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Nuclear Theory·nucl-th

Wednesday·October 29, 2025

15 papers—6 primary·9 cross-listed

All15Primary6Cross-lists9
  1. 01

    [Submitted on 27 Oct 2025]

    Microscopic study of the low-energy enhancement in the gamma-decay strength of \(^{50}\)V

    Jon Kristian Dahl · Ann-Cecilie Larsen · Noritaka Shimizu · Yutaka Utsuno

    We address the microscopic origin of the low-energy enhancement (LEE) in \(^{50}\)V with large-scale shell-model calculations to obtain and transitions within the same theoretical framework. The valence space spans the three major shells , and and is treated with the SDPFSDG-MU interaction using the KSHELL code. With a \(1 \hbar \omega\) truncation, 3600 energy eigenstates and a basis of positive and negative parity states, the calculations yield nearly two million individual dipole transitions. The fourteen lowest experimental levels are reproduced within ~MeV, the calculated total level density excellently reproduces Oslo-method data up to ~MeV, and the calculated dipole gamma strength function follows the experimental shape -- including the LEE -- for the full gamma-energy range covered by the Oslo experiment. The LEE is shown to be entirely magnetic dipole in origin. Both spin and orbital parts of the \(\hat{M}1\) operator are required to reproduce the LEE, with constructive interference between the spin and orbital parts giving an extra enhancement to the LEE. Reduced one-body transition densities identify proton transitions as the principal driver of the LEE.

    Comments:
    All raw data and analysis script at: https://doi.org/10.5281/zenodo.18403638
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2510.23779 [pdf]
    PRC(2026)·3 citations
  2. 02

    [Submitted on 27 Oct 2025]

    RHODIUM: A post-processor for BIGSTICK configuration-interaction wave functions

    Calvin W. Johnson

    RHODIUM is a postprocessing code for nuclear structure physics. It can be used to compute density matrices, spectroscopic amplitudes, and other information, from wave function and basis files created by the configuration-interaction shell-model code BIGSTICK. The source code is available at github.com/cwjsdsu/Rhodium. This manual gives detailed instructions how to use.

    Comments:
    Manual for RHODIUM code available on github
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2510.23787 [pdf]
    0 citations
  3. 03

    [Submitted on 28 Oct 2025]

    Multi-peak structure of meson spectral function in magnetic field

    Haoran Li🇨🇳 · Ziyue Wang🇨🇳

    We investigate the spectral functions of neutral and charged mesons in a hot dense medium under a external magnetic field using the two-flavor quark-meson model within the functional renormalization group (FRG) framework. Our results show that the spectral functions of {\sigma} and {\pi}0 mesons develop new structures due to decay channels into quarks occupying different Landau levels. By consistently incorporating the momentum relations at vertices for charged particles in a magnetic field, we further show that the {\pi}+ spectral function develops a multi-peak structure at finite temperatures, resulting from the various annihilation and decay channels available to {\pi}+ in the magnetic environment. This multi-peak structure is further enhanced in a finite-density medium, causing the {\pi}+ meson to become a broad resonance at lower temperatures and densities compared to neutral mesons. Such a multi-peak pattern is expected to be universal for charged mesons under magnetic fields and carries significant implications for understanding transport properties in magnetized strongly interacting fluids

    Comments:
    19 pages,25 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2510.23958 [pdf]
    0 citations
  4. 04

    [Submitted on 28 Oct 2025]

    Symmetry Energy of 2+1-flavor dense quark matter from perturbative QCD

    Isabella Danhoni🇺🇸 · Yumu Yang🇺🇸 · Mauricio Hippert🇧🇷 · Jacquelyn Noronha-Hostler🇺🇸

    The symmetry energy expansion was developed to connect isospin symmetric matter probed in nuclear experiments to asymmetric matter found in neutron stars. Using the isospin asymmetry derived from the Gell-Mann-Nishijima formula, we derive the symmetry energy expansion for quark matter that has unique properties compared to hadronic matter. To test our methods, we use perturbative Quantum Chromodynamics (pQCD) calculations at next-to-leading-order, where realistic quark masses can be included. We find that pQCD at electroweak equilibrium is not isospin symmetric but rather obtains a small skewness term in the symmetry energy expansion. We predict that if equations of state for nuclear matter must match pQCD results, then a non-monotonic dip in the symmetry energy would appear.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2510.23984 [pdf]
    PRC(2026)·9 citations
  5. 05

    [Submitted on 28 Oct 2025]

    Emergent Bell-Triplet State in Proton-Proton Scattering

    Z. X. Shen · H. Y. Shang · Y. G. Ma · D. Bai · S. M. Wang · Z. C. Xu · Y. Ayyad · C. Filgueira

    Entanglement is a key resource in quantum information science, yet its properties and applications in nuclear systems remain largely unexplored. Here, using proton-proton scattering as a quantum laboratory, we report the emergence of a near-pure Bell-triplet state at a laboratory energy of 151 MeV and a center-of-mass scattering angle of 90 degrees. In this unique kinematic regime, the scattering amplitude functions as a transition operator connecting distinct Bell states. Building upon this emergent resource, we propose a quantum teleportation protocol for proton spins, exploiting the intrinsic Hamiltonian of the strong interaction to perform the requisite Bell measurement. These findings effectively bridge few-body nuclear physics and quantum technology, establishing proton-proton scattering as both a source of high-fidelity entanglement and a natural processor for quantum information.

    Comments:
    In this revised version, we have corrected the author list by adding two co-authors who were unintentionally omitted in v2. We have also made minor revisions to the abstract for clarity
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex); Quantum Physics (quant-ph)
    arXiv:
    2510.24325 [pdf]
    7 citations
  6. 06

    [Submitted on 28 Oct 2025]

    Spectrum and electromagnetic properties of in the Geometric -cluster Model with symmetry at leading order

    Gianluca Stellin🇫🇷 · Karl-Heinz Speidel🇩🇪

    The relevance of the point-symmetry group for the prediction of spectrum and electromagnetic properties of the nucleus is discussed in the framework of the geometric -cluster model at leading order. The latter represents a macroscopic -cluster framework wherein nuclear excitations are described in terms of rotations and vibrations of clusters about their equilibrium positions, at the vertices of a square bipyramid. The finite group associated with the latter regulates the composition of the rotational bands as well as the transitions between the energy levels, by means of additional selection rules, of molecular nature. A sample of reduced electric multipole transition probabilities of intraband nature is provided.

    Comments:
    30 pages, 3 figures, 20 tables, proceedings for the 42th International Workshop on Nuclear Theory, 30 June - 4 July 2025, BAS & INRNE, (Borovec, Bulgaria)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2510.24522 [pdf]
    Nucl.Theor.(2025)·0 citations

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first authorsco-authorsvia INSPIRE