PaperPanorama
FAQ

Nuclear Theory·nucl-th

Thursday·March 13, 2025

6 papers—5 primary·1 cross-listed

All6Primary5Cross-lists1
  1. 01

    [Submitted on 12 Mar 2025]

    Advancing multimessenger approaches in heavy-ion collisions: Insights from electromagnetic probes

    Lipei Du🇺🇸

    Electromagnetic (EM) probes, including photons and dileptons, do not interact strongly after their production in heavy-ion collisions, allowing them to carry undistorted information from their points of origin. This makes them powerful tools for studying early-stage equilibration and the thermodynamic properties of the quark-gluon plasma (QGP). In these proceedings, we highlight recent theoretical advancements in EM probes, focusing on their role in probing early-stage dynamics and extracting medium properties. We also discuss the emerging multimessenger approach, which combines hadronic and electromagnetic probes to achieve a more comprehensive understanding of the QGP.

    Comments:
    8 pages, 4 figures. Invited plenary talk at Hard Probes 2024 (Nagasaki, Japan, Sep 22-27, 2024). Contribution to the proceedings
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2503.09045 [pdf]
    EPJ Web Conf.(2025)·3 citations
  2. 02

    [Submitted on 12 Mar 2025]

    Microscopic investigation of wobbling motion in even-even nuclei

    S. A. Bhat · S. Jehangir · G. H. Bhat · J. A. Sheikh · G. B. Vakil

    The possibility of observing wobbling mode in the even-even systems of 76Ge, 112Ru, 188,192Os, 192Pt and 232Th is explored using the triaxial projected shell model approach. These nuclei are known to have {\gamma}-bands whose odd-spin members are lower than the average of the neighbouring even-spin states. It is shown through a detailed analysis of the excitation energies and the electromagnetic transition probabilities that the observed band structures in these nuclei except for 232Th can be characterised as originating from the wobbling motion. It is further demonstrated that quasiparticle alignment is responsible for driving the systems to the wobbling mode.

    Comments:
    13 pages, 15 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2503.09204 [pdf]
    PRC(2025)·2 citations
  3. 03

    [Submitted on 12 Mar 2025]

    Fourier shape parametrization in covariant density functional theory for nuclear fission

    Zeyu Li · Yang Su · Lile Liu · Yongjing Chen · Zhipan Li

    We implement the Fourier shape parametrization within the point-coupling covariant density functional theory to construct the collective space, potential energy surface (PES), and mass tensor, which serve as inputs for the time-dependent generator coordinate method to simulate the fission dynamics. Taking \(^{226}\)Th as a benchmark, we demonstrate the superiority of Fourier shape parametrization over conventional spherical harmonic parametrization: it significantly enhances the convergence of higher-order collective shape parameters by efficiently characterizing extreme nuclear deformations. Consequently, the new framework generates more reasonable elongated configurations, particularly for the scission configurations, and significantly improves the description of charge distribution near the symmetric fission peak. Moreover, the Fourier shape parametrization provides a smooth and well-defined three-dimensional (3D) PES with minimal correlations between degrees of freedom, enabling high-precision 3D dynamical simulations of fission.

    Comments:
    7 figures, 9 pages
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2503.09308 [pdf]
    PLB(2025)·5 citations
  4. 04

    [Submitted on 12 Mar 2025]

    Exploratory study on the masses of odd- nuclei and -process simulation based on the deformed relativistic Hartree-Bogoliubov theory in continuum

    C. Pan · Y. C. Yang · X. F. Jiang · X. H. Wu

    Nuclear masses of exotic nuclei are important for both nuclear physics and astrophysics. The deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc) is capable of providing proper descriptions for exotic nuclei by simultaneously including deformation, pairing correlation and continuum effects, and a mass table of even- nuclei with has been developed based on the DRHBc theory. This work employs a methodology to estimate the masses of odd nuclei using neighboring even nuclei's masses and microscopic pairing gaps, and the performance of microscopic pairing gaps are validated by comparing with empirical ones. Combining the DRHBc masses of even- nuclei and the estimated masses of odd- nuclei, a pseudo DRHBc mass table is developed, with the root-mean-square (rms) deviation from available mass data MeV. Then this mass table is employed in the -process simulation; results show that the differences in the details of pairing gaps do not yield qualitative discrepancy in -process abundances, while the deformation effects can influence the -process path and thus affect the -process abundance. In particular, the nuclear shape transitions can even lead to the discontinuity of the -process path, suggesting that incorporating triaxiality or beyond-mean-field effects would be valuable for further improvement.

    Comments:
    17 pages, 12 figures
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    2503.09324 [pdf]
    EPJA(2025)·4 citations
  5. 05

    [Submitted on 12 Mar 2025]

    Impact of the Center of Mass Fluctuations on the Ground State Properties of Nuclei

    Matthew Kafker · Aurel Bulgac

    Ground state properties across the entire nuclear chart are described predominantly and rather accurately within the density functional theory (DFT). DFT however breaks many symmetries, among them the most important being the translational, rotational, and gauge symmetries. The translational symmetry breaking is special, since it is broken for all nuclei, unlike the rotational and gauge symmetries. The center-of-mass (CoM) correction most commonly used in the literature [see Vautherin and Brink, Phys. Rev. C {\bf 5}, 626 (1972) and Bender {\it et al.}, Rev. Mod. Phys. {\bf 75}, 121 (2003)] leads to a gain of 15,...,19 MeV, which varies rather weakly for medium and heavy mass nuclei. A better approximation to the CoM correction was suggested by Butler {\it et al.}, Nu cl. Phys. A {\bf 422}, 157 (1984) and its magnitude varies between 10 and 5 MeV from light to heavy nuclei, a correction which is also significantly larger than the RMS energy error in the Bethe-Weizsäcker mass formula, initially proposed by Gamow, Proc. Phys. Soc. A {\bf 126}, 157 (1930), which is at most 3.5 MeV, and which for heavy nuclei corresponds to about 0.2\% of their mass. ....

    Comments:
    17 pages, 3 figures, updated text and detailed arguments, one new figure
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2503.09470 [pdf]
    2 citations

Affiliations

first authorsco-authorsvia INSPIRE