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Nuclear Theory·nucl-th

Monday·April 27, 2026

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 01

    The parity-violating asymmetry including QED corrections in high-energy electron-nucleus collisions

    Xavier Roca-Maza🇪🇸 · D. H. Jakubassa-Amundsen🇩🇪

    The parity-violating asymmetry, accounting for the vector and axial-vector vertex plus self-energy correction as well as for vacuum polarization, is calculated nonperturbatively by solving the corresponding Dirac equation for the electronic scattering states. Investigating the nuclei Al, Ca and Pb at collision energies in the GeV region and at forward scattering angles matching the experimental geometries, it is found that the combined QED effects change the parity-violating asymmetry by less than one percent. The same is true for C and Pb at an energy of 150 MeV.

    nucl-thnucl-exEPL(2026)·0 citations
  2. 02

    Four-dimensional QCD equation of state from a quasi-parton model with physics-informed neural networks

    Fu-Peng Li🇨🇳 · Long-Gang Pang🇨🇳 · Guang-You Qin🇨🇳

    The equation of state (EoS) of strongly interacting matter at finite temperature and chemical potentials (baryon, charge, and strangeness) is a crucial input for hydrodynamic simulations of relativistic heavy-ion collisions. We construct a four-dimensional EoS using a deep-learning-assisted quasi-particle model (DLQPM) within a physics-informed neural network (PINN) framework, in which the masses of light quarks, strange quarks, and gluons are parameterized as functions of temperature and chemical potentials (). The model is constrained by lattice QCD data at vanishing chemical potentials and provides a thermodynamically consistent extrapolation to finite . The DLQPM accurately reproduces the lattice-calculated cumulants at , and its predicted EoS at various chemical potentials agrees well with results from the generalized -expansion method in lattice QCD. Furthermore, the calculated baryon-strangeness correlation is consistent, within uncertainties, with preliminary STAR data. This work offers a reliable EoS for exploring the QCD phase structure in the beam energy scan region.

    nucl-thhep-ph1 citation
  3. 03

    Fusion of light nuclei in a multicluster realization of the three-body problem

    Mikhail Egorov

    This work describes a few-body dynamics method based on the Faddeev integral equations in momentum space for determining the total cross sections of fusion and breakup reactions with two- and three-body final channels in the continuum, employing a cluster representation of the colliding nuclei. Total cross sections were obtained for the reactions , , , , , , , and , in which both the projectile and the target nucleus were treated in a cluster representation. The work also implements a two-potential method to determine the Coulomb matrix and to account for Coulomb effects in short-range dynamics in momentum space. Calculations of the initial-state Coulomb interaction were performed; furthermore, an estimate was obtained for the magnitude of the off-shell effect of the Coulomb matrix, as well as the magnitude of the atomic electron anti-screening effect on the Coulomb interaction of the colliding nuclei. The calculated contribution of the cluster mechanism to the total cross section of the considered fusion reactions in the kinetic energy range is in good agreement with known experimental data.

    nucl-thquant-ph0 citations
  4. 04

    The 0+-spectrum in rare earth nuclei within the pseudo-SU(3) shell model

    Peter O. Hess · Sahila Chopra

    The study of the structure of the 0+ spectrum in heavy nuclei has drawn much attention in the last two decades. In this contribution we study their properties from a microscopic point of view. The pseudo-SU(3) model (\tilde{SU}(3)) is applied to some rare earth nuclei, namely to Sm, Gd, Dy, Er, Yb and Hf isotopes. It is shown that the 0+ spectrum, and the accumulation of states at certain energies, can be well understood using this microscopic model, which takes into account the Pauli Exclusion Principle (PES). Intentionally, a very simple model Hamiltonian is applied and only the valence shell is taken into account, in order to high-lighten certain cross features. It is demonstrated that the microscopic Hilbert space is essential in understanding the accumulation of 0+-states. A discussion to other models is provided. Also the dominance of B(E2)-transitions from the {\gamma}-band over those from the \b{eta}-band turns out to be trivial, in contrast to within some collective models.

    nucl-thEPJA(2026)·0 citations
  5. 05

    Ab initio short-range nuclear matrix elements for neutrinoless double-beta decay

    A. Todd🇨🇦 · T. Shickele🇨🇦 · A. Belley🇨🇦 · L. Jokiniemi🇨🇦 · J. D. Holt🇨🇦

    We present converged ab initio calculations of short-range neutrinoless double-beta () decay nuclear matrix elements for the key experimental isotopes Ge, Se, Te and Xe. Starting from different nuclear forces derived from chiral effective field theory, we apply the in-medium similarity renormalization group to obtain an effective valence-space Hamiltonian along with consistently transformed -decay operators. We then obtain a range of values for the matrix elements that is consistent with, but generally smaller than, those from phenomenology. Finally, we combine our results with current limits from -decay searches to obtain constraints for the sterile-neutrino mixing-mass parameter space when considering the inclusion of a fourth sterile neutrino.

    nucl-thPRL(2026)·0 citations

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first authorsco-authorsvia INSPIRE