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Nuclear Theory·nucl-th

Thursday·May 15, 2025

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    [Submitted on 13 May 2025]

    Symmetry properties of pair correlations in heavy deformed nuclei

    G. Palkanoglou · A. Gezerlis

    Nucleons are known to form pairing correlations with various types of spin-symmetries. Spin-singlet neutron-neutron and proton-proton pairing is abundant in the nuclear chart but spin-triplet and mixed-spin proton-neutron pairing correlations have also been predicted to form at least in the ground states of certain nuclei. A realistic candidate region is that of the lightest Lanthanides where it was recently demonstrated that the nuclear deformation expected to emerge enhances spin-triplet pairing correlations. In this paper we provide the details of the deformed multimodal Hartree-Fock-Bogolyubov theory that lead to this conclusion, as well as the details of the effects identified. We present in detail the response of different pairing correlations to various deformation modes and calculate their signatures in the odd-even staggering of masses. This paper provides a detailed discussion, and some resolutions, on the long-standing question ``what is the effect of nuclear deformation on the various pairing correlations?''

    Comments:
    17 pages, 14 figures; v2 includes feedback from the community
    Subjects:
    Nuclear Theory (nucl-th); Superconductivity (cond-mat.supr-con); Nuclear Experiment (nucl-ex)
    arXiv:
    2505.08879 [pdf]
    2 citations
  2. 02

    [Submitted on 14 May 2025]

    A renormalizable theory for not-so-light nuclei

    L. Contessi🇫🇷 · M. Schäfer🇨🇿 · A. Gnech🇺🇸 · A. Lovato🇺🇸 · U. van Kolck🇫🇷

    We present an improved action for Pionless Effective Field Theory (EFT). Previous formulations of renormalizable nuclear EFTs have encountered instabilities in systems with more than four nucleons. We resolve this issue by introducing a finite interaction range at leading order, which is compensated for in perturbation theory at next-to-leading order. Calculated ground-state energies of He, Li, C, and O converge and agree with experiment within theoretical uncertainties. This first successful implementation of systematic renormalizability beyond the lightest nuclei enables not only applications to larger nuclei but also extensions to other EFTs in the strong-coupling regime.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2505.09299 [pdf]
    7 citations
  3. 03

    [Submitted on 14 May 2025]

    Photonuclear Tomography in Ultraperipheral Heavy-Ion Collisions

    J.D. Baker🇺🇸 · C.A. Bertulani🇺🇸 · Victor P. Goncalves🇧🇷

    We present a theoretical investigation of photonuclear tomography as a novel technique for probing the internal structure of nuclei. In this approach, ultraperipheral heavy-ion collisions (UPCs) serve as a source of intense fluxes of virtual photons, which induce coherent production of vector mesons. By analyzing the probabilities and cross sections of these photon-induced processes, we propose a methodology for reconstructing the spatial distribution of nucleons within the nucleus. Our framework provides a systematic way to access information on the nuclear geometry probed in UPCs, offering new opportunities for studies of nuclear structure using particle production as a probe. Numerical calculations for selected examples illustrate the feasibility and potential of this method.

    Comments:
    10 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2505.09348 [pdf]
    PRC(2025)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE