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Nuclear Theory·nucl-th

Wednesday·July 16, 2025

15 papers—6 primary·9 cross-listed

All15Primary6Cross-lists9
  1. 01

    [Submitted on 14 Jul 2025]

    Polarized Electron Scattering from Light Nuclei at High Energies

    Minh Truong Vo🇻🇳 · Vu Dong Tran🇻🇳 · Quang Hung Nguyen🇻🇳

    We present a theoretical approach to investigate the scattering of polarized electrons from light nuclei using the multipole expansion for the scattering cross section within the framework of the unified electroweak theory. Scattering processes corresponding to different electron polarizations are analyzed and compared with the unpolarized electron scattering investigated earlier. Besides, the contribution of both polarized and unpolarized terms to the scattering cross section is examined. Numerical calculations for stable Li and unstable Be nuclei using the Weinberg-Salam model show that the longitudinal polarization and weak interaction are not explicitly correlated when electrons scatter at across all energy scales. A strong correlation emerges at the other scattering angles when the electron energy exceeds 10 GeV. This study provides additional information about nuclear structure and uncovers the role of electron polarization and its correlation with the weak interaction in each process, thus offering a more complete picture of electron-nucleus scattering.

    Comments:
    09 pages, 03 figures, 02 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2507.10633 [pdf]
    NPA(2026)·0 citations
  2. 02

    [Submitted on 14 Jul 2025]

    Ideal Boson Particle-Antiparticle System at Finite Temperatures

    D. Anchishkin🇺🇦 · V. Gnatovskyy🇺🇦 · I. Kondakova🇺🇦

    The thermodynamic properties of an ideal bosonic system composed of particles and antiparticles at finite temperatures are examined within the framework of a scalar field model. It is assumed that particle-antiparticle pair creation occurs; however, the system is simultaneously subject to exact charge (isospin) conservation. To implement this constraint, we first consider the system within the Grand Canonical Ensemble and then transform to the Canonical Ensemble using a Legendre transformation. This procedure provides a formally consistent scheme for incorporating the chemical potential at the microscopic level into the Canonical Ensemble framework. To enforce exact conservation of charge (isospin, N_I), we further analyze the thermodynamic properties of the system within the extended Canonical Ensemble, in which the chemical potential becomes a thermodynamic function of the temperature and conserved charge. It is shown that as the temperature decreases, the system undergoes a second-order phase transition to a Bose-Einstein condensate at the critical temperature T_c, but only when the conserved charge is finite, N_I=const \ne 0. In a particle-antiparticle system, the condensate forms exclusively in the component with the dominant particle number density, which determines the excess charge. We demonstrate that the symmetry breaking of the ground state at T=0 results from a first-order phase transition associated with the formation of a Bose-Einstein condensate. Although the transition involves symmetry breaking, it is not spontaneous in the strict field-theoretic sense, but is instead induced by the external injection of particles. Potential experimental signals of Bose-Einstein condensation of pions produced in high-energy nuclear collisions are briefly discussed.

    Comments:
    33 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Quantum Physics (quant-ph)
    arXiv:
    2507.10752 [pdf]
    J.Phys.G(2025)·0 citations
  3. 03

    [Submitted on 15 Jul 2025]

    Nucleus-nucleus potentials in the scattering of tightly and weakly bound systems

    J. Rangel🇲🇽 · B. Pinheiro🇧🇷 · V.A.B. Zagatto🇧🇷 · J. Lubian🇧🇷 · F.M. Nunes🇺🇸 · L.F. Canto🇧🇷

    \begin{description} \item[Background] Fusion reactions play an important role in nucleosynthesis and in applications to society. Yet they remain challenging to model. \item[Purpose] In this work, we investigate the features of the nucleus-nucleus potentials that describe fusion cross sections and compare with those needed for realistic calculations of elastic scattering and other direct-reaction cross sections. \item[Method] We perform coupled-channel calculations for studying elastic and fusion reactions around the Coulomb barrier with a tightly bound projectile (O+Sm). We also perform Continuum Discretized Coupled Channel calculations to study elastic (B+Ni) and fusion (Li+Pt) of loosely bound projectiles in the same energy regime. \item[Results] We contrast the coupled-channel results with those obtained in a single-channel solution with different assumptions for polarization potentials to shed light on the relevant absorption terms required for the two different reaction channels. \item[Conclusions] Our results suggest that different approximations may be required for modeling direct processes and for modeling fusion reactions. \end{description}

    Comments:
    17 pagaes, 10 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2507.11050 [pdf]
    PRC(2026)·3 citations
  4. 04

    [Submitted on 15 Jul 2025]

    Giant Dipole Resonance and Related Spin-dependent Excitations

    E.B. Balbutsev · I.V. Molodtsova

    The time-dependent Hartree-Fock equation is solved by the Wigner Function Moments method taking into account spin degrees of freedom. Energies and reduced transition probabilities of , and excitations are calculated taking Dy as an example. The spin degrees of freedom give rise to the electric Spin Dipole Resonance. Its properties and interplay with the Giant Dipole Resonance are investigated. The deformation-induced splitting of the spin resonance is discussed. The results of calculations are compared with the experimental data and other theoretical studies.

    Comments:
    23 pages, 6 figures, 8 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2507.11369 [pdf]
    0 citations
  5. 05

    [Submitted on 15 Jul 2025]

    Tidal deformability and compactness of neutron stars and massive pulsars from semi-microscopic equations of state

    W. M. Seif🇪🇬 · A. S. Hashem🇪🇬

    Tidal deformability measures how NS can comfortably deform as a response to an applied tidal field. We use updated constraints on the mass, radius, and tidal deformability of neutron star (NS) objects and pulsars to examine nuclear equations of state (EOS) based on realistic finite-range M3Y nucleon-nucleon interaction, which have been successfully used to describe low- and high-dense nuclear matter (NM). We then employ these EOSs to examine the impact of tidal deformability and compactness of NSs on their structure. We found that the EOSs from CDM3Y-230 to CDM3Y-330 characterized with the saturation incompressibility MeV together yield more limited ranges of tidal deformability and radius for NS objects than their experimentally inferred ranges. For light NS (), both and decreases upon decreasing the NS mass, which enhances its tidal deformability. The stiffness of the NS core matter has shown a minor effect on the tidal deformability of such NS (). An opposite behavior is obtained as an increase in the tidal Love number but a decrease in the more effective compactness of NS (), upon increasing (decreasing) the stiffness of the employed EOS (its mass). This appears as enhanced tidal deformability indicated at a larger radius for NS of stiffer NM and for the lighter NS above . Unified description of some correlations between tidal deformability, tidal Love number, and NS compactness is provided independent of the details of the considered EOS.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2507.11379 [pdf]
    Annals Phys.(2026)·1 citation
  6. 06

    [Submitted on 15 Jul 2025]

    Bayesian Model Selection and Uncertainty Propagation for Beam Energy Scan Heavy-Ion Collisions

    Syed Afrid Jahan🇺🇸 · Hendrik Roch🇺🇸 · Chun Shen🇺🇸

    We apply the Bayesian model selection method (based on the Bayes factor) to optimize -dependence in the phenomenological parameters of the (3+1)-dimensional hybrid framework for describing relativistic heavy-ion collisions within the Beam Energy Scan program at the Relativistic Heavy-Ion Collider. The effects of various experimental measurements on the posterior distribution are investigated. We also make model predictions for longitudinal flow decorrelation, rapidity-dependent anisotropic flow and identified particle in Au+Au collisions, as well as anisotropic flow coefficients in small systems. Systematic uncertainties in the model predictions are estimated using the variance of the simulation results with a few parameter sets sampled from the posterior distributions.

    Comments:
    27 pages, 22 figures, published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2507.11394 [pdf]
    PRC(2026)·14 citations

Affiliations

first authorsco-authorsvia INSPIRE