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Nuclear Theory·nucl-th

Thursday·May 8, 2025

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    Parameterizations of Electron Scattering Form Factors for Elastic Scattering and Electro-Excitation of Nuclear States for and

    Arie Bodek · M. E. Christy · Zihao Lin · Giulia-Maria Bulugean · Amii Daniela Matamoros Delgado

    We report on empirical parameterizations of longitudinal () and transverse () nuclear electromagnetic form factors for elastic scattering and the excitations of nuclear states in and . The parameterizations are needed for the calculations of radiative corrections in measurements of electron scattering cross sections on and in the quasi-elastic, resonance and inelastic continuum regions, provide the contribution of nuclear excitations in investigations of the Coulomb Sum Rule, and test theoretical model predictions for excitation of nuclear states in electron and neutrino interactions on nuclear targets at low energies.

    nucl-thnucl-exPRC(2025)·0 citations
  2. 02

    Perturbation theory for a systematic account of the bound-state motion

    Alexander N. Kvinikhidze🇬🇪 · Hagop Sazdjian🇫🇷 · Boris Blankleider🇦🇺

    We derive a perturbation theory (PT) for the Lorentz boost operator in the space of two-nucleon wave functions. The latter is expressed in terms of the nucleon-nucleon () potentials, developed so far in great detail for their use in the scattering studies. The PT is designed to take into account the boost relativistic corrections in a systematic way and, as such, it is the only missing part in the corresponding approaches developed up to now in the low-energy effective field theories.

    nucl-thhep-phPRC(2025)·0 citations
  3. 03

    Heisenberg Uncertainty Inequality and Breaking of Isospin Symmetry in Atomic Nuclei

    Sandro Stringari🇮🇹

    The Heisenberg uncertainty inequality is used to derive a rigorous lower bound to the amount of isospin impurities in atomic nuclei, caused by the violation of isospin symmetry. The bound is fixed by the difference between the neutron and proton radii and the sum of the charge exchange monopole strengths. It can be used to check the consistency of advanced many-body calculations accounting for the breaking of isospin symmetry. The uncertainty inequality is also employed to derive an upper bound to the isovector dipole moment in terms of the amount of isospin impurities, providing an insightful connection between the violation of parity and isospin symmetries.

    nucl-thhep-exhep-thnucl-exPRResearch(2025)·0 citations
  4. 04

    Improved Dimensionality Reduction for Inverse Problems in Nuclear Fusion and High-Energy Astrophysics

    Jonathan Gorard🇺🇸 · Ammar Hakim🇺🇸 · Hong Qin🇺🇸 · Kyle Parfrey🇺🇸 · Shantenu Jha🇺🇸

    Many inverse problems in nuclear fusion and high-energy astrophysics research, such as the optimization of tokamak reactor geometries or the inference of black hole parameters from interferometric images, necessitate high-dimensional parameter scans and large ensembles of simulations to be performed. Such inverse problems typically involve large uncertainties, both in the measurement parameters being inverted and in the underlying physics models themselves. Monte Carlo sampling, when combined with modern non-linear dimensionality reduction techniques such as autoencoders and manifold learning, can be used to reduce the size of the parameter spaces considerably. However, there is no guarantee that the resulting combinations of parameters will be physically valid, or even mathematically consistent. In this position paper, we advocate adopting a hybrid approach that leverages our recent advances in the development of formal verification methods for numerical algorithms, with the goal of constructing parameter space restrictions with provable mathematical and physical correctness properties, whilst nevertheless respecting both experimental uncertainties and uncertainties in the underlying physical processes.

    ↳ cs.LGastro-ph.IMnucl-thphysics.comp-ph0 citations
  5. 05

    Rotation-tuned single hexagonal air cavity assisting in third-harmonic generation via hybrid modes

    Hao Song · Junmin Deng · Yu Chen · Yanming Sun · Ming-Chun Tang · Guo Ping Wang

    A fillable air cavity with a high quality (Q) factor and large-scale electric field confinement is highly desired in many optical applications. Yet, it remains challenging due to the dielectric transparency and metal loss in optical and near-infrared regimes. Here, we present a rotated hexagonal air cavity embedded in an Ag-air-Ag waveguide. Under near-infrared excitation, evanescent waves tunnel into the cavity. In addition to the whispering gallery mode and surface plasmon polaritons, the cavity also induces Fabry-Pérot (FP) resonance, whose orientation is tunable via cavity rotation. Thus, our cavity possesses much stronger field confinement and higher Q than a circular cavity lacking FP resonance. The waveguide exhibits suppressed backward reflection filtering and Fano-type lineshapes. Then, integrating a silicon cylinder into the cavity, we demonstrate linear tuning of Mie resonances via radius adjustment. When the electric dipole (ED) resonance is excited, energy is predominantly confined within the cylinder. Different Mie modes will change the orientation of the FP resonance. Furthermore, the hybrid modes with ED resonance induce the third-harmonic wave of green light. These findings offer a promising strategy for designing high-Q air cavities for next-generation multifunctional electro-optical devices.

    ↳ physics.opticsnucl-thAIP Adv.(2025)·0 citations
  6. 06

    Normal mode analysis within relativistic massive transport

    Xin Lin🇨🇳 · Qiu-Ze Sun🇨🇳 · Xin-Hui Wu🇨🇳 · Jin Hu🇨🇳

    In this paper, we address the normal mode analysis on the linearized Boltzmann equation for massive particles in the relaxation time approximation. One intriguing feature of massive transport is the coupling of the secular equations between the sound and heat channels. This coupling vanishes as the mass approaches zero. By utilizing the argument principle in complex analysis, we determine the existence condition for collective modes and find the onset transition behavior of collective modes previously observed in massless systems. We numerically determine the critical wavenumber for the existence of each mode under various values of the scaled mass. Within the range of scaled masses considered, the critical wavenumbers for the heat and shear channels decrease with increasing scaled mass, while that of the sound channel exhibits a non-monotonic dependence on the scaled mass. In addition, we analytically derive the dispersion relations for these collective modes in the long-wavelength limit. Notably, kinetic theory also incorporates collisionless dissipation effects, known as Landau damping. We find that the branch cut structure responsible for Landau damping differs significantly from the massless case: whereas the massless system features only two branch points, the massive system exhibits an infinite number of such points forming a continuous branch cut.

    ↳ hep-phcond-mat.stat-mechhep-thnucl-th+1PRD(2026)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE