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Nuclear Theory·nucl-th

Monday·November 3, 2025

13 papers—3 primary·10 cross-listed

All13Primary3Cross-lists10
  1. 01

    [Submitted on 31 Oct 2025]

    Double pole -matrix singularity in the continuum of Be

    David Cardona Ochoa🇫🇷 · Marek Płoszajczak🇫🇷 · Nicolas Michel🇨🇳 · Simin Wang🇨🇳

    The double pole singularity of the -matrix, the so-called exceptional point, associated with the doublet of resonances in the spectrum of Be has been identified in the framework of the Gamow shell model. The exceptional point singularity is demonstrated by the coalescence of wave functions and spectral functions of the two resonances, as well as by the singular behavior of spectroscopic factors and electromagnetic transitions.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2510.27293 [pdf]
    Acta Phys.Polon.Supp.(2026)·1 citation
  2. 02

    [Submitted on 31 Oct 2025]

    Semi-classical and boson descriptions of scissors states

    A. A. Raduta · C. M. Raduta · R. Poenaru · Al. H. Raduta

    A two interacting rotors Hamiltonian is alternatively treated semi-classically and by a Dyson boson expansion method. The linearized equations of motion lead to dispersion equation for the wobbling frequency. One defined a ground band with energies consisting in a rotational part and one half of the vibrational wobbling energy. Adding to each state energy the corresponding wobbling quanta one obtains the first excited band. Phonon amplitudes are used to calculate the reduced probability for the inter-band M1 transitions. The states exhibit a shears character. One points out a chiral symmetry which is broken by the interaction term, leading to a pair of twin chiral bands. Applications are made for Gd. One outlines the ability of the two rotor model to account for the wobbling and chiral motion in nuclei. Although the chosen trial function has not a definite total angular momentum, for two particular ansatz of the pairs the average value of the total angular momentum approximates, to a certain accuracy, the partial angular momentum In this context, the rotational bands defined throughout this present paper could be labeled by the total I.

    Comments:
    18 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2510.27510 [pdf]
    J.Phys.G(2025)·0 citations
  3. 03

    [Submitted on 31 Oct 2025]

    Holographic equation of state matched with hadron gas equation as a tool for the study of the quark-gluon plasma evolution

    A.V. Anufriev🇷🇺 · V.N. Kovalenko🇷🇺

    In this paper, we discuss the matching of the holographic equation of state with the equation of Hadron Resonance Gas for studying the nuclear matter properties within the framework of relativistic heavy-ion collisions. Machine learning methods are applied to the calibration of model's free parameters using the lattice QCD results for the physical values of quark masses. One of the most advanced procedures for matching is used with the function that approximate behavior of both models on particular limit adopted from NEOS equation. Final hadronic spectra are obtained within multi-staged numerical approach of the iEBE-MUSIC and SMASH-vHLLE packages. The code of relativistic hydrodynamics is modified by implementing a tabulated holographic equation of state, enabling simulations of quark-gluon plasma evolution with dynamically generated initial conditions via the 3D Monte Carlo Glauber Model and SMASH. Hybrid iSS+UrQMD and Hadron Sampler+SMASH approaches are utilized at the freeze-out stage.

    Comments:
    8 pages, 3 figures, part of materials from XXVIth International Baldin Seminar on High Energy Physics Problems "Relativistic Nuclear Physics and Quantum Chromodynamics"
    Subjects:
    Nuclear Theory (nucl-th); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2510.27541 [pdf]
    Theor.Math.Phys.(2026)·0 citations

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first authorsco-authorsvia INSPIRE