exceed dileptons from correlated charm decays in central Au+Au collisions at -- GeV, making RHIC--BES and FAIR energies particularly promising for the direct observation of QGP electromagnetic radiation after subtraction of heavy-flavor and Drell--Yan contributions.

    Comments:
    sQM 2026 proceeding. 4 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Theory (hep-th)
    arXiv:
    2606.17764 [pdf]
    J.Subatomic Part.Cosmol.(2026)·0 citations
  6. 06

    [Submitted on 16 Jun 2026]

    Theoretical calculations on half-lives of spontaneous one-proton radioactivity

    Hanlin Wang · Zhen Wang · Zhongzhou Ren

    Research on the unstable nuclei beyond the nucleon drip line is an important method to study the nuclear interaction and structure in the extremely neutron-deficient or rich systems. Various nuclides beyond the proton drip line mainly decay through spontaneous one-proton emission. Using deformed Woods-Saxon potential, spin-orbit potential, and expanded Coulomb potential to construct the daughter-proton potential, the half-life data of various proton emitters are systematically calculated based on the quantum tunneling model and the microscopic Gamow state theory. By using nuclear data from different sources and comparing them with the measurements, the dependence of proton emission on decay energy and spectroscopic factors is evaluated. Additionally, based on previous observations, the half-life of the possibly lighter proton emitter in the fpg-shell below has been theoretically predicted. Our results are compiled into a comprehensive dataset of half-lives for both experimentally confirmed emitters (50 < Z < 84) and theoretically predicted emitters (30 < Z < 50), providing a useful reference for future experimental investigations related to the proton drip line. The datasets presented in this paper, including our results of calculation, are openly available at https://www.doi.org/10.57760/sciencedb.27551.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2606.17785 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE