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Nuclear Theory·nucl-th

Friday·July 4, 2025

11 papers—7 primary·4 cross-listed

All11Primary7Cross-lists4
  1. 01

    [Submitted on 2 Jul 2025]

    Muon-induced fission as a probe of the underlying dynamics in nuclear fission

    Christian Ross · A.S. Umar

    Muon-induced fission could be utilized as a probe to study the underlying dynamics of nuclear fission. The probability of muon attachment to the light asymmetric fission fragment is sensitive to fission dynamics, such as the timescale and friction of the fission event, charge asymmetry, and possibly the shape of the fission fragments. We focus on muonic atoms that are formed with actinide nuclei. A relativistic approach is employed, solving the Dirac equation for the muonic wavefunction in the presence of a time-dependent electromagnetic field generated by the fissioning nucleus. Computations are carried out on a 3-D Cartesian lattice with no symmetry assumptions. The results show a strong dependence of the attachment probability on the fission charge asymmetry and a more modest dependence on friction.

    Comments:
    5 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2507.02191 [pdf]
    PRC(2025)·0 citations
  2. 02

    [Submitted on 2 Jul 2025]

    Quark-Gluon Plasma as a Quantum Channel: Entanglement, Decoherence, and Hadronization

    Fidele J. Twagirayezu🇺🇸

    We propose a quantum information framework to model the quark-gluon plasma (QGP) as a composite quantum channel acting on a multi-qubit or multi-qutrit color-entangled system. The QGP's effects are represented by amplitude damping (jet quenching), depolarizing noise (decoherence), and a thermal hadronization channel projecting onto color-singlet states. This construction captures energy loss, decoherence, and confinement dynamics in a unified open quantum system framework. We analyze the evolution of entanglement entropy and purity under this composite channel. Amplitude damping reduces entropy by driving subsystems toward pure states, while decoherence increases mixedness. Hadronization further modifies correlations via thermal projections weighted by hadron masses and freeze-out temperature (). Numerical simulations show monotonic entropy and purity loss, consistent with entanglement degradation and confinement. Our results support interpreting the QGP as a noisy quantum channel that progressively erases color entanglement. This framework bridges quantum information theory and QCD, offering new insights into hadronization and non-perturbative dynamics in heavy-ion collisions.

    Comments:
    10 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2507.02202 [pdf]
    3 citations
  3. 03

    [Submitted on 3 Jul 2025]

    Application of the microscopic optical potential of chiral effective field theory in astrophysical neutron-capture reactions

    Bing Wang · Dong Bai · Yi Xu

    A state-of-the-art microscopic global nucleon-nucleus optical potential has been developed by Whitehead, Lim, and Holt (WLH) within the framework of many-body perturbation theory, incorporating realistic nuclear interactions derived from chiral effective field theory. Given its potentially greater predictive power for reactions involving exotic isotopes, we apply it to the calculations of astrophysical neutron-capture reactions for the first time, which are particularly important to the nucleosynthesis of elements heavier than iron. It is found that this potential provides a good description of experimental known neutron-capture cross sections and Maxwellian-averaged cross sections. For unstable neutron-rich nuclei, we comprehensively calculate the neutron-capture reaction rates for all nuclei with , located between the valley of stability and the neutron drip line, using the backward-forward Monte Carlo method with the deviation as the estimator. The results reveal a noticeable separation in the uncertainty of rates around an isospin asymmetry of 0.28 under the constraint . This highlights the critical role of isospin dependence in optical potentials and suggests that future developments of the WLH potential may pay special attention to the isospin dependence.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2507.02418 [pdf]
    PLB(2026)·0 citations
  4. 04

    [Submitted on 3 Jul 2025]

    Extended momentum-dependent interaction for transport models and neutron stars

    Si-Pei Wang🇨🇳 · Lie-Wen Chen🇨🇳

    The momentum-dependent interaction (MDI) model, which has been widely used in microscopic transport models for heavy-ion collisions (HICs), is extended to include three different momentum-dependent terms and three zero-range density-dependent terms, dubbed as MDI3Y model. Compared to the MDI model, the single-nucleon potential in the MDI3Y model exhibits more flexible momentum-dependent behaviors. Furthermore, the inclusion of three zero-range density-dependent interactions follows the idea of Fermi momentum expansion, allowing more flexible variation for the largely uncertain high-density behaviors of nuclear matter equation of state (EOS), especially the symmetry energy. Moreover, we also obtain the corresponding Skyrme-like energy density functional through density matrix expansion of the finite-range exchange interactions. Based on the MDI3Y model, we construct four interactions with the same symmetry energy slope parameter MeV but different momentum dependence of , by fitting the empirical nucleon optical potential, the empirical properties of symmetric nuclear matter, the microscopic calculations of pure neutron matter EOS and the astrophysical constraints on neutron stars. In addition, two interactions with and MeV are also constructed for comparison. Using these MDI3Y interactions, we study the properties of nuclear matter and neutron stars. These MDI3Y interactions, especially those with non-monotonic momentum dependence of , will be potentially useful in transport model analyses of HICs data to extract nuclear matter EOS and the isospin splitting of nucleon effective masses.

    Comments:
    29 pages, 13 figures, 4 Tables. Title modified, presentation improved and discussions added. Accepted version to appear in PRC
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2507.02448 [pdf]
    PRC(2025)·4 citations
  5. 05

    [Submitted on 3 Jul 2025]

    Theoretical insights on nuclear double parton distributions

    Federico Alberto Ceccopieri🇫🇷 · Filippo Fornetti🇮🇹 · Emanuele Pace🇮🇹 · Matteo Rinaldi🇮🇹 · Giovanni Salmè🇮🇹 · Nicholas Iles🇮🇹

    In this paper, we address double parton scattering (DPS) in pA collisions. Within the Light-Front approach, we formally derive the two contributions to the nuclear double parton distribution (DPD), namely: DPS1, involving two partons from the same nucleon, and DPS2, where the two partons belong to different parent nucleons. We then generalize the sum rule for hadron DPDs to the nuclear case and analytically show how all contributions combine to give the expected results. In addition partial sum rules for the DPDs related to DPS1 and DPS2 mechanisms are discussed for the first time. The deuteron system is considered for the first calculation of the nuclear DPD by using a realistic wave function obtained from the very refined nucleon-nucleon AV18 potential, embedded in a rigorous Poincaré covariant formalism. Results are used to test sum rules and properly verify that DPS1 contribution compares with the DPS2 one, although smaller. We also introduce EMC-like ratios involving nuclear and free DPDs to address the potential role of DPS in understanding in depth the EMC effect.

    Comments:
    41 pages, 21 figures. Accepted version in EPJC
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2507.02495 [pdf]
    EPJC(2025)·2 citations
  6. 06

    [Submitted on 3 Jul 2025]

    Density dependent speed of sound and its consequences in neutron stars

    Suman Pal🇮🇳 · Gargi Chaudhuri🇮🇳

    We introduce a parametrized density-dependent speed of sound and construct an ensemble of equations of state for neutron stars which are found to closely resemble the realistic equations of state calculated using relativistic mean field theory. We show that each of these parameters display an unique feature relevant to the properties of the compact stars. The emergence of special points in the Mass-Radius plot is a significant outcome for neutron stars which is more commonly seen in case of hybrid stars. We have also shown that the curvature term in the speed of sound changes its sign for these hadronic equations of state without the matter reaching the conformal limit or undergoing any phase transition. It is related to the 1st derivative of the energy per nucleon reaching a maximum. We have also examined the detailed behavior of the trace anomaly and polytropic index for RMF models, as well as for a density-dependent parametrized speed of sound. Our analysis demonstrates that the sign of the trace anomaly at high densities is sensitive to the stiffness or softness of the EOS. Different observational constraints from mass-radius and tidal deformability can restrict the range of parameters in the proposed speed of sound model.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2507.02669 [pdf]
    PLB(2025)·2 citations
  7. 07

    [Submitted on 3 Jul 2025]

    Statistical shell model for neutrinoless double -decay nuclear transition matrix elements: Results for Ge, Se, Mo, Sn, Te and Xe

    V.K.B. Kota🇮🇳 · R. Sahu🇮🇳

    Statistical shell model (also called spectral distribution method or statistical spectroscopy method) based on random matrix theory and spherical shell model gives a theory for calculating neutrinoless double beta decay nuclear transition matrix elements (NDBD-NTME). This theory is briefly described and then applied to Ge, Se, Mo, Sn,Te and Xe NDBD-NTME. In these calculations, the Bethe's spin-cutoff factor and a bivariate correlation coefficient are varied in a range dictated by random matrix theory and trace propagation. The calculated NDBD-NTME are compared with the results from several other models as available in literature. The statistical shell model results are in general a factor 2 smaller compared to those from the spherical shell model.

    Comments:
    25 pages, 7 figures, 1 table
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2507.02707 [pdf]
    IJMPE(2026)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE