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Nuclear Theory·nucl-th

Wednesday·July 31, 2024

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 01

    [Submitted on 30 Jul 2024]

    From Complexity to Clarity: Kolmogorov-Arnold Networks in Nuclear Binding Energy Prediction

    Hao Liu · Jin Lei · Zhongzhou Ren

    This study explores the application of Kolmogorov-Arnold Networks (KANs) in predicting nuclear binding energies, leveraging their ability to decompose complex multi-parameter systems into simpler univariate functions. By utilizing data from the Atomic Mass Evaluation (AME2020) and incorporating features such as atomic number, neutron number, and shell effects, KANs achieved a significant lower root mean square error (0.26~MeV), surpassing traditional models. The symbolic regression analysis yielded simplified analytical expressions for binding energies, aligning with classical models like the liquid drop model and the Bethe-Weizsäcker formula. These results highlight KANs' potential in enhancing the interpretability and understanding of nuclear phenomena, paving the way for future applications in nuclear physics and beyond.

    Comments:
    accepted by Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2407.20737 [pdf]
    PRC(2025)·11 citations
  2. 02

    [Submitted on 30 Jul 2024]

    Spin response of neutron matter in ab initio approach

    J. E. Sobczyk · W. Jiang · A. Roggero

    We propose a general method embedded in the ab initio nuclear framework to reconstruct linear response functions and calculate sum rules. Within our approach, based on the Gaussian integral transform, we consistently treat the groundstate and the excited spectrum. Crucially, the method allows for a robust uncertainty estimation of the spectral reconstruction. We showcase it for the spin response in neutron matter. Our calculations are performed using state-of-the-art many-body coupled-cluster method and Hamiltonians derived in the chiral effective field theory, emphasizing the analysis of finite-size effects. This work serves as a stepping stone towards further studies of neutrino interactions in astrophysical environments from first principles.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2407.20986 [pdf]
    PRL(2025)·8 citations
  3. 03

    [Submitted on 29 Jul 2024] (cross-list from hep-ph)

    The Proton Charge Radius from Dimuon Photoproduction off the Proton

    Yong-Hui Lin🇩🇪 · Feng-Kun Guo🇨🇳 · Ulf-G. Meißner🇩🇪

    We investigate the feasibility of measuring the proton charge radius through dimuon photoproduction off a proton target. Our findings indicate that the Bethe-Heitler mechanism, which dominates at small momentum transfers, allows for an extraction of the proton electromagnetic form factors in the extremely low region below GeV in the spacelike region, when the incident photon beam energy exceeds several hundred MeV. The optimal kinematical region and a sensitivity study of the proton charge radius from dimuon photoproduction are presented. Such a measurement is expected to provide an alternative to the elastic muon-proton scattering measurements such as MUSE at PSI and AMBER at CERN.

    Comments:
    6 pages, 5 figures. The version to be published in PLB
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2407.20375 [pdf]
    PLB(2024)·2 citations
  4. 04

    [Submitted on 30 Jul 2024] (cross-list from hep-ph)

    System size dependence of energy loss and correlations of heavy mesons at LHC energies

    Jiaxing Zhao🇫🇷 · Joerg Aichelin🇫🇷 · Pol Bernard Gossiaux🇫🇷 · Klaus Werner🇫🇷

    We study the system size dependence of heavy quark (HQ) observables at a center of mass energy of TeV to explore whether it can provide further constraints on the physical processes which are involved: energy loss of HQs in the quark gluon plasma (QGP), hadronization and hadronic rescattering. We use the EPOS4HQ approach to study p-p and 0-10\% central O-O, Ar-Ar, Kr-Kr and Pb-Pb reactions and investigate in detail the momentum change of heavy quarks from creation until their detection as part of a hadron as well as the enhancement of heavy baryon production at low . We investigate furthermore the origin and the system size dependence of the azimuthal correlations between the heavy quark and the heavy antiquark and how one can bypass the problem that correlations are washed out due to the combinatorial background. We conclude that a systematic study of the system size dependence of the momentum loss allows to separate the momentum loss due to the passage through the QGP from the momentum change due to hadronization and the correlations allow to gain inside into the different pQCD processes in which the heavy quarks are created.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2407.20919 [pdf]
    PRC(2025)·12 citations

Affiliations

first authorsco-authorsvia INSPIRE