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Nuclear Theory·nucl-th

Friday·April 25, 2025

11 papers—6 primary·5 cross-listed

All11Primary6Cross-lists5
  1. 01

    Inclusive Neutrino and Antineutrino Scattering on the C Nucleus Within the Coherent Density Fluctuation Model

    M. V. Ivanov🇧🇬 · A. N. Antonov🇧🇬

    We investigate quasielastic (anti)neutrino scattering on the C nucleus utilizing a novel scaling variable, . This variable is derived from the interacting relativistic Fermi gas model, which incorporates both scalar and vector interactions, leading to a relativistic effective mass for the interacting nucleons. For inclusive lepton scattering from nuclei, we develop a new scaling function, denoted as , based on the coherent density fluctuation model (CDFM). This model serves as a natural extension of the relativistic Fermi gas (RFG) model applicable to finite nuclei. In this study, we compute theoretical predictions and compare them with experimental data from Minera and T2K for inclusive (anti)neutrino cross-sections. The scaling function is derived within the CDFM framework, employing a relativistic effective mass of = 0.8 . The findings demonstrate a high degree of consistency with experimental data across all (anti)neutrino energy ranges.

    nucl-thUniverse(2025)·1 citation
  2. 02

    A physics-embedded Bayesian neural network for predicting the energy dependence of fission product yields with fine structures

    Jingde Chen · Yuta Mukobara · Kazuki Fujio · Satoshi Chiba · Tatsuya Katabuchi · Chikako Ishizuka

    We present a physics-embedded Bayesian neural network (PE-BNN) framework that integrates fission product yields (FPYs) with prior nuclear physics knowledge to predict energy-dependent FPY data with fine structure. By incorporating an energy-independent phenomenological shell factor as a single input feature, the PE-BNN captures both fine structures and global energy trends. The combination of this physics-informed input with hyperparameter optimization via the Watanabe-Akaike Information Criterion (WAIC) significantly enhances predictive performance. Our results demonstrate that the PE-BNN framework is well-suited for target observables with systematic features that can be embedded as model inputs, achieving close agreement with known shell effects and prompt neutron multiplicities.

    nucl-thnucl-exphysics.data-anPRC(2026)·0 citations
  3. 03

    Exploring the giant monopole resonance in superheavy nuclei: A theoretical perspective

    S. Kumar · Jeet Amrit Pattnaik · S. K. Singh · R. N. Panda · M. Bhuyan · S. K. Patra

    Within the relativistic mean field framework, in an extended Thomas-Fermi approximation, we calculate the binding energy and charge distribution radius for the latest superheavy nuclei, synthesised in various laboratories, with atomic numbers . The binding energy and radii are compared with the results obtained from relativistic Hartree calculations along with the experimental data, wherever available, to check the reliability of the methods. The calculations are extended to estimate the giant monopole resonances to understand the collective vibration of the nucleons for such superheavy nuclei. The giant monopole resonances obtained from scaling calculations are compared with the constraint computations. Furthermore, the results are compared with other known methods, such as the relativistic Random Phase Approximation (RPA) and time-dependent mean field calculations, along with some known lighter nuclei, specifically Zr isotopes (N = 42-86) and O isotopes (N = 10-36). Finally, the nuclear compressibility of the superheavy nuclei is predicted from the energy obtained in the breathing mode.

    nucl-thnucl-exPhys.Part.Nucl.Lett.(2026)·0 citations
  4. 04

    Directed and elliptic flow of light nuclei and hypernuclei in Au+Au collisions at GeV: Coalescence vs. Statistical Fragmentation

    Tom Reichert🇩🇪 · Manjunath Omana Kuttan🇩🇪 · Apiwit Kittiratpattana🇹🇭 · Nihal Buyukcizmeci🇹🇷 · Alexander Botvina🇩🇪 · Jan Steinheimer🇩🇪 · Marcus Bleicher🇩🇪

    The harmonic flow coefficients of light nuclei and hypernuclei in Au+Au collisions at GeV are investigated using the Ultra-relativistic Quantum Molecular Dynamics transport model. For the Equation-of-State we employ a density and momentum dependent potential from the Chiral-Mean-Field model. Light nuclei and hypernuclei production is described at kinetic freeze-out via a coalescence mechanism or with a statistical multi-fragmentation calculation. The directed flow of p, d, t, He, He as well as the , H and H is shown to approximately scale with mass number of the light cluster in both calculations. This is in agreement with the experimental results for the directed flow measured by STAR. Predictions for the directed and elliptic flow of (hyper)nuclei at further RHIC-FXT and FAIR energies show that the scaling properties should improve as the beam energy is increased.

    nucl-thnucl-exPRC(2025)·5 citations
  5. 05

    Study of QCD critical point with three-nucleon correlations in light nuclei yields ratios using PYTHIA8/Angantyr

    Zuman Zhang🇨🇳 · Ning Yu🇨🇳 · Sha Li🇨🇳 · Shuang Li🇨🇳 · Siyu Tang🇨🇳 · Meimei Zhang🇨🇳

    This study utilizes the PYTHIA8 Angantyr model to systematically investigate the effects of three nucleons correlation on the light nuclei yield ratio in Au+Au collisions at = 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV. The analysis explores this property across different rapidity ranges, collision centralities, and collision energies, while also examining the roles of multi-parton interactions (MPI) and color reconnection (CR) mechanisms. The results show that the light nuclei yield ratio remains stable with changes in rapidity coverage and collision centrality but slightly increases with rising collision energy. The impact of CR on the light nuclei yield ratio depends entirely on the presence of MPI; when MPI is turned off, CR has no effect. Additionally, the three-nucleon correlation, enhances the light nuclei yield ratio in both central and peripheral collisions. However, the non-monotonic energy dependence observed in experiments, the peak at = GeV reported by the STAR experiment, cannot be explained by the Angantyr model due to its lack of key mechanisms related to the quark-gluon plasma (QGP). Nevertheless, the Angantyr model serves as an important baseline for studying collision behaviors in the absence of QGP effects.

    nucl-thhep-thCPC(2025)·1 citation
  6. 06

    Exact solutions for the moments of the binary collision integral and its relation to the relaxation-time approximation in leading-order anisotropic fluid dynamics

    Etele Molnár🇵🇱

    We compute the moments of the nonlinear binary collision integral in the ultrarelativistic hard-sphere approximation for an arbitrary anisotropic distribution function in the local rest frame. This anisotropic distribution function has an angular asymmetry controlled by the parameter of anisotropy , such that in the limit of a vanishing anisotropy , approaches the spherically symmetric local equilibrium distribution function. The corresponding moments of the binary collision integral are obtained in terms of quadratic products of different moments of the anisotropic distribution function and couple to a well defined set of lower-order moments. To illustrate these results we compare the moments of the binary collision integral to the moments of the widely used relaxation-time approximation of Anderson and Witting in case of a spheroidal distribution function. We found that in an expanding system the nonlinear Boltzmann collision term leads to twice slower equilibration than the relaxation-time approximation. Furthermore we also show that including two dynamical moments helps to resolve the ambiguity which additional moment of the Boltzmann equation to choose to close the conservation laws.

    nucl-thhep-phphysics.flu-dynPRD(2025)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE