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Nuclear Theory·nucl-th

Monday·November 17, 2025

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    [Submitted on 14 Nov 2025]

    Constraining Neutron Capture Cross Sections for with Gamma-ray Strength Function in Surrogate Reaction

    Shu-Tong Zhang · Wen Luo · Dan-Yang Pang · Zhi-Cai Li · Jing Feng · Bing JIang · Xin-Xiang Li · Yi Xu · Bao-Hua Sun

    We demonstrate to extract cross sections using the surrogate reaction with proper treatment of the spin-parity distribution of the compound nucleus . Experimental data of both -decay probability and -ray strength function are used to constrain the nuclear model parameters within a computational framework combining the Bayesian optimization and Markov chain Monte Carlo method, which helps to significantly reduce the data uncertainty. The cross sections are then extracted with a narrow uncertainty of 7.6\%-23.1\% within neutron energy range of 0.01 to 3.0 MeV for the first time, where no experimental data are available. Moreover, our method is verified with the reaction, of which the measured data are available for comparison. This work opens interesting perspectives on the matter of extracting () reaction cross sections on unstable nuclei as surrogate reaction experiments are becoming widely available.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2511.10955 [pdf]
    0 citations
  2. 02

    [Submitted on 14 Nov 2025]

    New constraints on equation of state of hot QCD matter

    Lu-Meng Liu🇨🇳 · Jinhui Chen🇨🇳 · Xu-Guang Huang🇨🇳 · Jiangyong Jia🇺🇸 · Chun Shen🇺🇸 · Chunjian Zhang🇨🇳

    The longitudinal structure of the quark-gluon plasma(QGP) remains a key challenge in heavy-ion physics. In this Letter, we propose a novel observable, event-by-event mean transverse momentum fluctuations Var, which is sensitive to the local pressure gradients and serves as a probe of longitudinal dynamics in the initial state of QGP. We demonstrate that the covariance of averaged transverse momentum at two rapidities and its associated decorrelation measures, and , exhibit strong sensitivity to the stiffness of equation of state (EoS) of QGP, while showing negligible dependence on the QGP transport coefficients. This distinctive behavior, revealed through state-of-the-art (3+1)-dimensional hydrodynamic simulations, establishes a powerful approach for constraining the EoS of QCD matter. In the meantime, our results provide new insights into the longitudinal structure of the QGP and its properties under high baryon density.

    Comments:
    9 Pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2511.11094 [pdf]
    5 citations
  3. 03

    [Submitted on 14 Nov 2025]

    NJL-Chiral Soliton and the Nucleon Equation of State at supra-saturation density: Impact of Chiral Symmetry Restoration

    Bikram Keshari Pradhan🇫🇷 · Guy Chanfray🇫🇷 · Hubert Hansen🇫🇷 · Jérôme Margueron🇫🇷

    It has been conjectured that, at sufficiently high baryon densities, the equation of state (EoS) of bulk nuclear matter can be identified with that of the nucleon core. In this work, we illustrate how the energy density and pressure distributions inside individual nucleons can be utilized to construct the EoS of supra-dense matter. In our framework, nucleons arise as topological solitons stabilized by vector mesons, which are dynamically generated through the path integral bosonization of an underlying Nambu-Jona-Lasinio (NJL) model. The restoration of chiral symmetry is implemented dynamically via a self-consistent, density-dependent scalar field, which modifies the (isovector) and (isoscalar) channels of the soliton. We analyze the resulting changes in soliton properties for different NJL parameter sets and demonstrate that the progressive restoration of chiral symmetry leads to a stiffening of the soliton-based EoS, making it compatible with existing neutron star EoSs. An EoS constructed from the solutions of the energy-density and pressure profiles at the center of the nucleon is also explored.

    Comments:
    28 pages, 24 figures, Data: https://github.com/bikramp-hub/NJL-Chiral-Soliton
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2511.11167 [pdf]
    EPJA(2026)·1 citation
  4. 04

    [Submitted on 14 Nov 2025]

    Low-energy enhancement in the magnetic dipole radiation of actinide nuclei

    C. Rodgers · D. DeMartini · Y. Alhassid

    We present the first theoretical results of the magnetic dipole (M1) -ray strength function (SF) for actinide nuclei within the shell-model Monte Carlo (SMMC) method. We observe a low-energy enhancement (LEE) in the M1 SFs of the six nuclei studied here, which serves as the first evidence, theoretical or experimental, that the LEE persists in the actinides. We also identify a scissors mode resonance in all six nuclei, which we compare with recent Oslo-method experiments.

    Comments:
    Updated version; main text: 7 pages, 3 figures, 2 tables; Supplemental Material: 2 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2511.11565 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE