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Nuclear Theory·nucl-th

Thursday·November 20, 2025

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 07

    [Submitted on 19 Nov 2025] (cross-list from physics.atom-ph)

    Comprehensive Assessment of Properties for Nuclear Clock and Fundamental Physics Applications

    A. Chakraborty · B. K. Sahoo

    By employing singles, doubles, and triples excitations within the relativistic coupled-cluster framework, we perform comprehensive calculations of a wide range of atomic properties for the Th ion. These properties are essential for advancing nuclear clock technology and probing fundamental physics. Combining our isotope shift parameters with experimental data, we estimate highly accurate values of the differential nuclear charge radii for Th and Th. Additionally, we determine the nuclear magnetic dipole and electric quadrupole moments for both the ground and isomeric states of Th by combining measured hyperfine structure constants with our theoretical calculations. Our precise evaluations of electric dipole polarizabilities and hyperfine-induced quadrupole moments are critical for assessing systematic uncertainties in Th-based nuclear clock. Notably, we observe unexpectedly significant contributions from higher-order relativistic effects and excitations involving orbitals with higher angular momentum, which markedly influence the energies of the ground state and its fine-structure partner. These results highlight the substantial challenges in achieving highly accurate predictions for these properties.

    Comments:
    5 pages, 2 figures, 5 tables
    Subjects:
    Atomic Physics (physics.atom-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th); physics.chem-ph (physics.chem-ph)
    arXiv:
    2511.15346 [pdf]
    PRA(2026)·2 citations
  2. 08

    [Submitted on 19 Nov 2025] (cross-list from nucl-ex)

    First observation of deuteron-{\Lambda} correlations at RHIC

    STAR Collaboration

    Precise experimental information on hyperon-nucleon interactions is scarce but of paramount importance to our understanding of the inner structure of compact stars. In this letter, we report the first experimental results of correlation functions between deuterons (d) and {\Lambda} hyperons in Au+Au collisions at \sqrt{s_{NN} = 3.0 GeV measured by the STAR experiment at RHIC. A clear enhancement at small relative momenta has been observed in the correlation function. Through a Bayesian inference analysis, the source size parameters as a function of collision centrality and the spin- dependent strong interaction parameters (scattering length f0 and effective range d0) are extracted using the Lednický-Lyuboshitz formalism. The derived doublet spin state parameters (f0, d0) lead to a novel method to precisely determine {\Lambda} separation energy for the weakly bounded hypertriton ^{3}_{{\Lambda}}H.

    Comments:
    Main: 5 pages, 4 figures; Supplemental Note: 2 pages, 3 figures
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2511.15493 [pdf]
    PRL(2026)·9 citations
  3. 09

    [Submitted on 19 Nov 2025] (cross-list from hep-ph)

    Bridging the Gap: Connecting Atomic Nuclei to Their Quantum Foundations

    Fredrick Olness🇺🇸

    We extend the QCD Parton Model analysis by employing a factorized nuclear structure model that explicitly accounts for both individual nucleons and correlated nucleon pairs. This novel framework establishes a paradigm that directly links the nuclear physics description of matter (in terms of protons and neutrons) to the particle physics schema (in terms of quarks and gluons). Our analysis of high-energy data from lepton Deep-Inelastic Scattering, Drell-Yan, and W/Z production simultaneously extracts the universal effective distribution of quarks and gluons inside correlated nucleon pairs, and their nucleus-specific fractions. The successful extraction of these universal distributions marks a significant advance in our understanding of nuclear structure, as it directly connects nucleon-level and parton-level quantities.

    Comments:
    6 pages, 1 figures, 1 table. Talk presented at the 32nd International Workshop on Deep Inelastic Scattering and Related Subjects (DIS 2025), Capetown, South Africa, 24-28 March 2025. To appear in the proceedings
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2511.15659 [pdf]
    PoS(2025)·0 citations
  4. 10

    [Submitted on 19 Nov 2025] (cross-list from hep-ph)

    Resolving Ratio Redundancy in Chemical Freeze-out Studies with Principal Component Analysis and Bayesian Calibration

    Nachiketa Sarkar🇮🇳

    We introduce a Principal Component Analysis (PCA)--Bayesian framework for extracting chemical freeze-out conditions in relativistic heavy-ion collisions that resolves long-standing ambiguities in hadron-ratio--based analyses. By constructing all possible hadron-yield ratios from a chosen set of species and transforming them into an orthogonal PCA basis, the method removes linear redundancies and eliminates the information loss and systematic uncertainties associated with ratio selection. Energy-wise Bayesian calibration of the Hadron Resonance Gas (HRG) model is then performed directly in this decorrelated space, with a Gaussian Process emulator enabling fast and accurate model evaluations. A detailed Sobol sensitivity analysis, together with the PCA loading structure, identifies the most informative ratio combinations and reveals a transition from chemical-potential--dominated to temperature-controlled freeze-out with increasing . The calibrated model reproduces all measured ratios, and the extracted freeze-out parameters are consistent with previous HRG determinations.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2511.15707 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE