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Nuclear Theory·nucl-th

Thursday·June 19, 2025

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 01

    [Submitted on 18 Jun 2025]

    Manifestation of quark effects in nuclei via bremsstrahlung analysis in the proton-nucleus scattering

    Sergei P. Maydanyuk (1 and 2)🇨🇳 · K. Tsushima (3)🇧🇷 · G. Ramalho (4)🇰🇷 · Peng-Ming Zhang (5) ((1) Southern Center for Nuclear-Science Theory (SCNT), Institute of Modern Physics, Chinese Academy of Sciences, Huizhou, China, (2) Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, 03680, Ukraine, (3) Laboratório de Física Teórica e Computacional - LFTC, Programa de Pósgraduação em Astrofísica e Física Computacional, Universidade Cidade de São Paulo, 01506-000 São Paulo, São Paulo, Brazil, (4) Department of Physics and OMEG Institute, Soongsil University, Seoul, Republic of Korea, (5) School of Physics and Astronomy, Sun Yat-Sen University, Zhuhai, China)🇨🇳

    \textbf{Background} (1) The incoherent emission of photons is dominant comparing to coherent one in proton-nucleus scattering. The incoherent bremsstrahlung is very sensitive to the magnetic moments of nucleons in nuclei. (2) According to the quark-meson coupling (QMC) model, the nucleon magnetic moments in nuclei are enhanced relative to those in vacuum, originating from the quark structure of nucleons. \textbf{Purpose} Investigate possibilities of observing quark effects in nuclei by the analysis of bremsstrahlung in nuclear reactions. \textbf{Methods} Analyse the bremsstrahlung cross sections with established model in proton-nucleus scattering, by extending with inclusion of in-medium modified nucleon magnetic moments in nuclei by the QMC model. \textbf{Results} (1) After calibrating the model without the quark effects for experimental data (TAPS Collaboration data for ), we calculate the cross sections and observe the slight difference between the spectra for models with and without quark effects. Such result is found for the first time, confirming possibilities of observing the quark effects in the spectra of bremsstrahlung. (2) As found, quark effects are not enough to be observed in middle and heavy nuclei, as they have dominant incoherent contributions. (3) \isotope[18]{C} has minimal incoherent contribution concerning other carbon isotopes, where the quark effects should be minimal. In ratios between the spectra for \isotope[18]{C} and \isotope[12]{C} with and without the quark effects the difference is clearly observed. \textbf{Conclusions} We establish the new physical observable for the quark effects in nuclei in the bremsstrahlung accompanied in the nuclear reactions, which can be measured. The present suggestion is for the first time in both theoretically and experimentally to study the quark effects in nuclei via the bremsstrahlung.

    Comments:
    6 pages, 6 figures, Supplementary Material
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2506.15254 [pdf]
    PLB(2026)·2 citations
  2. 02

    [Submitted on 18 Jun 2025]

    Photoabsorption Cross Sections studied within the axially deformed Relativistic Quasiparticle Finite Amplitude Framework

    C. Chen (1 and 2) · Y. F. Niu (1 and 2) · R. Xu (3) · Y. Tian (3) ((1) Frontiers Science Center for Rare isotope, Lanzhou University, Lanzhou, China, (2) School of Nuclear Science and Technology, Lanzhou University, Lanzhou, China, (3) China Nuclear Data Center, China Institute of Atomic Energy, Beijing, China)

    Photoabsorption cross sections for 235 stable nuclei, ranging from Ca to Bi, were investigated by the quasiparticle finite amplitude method (QFAM) based on the axially deformed relativistic Hartree-Bogoliubov (RHB) approach using relativistic point-coupling interaction DD-PC1, with extensions to odd-A nuclei. GDR parameters based on the standard Lorentzian (SLO) model were extracted from QFAM results and compared with those from experimental data recommended by IAEA. Good agreement was achieved for giant dipole resonance (GDR) peak energies, while resonance widths were underestimated and hence peak cross sections were overestimated due to the lack of higher-order many-body correlations. These discrepancies were much improved in deformed nuclei. The effects of deformation on photoabsorption cross sections were examined systematically. The comparison of photoabsorption cross sections among QFAM results and discrepant experimental data revealed the potential of QFAM calculations in the evaluation of photonuclear data.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2506.15297 [pdf]
    0 citations
  3. 03

    [Submitted on 18 Jun 2025]

    Naive parton picture for kaon color transparency in

    Kook-Jin Kong🇰🇷 · Tae Keun Choi🇰🇷 · Byung-Geel Yu🇰🇷

    Nuclear transparency in the electronuclear reaction is investigated in parallel with our previous study of pion transparency in Phys.\ Rev.\ C {\bf 111}, 064608 (2025). Based on an extended Glauber framework that incorporates shadowing from the initial-state two-step process, kaon color transparency (CT) is analyzed to show that the steeper dependence observed for kaon CT, compared with the pion case, is more naturally described by the naive parton model (NPM) than by the quantum diffusion model (QDM). The inclusion of initial-state shadowing further reduces the transparency and improves the agreement with the experimental data. The and dependences of the kaon transparency are presented up to ~GeV, together with the corresponding and the supplementary ratio , for comparison with the Jefferson Lab (JLab) data obtained with the 6-GeV electron beam on C, Cu, and Au nuclei.

    Comments:
    6 pages, 5 figures, 1 table
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2506.15331 [pdf]
    CPC(2026)·2 citations
  4. 04

    [Submitted on 18 Jun 2025]

    Towards a microscopic description of nucleus-nucleus collisions

    Matteo Vorabbi · Michael Gennari · Paolo Finelli · Carlotta Giusti · Petr Navrátil

    We present the first results of a comprehensive microscopic approach to describe nucleus-nucleus elastic collisions by means of an optical potential derived at first order in multiple-scattering theory and computed by folding the projectile and target nuclear densities with the nucleon-nucleon matrix, which describes the interaction between each nucleon of the projectile and each nucleon of the target. Chiral interactions are consistently used in the calculation of the matrix and of the nonlocal nuclear densities, which are computed within the ab initio no-core shell model. Cross sections calculated for collisions on C and O at projectile energies in the range 100-300 MeV are presented and compared with available data. For momentum transfer up to about fm our results are in good agreement with the experimental data, whereas for higher momenta a reduction of the imaginary contributions is needed.

    Comments:
    PRL accepted version: 11 pages, 6 figures, and Supplemental material included
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2506.15406 [pdf]
    PRL(2025)·4 citations
  5. 05

    [Submitted on 18 Jun 2025]

    Extended multiconfigurational dynamical symmetry

    H. G. Ganev

    An extended multiconfigurational dynamical symmetry (EMUSY) within the symplectic symmetry approach to clustering (SSAC) is proposed for the general case of multicluster nuclear systems. A characteristic property of the EMUSY is that it includes more general symplectic, i.e. number non-preserving, transformations which contain the standard number-preserving (unitary) multiconfigurational dynamical symmetry transformations as a special limiting case. In this way the EMUSY becomes able to connect various possible clusterizations of different multicluster type, as well as various many-particle configurations between the shell, collective and cluster models of nuclear structure. The theory is briefly illustrated using the nuclear system Mg as an example.

    Comments:
    7 pages, 1 table
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2506.15590 [pdf]
    PRC(2026)·0 citations

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