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Nuclear Theory·nucl-th

Monday·July 27, 2026

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 23 Jul 2026]

    Deformation, halo, and bubble structure: A paradigm shift of exotic phenomena in light to medium mass nuclei

    R. Barman · R. Chatterjee · W. Horiuchi · M. Kimura · G. Singh · Jagjit Singh · Shubhchintak

    The emergence of exotic nuclear structures, such as deformation, one- and two-neutron halos, and bubble configurations, marks a paradigm shift in our understanding of light- to medium-mass nuclei far from stability, particularly near and within the island of inversion extending across . In this review, we integrate microscopic structure calculations using the antisymmetrized molecular dynamics method with reaction theories such as the Glauber model for high-energy collisions, and highlight the use of the fully quantum mechanical finite-range distorted wave Born approximation for calculating both inclusive and exclusive Coulomb breakup observables for these medium mass systems. These theoretical frameworks enable precise probing of nuclear density profiles through observables such as total reaction cross sections, neutron removal cross sections, relative energy spectra, parallel momentum distributions, and angular distributions. Applications to several nuclei in the island of inversion reveal enhanced halo extensions, neutron-neutron correlations in Borromean nuclei, and central density depletions in bubbles, challenging traditional shell-model paradigms. Furthermore, the sensitivity of astrophysical reaction rates to these exotic inputs is explored, demonstrating their role in the refinement of r-process nucleosynthesis models and elemental abundance predictions. This unified approach not only bridges nuclear structure and reactions, but also highlights the driplines as frontiers for unraveling nuclear matter under extreme conditions, with implications for rare-isotope beam experiments and beyond.

    Comments:
    Review article, accepted for publication in "Progress in Particle and Nuclear Physics"
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2607.21730 [pdf]
    PPNP(2026)·0 citations
  2. 02

    [Submitted on 24 Jul 2026]

    Single-particle structure of the semi-magic nucleus Zr from a nonlocal dispersive optical model

    R. A. Ramon · M. C. Atkinson · W. H. Dickhoff

    A nonlocal dispersive-optical-model (DOM) analysis has been carried out for neutrons and protons in the semi-magic nucleus Zr. Elastic-scattering angular distributions, total and reaction cross sections, single-particle energies, the neutron and proton numbers, the charge distribution, and the binding energy have been fitted to extract the neutron and proton self-energies both above and below the Fermi energy. The resulting spectroscopic factors and other DOM ingredients yield a good description of the cross sections when the open-shell proton system is described with an extension of the DOM that treats pairing. The distinct difference between the open-shell proton system and a closed one is illustrated by the smooth transition from mostly full to mostly empty orbits.

    Comments:
    16 pages 13 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2607.21875 [pdf]
    0 citations
  3. 03

    [Submitted on 24 Jul 2026]

    Phaseless auxiliary-field quantum Monte Carlo in the Hartree-Fock-Bogoliubov manifold

    Zhaozhan Zhang

    We formulate and implement the phaseless auxiliary-field quantum Monte Carlo (AFQMC) method in the Hartree-Fock-Bogoliubov (HFB) manifold for systems with strong pairing correlations. Our formulation introduces a more flexible representation of HFB walkers with an explicit analytical expression for the normalization factor derived from the representation matrix with respect to the reference vacuum. We also extend our previously developed stochastic gauge formalism from the Slater determinant manifold to the HFB framework, providing additional flexibility for controlling stochastic fluctuations. Benchmark calculations for the Richardson model demonstrate the accuracy and numerical stability of the method.

    Comments:
    12 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2607.21929 [pdf]
    0 citations
  4. 04

    [Submitted on 24 Jul 2026]

    Nuclear incompressibility and fourth moment of the nuclear density in Skyrme functionals

    Soonchul Choi · Tae-Sun Park · Panagiota Papakonstantinou

    Recent experimental advances could soon allow the accurate extraction of not only the root-mean-square radius but also the fourth radial moment of the nuclear electric charge density distribution. The fourth radial moment of the nuclear density distribution, , provides a sensitive probe of the nuclear surface thickness, as it is more susceptible to the large- distributions than the root-mean-square radius (). In this work, we examine the utility of for constraining the nuclear equation of state (EoS) at subsaturation densities, specifically for the proton distribution and within the framework of Skyrme energy density functionals. Using a statistical analysis based on predictions from one hundred Skyrme functional models, we demonstrate strong correlations between the energy per particle curvature at and (or the ratio ) in representative nuclei such as and . We establish that , being sensitive to the density tail, serves as an efficient proxy for sub-saturation within the tested Skyrme functional space. Knowledge of within 0.5\% precision or better, for example in Ca or Pb, could constrain the curvature of the energy per particle of symmetric matter at fm within 20 MeV or less.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2607.22003 [pdf]
    NPA(2026)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE