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Nuclear Theory·nucl-th

Tuesday·February 4, 2025

14 papers—6 primary·8 cross-listed

All14Primary6Cross-lists8
  1. 01

    [Submitted on 1 Feb 2025]

    Effect of a repulsive three-body interaction on the molecule

    Ya-Wen Pan🇨🇳 · Jun-Xu Lu🇨🇳 · Emiko Hiyama🇯🇵 · Li-Sheng Geng🇨🇳 · Atsushi Hosaka🇯🇵

    The hadronic molecular picture of the observed exotic states has inspired numerous investigations into few-body systems. Recently, the lattice effective field theory studied the effect of a three-body interaction on the binding energy of the system, revealing an intriguing phenomenon in the binding energy. This work uses the Gaussian expansion method to explore the underlying physics. Our results show that as the repulsive three-body interaction strengthens, the spatial size of the bound state gradually increases. Further enhancement of the three-body interaction causes the three-body bound state to break into a two-body bound state, accompanied by a distant meson. The identical nature of the two mesons leads to the fact that the system consistently resembles an isosceles triangle-shaped spatial configuration.

    Comments:
    8 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2502.00438 [pdf]
    PRD(2025)·6 citations
  2. 02

    [Submitted on 1 Feb 2025]

    Time Evolution of Prompt Gamma-Ray Emission in Cf(sf) and U(,f) Reactions

    Patrick Talou · Amy E. Lovell · Ionel Stetcu · Gencho Rusev · Toshihiko Kawano · Marian Jandel

    We investigate the time evolution of prompt fission emission due to the presence of ns to ms isomers in the fragments produced in the neutron-induced fission of U and in the spontaneous fission of Cf. Calculations performed with the CGMF fission event generator are compared with recent experimental data on Cf(sf) and U(,f) obtained with the DANCE+NEUANCE setup at the Los Alamos Neutron Science Center. Of particular interest are the average -ray energy spectrum as a function of time since scission, , the increase of the average -ray multiplicity over time, , and its evolution in time as a function of the fission fragment mass, . The time evolution of isomeric ratios in post-neutron emission fission fragments can be defined and used to test and reveal some deficiencies in our knowledge of the low-lying levels of neutron-rich nuclei produced in fission reactions.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2502.00599 [pdf]
    PRC(2025)·1 citation
  3. 03

    [Submitted on 2 Feb 2025]

    The nucleon structure from an AdS/QCD model in the Veneziano limit

    Jiali Deng (CCNU)🇨🇳 · Defu Hou (CCNU)🇨🇳

    We employ the VQCD model, a holographic approach that dynamically simulates essential QCD characteristics, including linear mass spectra, confinement, asymptotic freedom, and magnetic charge screening, while incorporating quark flavor effects. Using this model, we first calculate the proton mass spectrum and the wave function, incorporating anomalous dimensions to refine our results. Next, we compute the proton structure functions across a range of Bjorken values using consistent parameters. Furthermore, we derive the proton electromagnetic form factor by solving the electromagnetic field's motion equation, accounting for background effects, and demonstrate qualitative consistency with results from free electromagnetic fields coupled to fermions. Finally, we calculate the gravitational form factors by introducing an effective graviton mass arising from chiral symmetry breaking and the proton energy-momentum tensor. Our calculations yield results that are in excellent agreement with experimental data and lattice QCD computations, validating the VQCD model as a robust tool for studying proton properties.

    Comments:
    23 pages,1 table and 8 figures in Revtex
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2502.00771 [pdf]
    PRD(2025)·13 citations
  4. 04

    [Submitted on 2 Feb 2025]

    Kaon Modification in Pion Medium

    Yu. B. Ivanov🇷🇺

    Kaon properties in thermal pion-nucleon medium are studied. The dense pion-nucleon medium is produced in high-energy heavy-ion collisions. The consideration is based on the chiral nucleon-kaon-pion Lagrangian. It is found that the pion medium does not produce a substantive contribution but enhances the effect of the baryon matter. Numerical estimate shows that this enhancement factor induced by the pion medium does not exceed 5% at the freeze-out stage of heavy-ion collisions, i.e. it is small. However, the impact of this enhancement can be higher in actual nuclear collisions because the effect of the in-medium (anti)kaon modification is accumulated during the (anti)kaon evolution before the freeze-out when the pion density is higher.

    Comments:
    3 pages, 1 figure, references added, discussion extended, numerical error corrected
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2502.00819 [pdf]
    Phys.Part.Nucl.Lett.(2025)·0 citations
  5. 05

    [Submitted on 3 Feb 2025]

    Neutron-transfer induced breakup of the Borromean nucleus Be

    G. Villanueva · A. M. Moro · J. Casal · Jin Lei

    We address the problem of evaluating neutron-transfer induced breakup cross sections caused by the Borromean nucleus Be, using the reaction Au(Be,Be)Au as a test case. This reaction was recently measured over a wide range of incident energies around the Coulomb barrier. To deal with the high density of Au states that can be potentially populated in this reaction, we employ the Ichimura, Austern, Vicent model, in which the spectrum of physical states for this system is replaced by the solutions of a complex n+Au potential, accounting effectively for the fragmentation of single-particle states into physical states. Furthermore, to account for the unbound nature of the emitted Be system, we employ a three-body model of Be. The calculated stripping cross sections are found to be in good agreement with existing data over a wide range of incident energies. The importance of taking into account the energy spread of the single-particle strength of the outgoing Be and the target-like residual nucleus is discussed.

    Comments:
    7 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2502.01165 [pdf]
    PLB(2024)·7 citations
  6. 06

    [Submitted on 3 Feb 2025]

    Demystifying the fusion mechanism in heavy-ion collisions: A six-dimensional Langevin dissipative dynamics approach

    Yannen Jaganathen · Michał Kowal · Krzysztof Pomorski

    We present an in-depth investigation of heavy-ion fusion dynamics using a six-dimensional Langevin framework that enables unrestricted motion of the asymmetry parameter. The stochastic formalism naturally incorporates friction effects and energy fluctuations, providing a detailed understanding of the fusion process. The dynamics transition into the overdamped regime, facilitating rapid neck stabilization while effectively capturing the interplay between shape and rotational degrees of freedom. This approach achieves excellent agreement with experimental spin distributions and fusion cross-sections, establishing a robust foundation for forthcoming studies on the synthesis of superheavy elements and the exploration of the enigmatic fusion hindrance mechanism.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2502.01292 [pdf]
    PLB(2025)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE