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Nuclear Theory·nucl-th

Monday·February 9, 2026

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 01

    [Submitted on 25 Jan 2026]

    "Observations on the possible electromagnetic nature of nucleon interactions and pions" -- historical manuscript from 1969 by B. W. Ninham and C. Pask

    Mathias Boström🇵🇱 · Drew F. Parsons🇮🇹

    This manuscript presents an historical perspective prepared by Barry Ninham and Colin Pask in 1969 on the connection between quantum electrodynamics theory and nucleon interactions. A new theory of strong interactions based on electromagnetic considerations is proposed. Energy and force range magnitudes are correctly given. A new theory of the pion emerges and the pion mass and lifetime are calculated. No strong interaction coupling constant is required.

    Comments:
    7 pages, 1 image
    Subjects:
    Nuclear Theory (nucl-th); cond-mat.mtrl-sci (cond-mat.mtrl-sci); High Energy Physics — Phenomenology (hep-ph); History and Philosophy of Physics (physics.hist-ph)
    arXiv:
    2602.06058 [pdf]
    Substantia, 2025·1 citation
  2. 02

    [Submitted on 5 Feb 2026]

    Fixed-energy inverse scattering with radial basis function neural networks and its application to neutron-alpha interactions

    Gábor Balassa

    This paper proposes a data-driven method to solve the fixed-energy inverse scattering problem for radially symmetric potentials using radial basis function (RBF) neural networks in an open-loop control system. The method estimates the scattering potentials in the Fourier domain by training an appropriate number of RBF networks, while the control step is carried out in the coordinate space by using the measured phase shifts as control parameters. The system is trained by both finite and singular input potentials and is capable of modeling a great variety of scattering events. The method is applied to neutron-alpha scattering at 10 MeV incident neutron energy, where the underlying central part of the potential is estimated by using the measured l = 0, 1, 2 phase shifts as inputs. The obtained potential is physically sensible, and the recalculated phase shifts are within a few percent relative error.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2602.06086 [pdf]
    PTEP(2023)·6 citations
  3. 03

    [Submitted on 6 Feb 2026]

    Bayesian Constraints on the Neutron Star Equation of State with a Smooth Hadron-Quark Crossover

    Xavier Grundler🇺🇸 · Bao-An Li🇺🇸

    We perform a Bayesian inference of the dense-matter equation of state (EOS) within a unified framework that incorporates hadronic matter, quark matter, and a smooth hadron-to-quark crossover. The EOS is constrained using physical consistency conditions, gravitational wave data from GW170817, NICER mass versus radius measurements, and hypothetical future high-precision radius observations. In contrast to most previous studies that assume a sharp first-order phase transition or fix part of the EOS, we simultaneously infer hadronic, quark, and crossover parameters within a single statistical framework. We find that current observations strongly constrain the density dependence of the nuclear symmetry energy, particularly its slope and curvature. In contrast, the highest density hadronic parameters and quark-matter properties remain only weakly constrained. We further show that the trace anomaly exhibits a remarkably universal behavior across the accepted EOS ensemble and remains largely insensitive to current observational constraints. This indicates that the present data primarily probe the low to intermediate density EOS. At the same time, robust inference of quark matter and genuinely high-density physics will require next-generation precision radius measurements or complementary observables.

    Comments:
    Version accepted by Phys. Rev. D
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2602.06696 [pdf]
    PRD(2026)·3 citations
  4. 04

    [Submitted on 6 Feb 2026]

    Many-body effects on dense matter with hyperons at finite temperature

    Rafael Bán Jacobsen · Ricardo Luciano Sonego Farias · Veronica Dexheimer

    In this work, we present the first extension of the Many-Body Forces (MBF) Model to finite temperature. The MBF Model describes nuclear matter in a relativistic quantum hadrodynamics formalism that takes many-body forces into account through a field dependence of the nuclear interaction coupling constants. Assuming nuclear matter to be charge neutral, beta-equilibrated, and populated by the baryon octet, electrons, and muons, we explore the parameters of the model, three different hyperon coupling schemes (also introduced here for the first time in MBF), and temperature effects to describe basic properties of nuclear matter, including the speed of sound, compressibility, and adiabatic index. We also investigate the mass-radius relation of compact stars by solving the Tolman-Oppenheimer-Volkoff equations at zero and finite temperature, including scenarios with fixed entropy per baryon. Our original results at finite temperature open the path to a new description of proto-neutron stars.

    Comments:
    42 pages, 20 figures, 6 tables
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Theory (hep-th)
    arXiv:
    2602.06815 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE