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Nuclear Theory·nucl-th

Tuesday·May 27, 2025

15 papers—7 primary·8 cross-listed

All15Primary7Cross-lists8
  1. 01

    [Submitted on 24 May 2025]

    Bridging reaction theory and nuclear structure in -Ca scattering

    Viacheslav Tsaran🇩🇪 · Francesco Marino🇩🇪 · Sonia Bacca🇩🇪 · Francesca Bonaiti🇺🇸 · Marc Vanderhaeghen🇩🇪

    We extend the pion-nucleus multiple-scattering framework to include detailed second-order rescattering dynamics for nuclei with non-zero isospin. To account for intermediate charge-exchange and nucleon spin-flip effects, we develop a scattering potential that depends on the one- and two-body densities of the target nucleus. We compute one-body densities from coupled-cluster theory and two-body densities within the Hartree-Fock approximation. To estimate theoretical uncertainties, we employ modern nuclear Hamiltonians derived from chiral effective field theory. While the sensitivity to nuclear structure details is mild, second-order corrections are found to be sizeable and essential for accurately reproducing differential cross sections measured in -Ca elastic scattering within the -resonance region

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2505.18459 [pdf]
    PRC(2025)·2 citations
  2. 02

    [Submitted on 24 May 2025]

    The Gilbert Damping Factor of Heavy Quark Spin Polarization in the Magnetic Field

    Tianyang Li🇨🇳 · Anping Huang🇨🇳 · Baoyi Chen🇨🇳

    We employ the linear response theory to calculate the polarization rate of heavy quark spin in the presence of a strong magnetic field and the hot QCD matter, both of which are simultaneously generated in relativistic heavy-ion collisions. The hot QCD medium is simplified as a fermionic system consisting of only quarks. The spin of heavy quarks can be polarized as a result of combined contributions from spin-spin interactions between quarks and spin-magnetic field interactions. This spin dynamics is modeled as consisting of a polarization term and a dissipation term, which is described by the Landau-Lifshitz-Gilbert (LLG) equation and widely studied in condensed matter physics, analogous to the momentum evolution in the Langevin equation. In this study, we calculate the Gilbert damping factor that characterizes the spin polarization rate of heavy quarks, considering a Coulomb potential between two fermions in the medium. The dependence of the heavy quark spin polarization rate on the strength of the magnetic field, the heavy quark mass, temperature, and baryon chemical potential is studied in detail. This analysis contributes to a better understanding of quark spin dynamics in the hot QCD medium and the magnetic field.

    Comments:
    12 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th); cond-mat.other (cond-mat.other)
    arXiv:
    2505.18767 [pdf]
    PRD(2026)·2 citations
  3. 03

    [Submitted on 24 May 2025]

    Constraints on maximum neutron star mass from proto-neutron star evolution

    Deepak Kumar🇮🇳 · Tuhin Malik🇵🇹 · Hiranmaya Mishra🇮🇳 · Constança Providência🇵🇹

    A proto-neutron star (PNS) gets formed after a successful supernova when the stellar remnant decouples from the ejecta. In this study, we explore a relativistic framework for the finite-temperature -equilibrium limit of equation of state (EOS), constrained via a Bayesian inference methodology. The EOS is constrained by minimal approximations on a few nuclear saturation properties, low-density pure neutron matter constraints from chiral effective field theory, and a neutron star (NS) maximum mass greater than 2.0 . Two sets of EOS derived from the relativistic mean field model for nucleonic and hyperonic matter constrained by a Bayesian inference calculation at the zero temperature limit are used. The thermal adiabatic index () is calculated as a function of the baryonic density across several temperatures for both the sets. Our results suggest that the maximum NS mass is of the order of 2.15 if hyperons are present. In addition, the present study suggests that an observation of NS with mass larger than can indirectly indicates the absence of hyperons in its core. The deleptonization of hyperonic PNS reduces the stellar maximum mass rendering the PNS exceeding the zero temperature maximum stellar (baryonic) mass limit becomes metastable which is prone to collapse into a black hole while PNS below such a mass threshold evolves to a stable NS.

    Comments:
    12 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2505.18888 [pdf]
    PRD(2025)·5 citations
  4. 04

    [Submitted on 25 May 2025]

    Microscopic constraints for the equation of state and structure of neutron stars: a Bayesian model mixing framework

    A. C. Semposki🇺🇸 · C. Drischler🇺🇸 · R. J. Furnstahl🇺🇸 · D. R. Phillips🇺🇸

    Bayesian model mixing (BMM) is a statistical technique that can combine constraints from different regions of an input space in a principled way. Here we extend our BMM framework for the equation of state (EOS) of strongly interacting matter from symmetric nuclear matter to asymmetric matter, specifically focusing on zero-temperature, charge-neutral, -equilibrated matter. We use Gaussian processes (GPs) to infer constraints on the neutron star matter EOS at intermediate densities from two different microscopic theories: chiral effective field theory (EFT) at baryon densities around nuclear saturation, , and perturbative QCD at asymptotically high baryon densities, . The uncertainties of the EFT and pQCD EOSs are obtained using the BUQEYE truncation error model. We demonstrate the flexibility of our framework through the use of two categories of GP kernels: conventional stationary kernels and a non-stationary changepoint kernel. We use the latter to explore potential constraints on the dense matter EOS by including exogenous data representing theory predictions and heavy-ion collision measurements at densities . We also use our EOSs to obtain neutron star mass-radius relations and their uncertainties. Our framework, whose implementation will be available through a GitHub repository, provides a prior distribution for the EOS that can be used in large-scale neutron-star inference frameworks.

    Comments:
    17 pages, 9 figures, 3 tables. Version now matches the published article
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2505.18921 [pdf]
    PRC(2026)·9 citations
  5. 05

    [Submitted on 26 May 2025]

    Triaxial shapes in even-even nuclei: A theoretical overview

    Dennis Bonatsos🇬🇷 · Andriana Martinou🇬🇷 · S.K. Peroulis🇬🇷 · D. Petrellis🇨🇿 · P. Vasileiou🇬🇷 · T.J. Mertzimekis🇬🇷 · N. Minkov🇧🇬

    Triaxial shapes in even-even nuclei have been considered since the early days of the nuclear collective model. Although many theoretical approaches have been used over the years for their description, no effort appears to have been made for grouping them together and identifying regions on the nuclear chart where the appearance of triaxiality might be favored. In addition, over the last few years, discussion has started on the appearance of small triaxiality in nuclei considered so far as purely axial rotors. In the present work we collect the predictions made by various theoretical approaches and show that pronounced triaxiality appears to be favored within specific stripes on the nuclear chart, with low triaxiality being present in the regions between these stripes, in agreement with parameter-free predictions made by the proxy-SU(3) approximation to the shell model, based on the Pauli principle and the short-range nature of the nucleon-nucleon interaction. The robustness of triaxiality within these stripes is supported by global calculations made in the framework of the Finite-Range Droplet Model (FRDM), which is based on completely different assumptions and possesses parameters fitted in order to reproduce fundamental nuclear properties.

    Comments:
    48 pages, 15 figures, 2 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2505.19753 [pdf]
    Atoms(2025)·6 citations
  6. 06

    [Submitted on 26 May 2025]

    Ab initio many-fermion structure calculations on a quantum computer

    Weijie Du🇨🇳 · Yangguang Yang🇨🇳 · Zixin Liu🇨🇳 · Chao Yang🇺🇸 · James P. Vary🇺🇸

    To overcome the limitations of existing algorithms for solving self-bound quantum many-body problems -- such as those encountered in nuclear and particle physics -- that access only a restricted subset of energy levels and provide limited structural information, we introduce and demonstrate a novel quantum-classical approach capable of resolving the complete bound-state spectrum. This method also provides the total angular momentum associated with each eigenstate. Our approach is based on expressing the Hamiltonian in second-quantized form within a novel input model combined with a scan scheme, enabling broad applicability to configuration-interaction calculations across diverse fields. We apply this hybrid method to compute, for the first time, the bound-state spectrum together with corresponding values of using a realistic strong-interaction Hamiltonian. Our approach applies to hadron spectra and values solved in the relativistic Basis Light-Front Quantization approach.

    Comments:
    8+5 pages with 4 figures and 3 tables
    Subjects:
    Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2505.19906 [pdf]
    PRC(2026)·3 citations
  7. 07

    [Submitted on 26 May 2025]

    Neutron Star Inner Crust at Finite Temperatures: A Comparison Between Compressible Liquid Drop and Extended Thomas-Fermi Approaches

    Guilherme Grams🇧🇪 · Nikolai N. Shchechilin🇧🇪 · Théau Diverrès🇫🇷 · Anthea F. Fantina🇫🇷 · Nicolas Chamel🇧🇪 · Francesca Gulminelli🇫🇷

    We investigate the effects of temperature on the properties of the inner crust of a non-accreting neutron star. To this aim, we employ two different treatments: the compressible liquid drop model (CLDM) and the temperature-dependent extended Thomas-Fermi (TETF) method. Our systematic comparison shows an agreement between the two methods on their predictions for the crust thermodynamic properties. We find that the CLDM description can also reproduce reasonably well the TETF composition especially if the surface energy is optimized on the ETF calculation. However, the neglect of neutron skin in CLDM leads to an overestimation of the proton radii.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2505.19984 [pdf]
    Universe(2025)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE