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Nuclear Theory·nucl-th

Wednesday·October 23, 2024

13 papers—3 primary·10 cross-listed

All13Primary3Cross-lists10
  1. 01

    [Submitted on 22 Oct 2024]

    Quarkyonic matter with chiral symmetry restoration

    Bikai Gao🇯🇵 · Masayasu Harada🇯🇵

    We present a novel unified approach to describe the dense symmetric nuclear matter by combining the quarkyonic matter framework with the parity doublet model. This integration allows for a consistent treatment of the transition from hadronic to quark degrees of freedom while incorporating chiral symmetry restoration effects. Our model introduces a chiral invariant mass for both baryons and constituent quarks, enabling a smooth crossover between hadronic and quark matter in symmetric nuclear matter. We derive the equation of state (EOS) for this hybrid system and investigate its thermodynamic properties. The model predicts a gradual onset of quark degrees of freedom at high densities while maintaining aspects of confinement.

    Comments:
    comments are welcomed
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2410.16649 [pdf]
    PRD(2025)·17 citations
  2. 02

    [Submitted on 22 Oct 2024]

    Interactions of omega mesons in nuclear matter and with nuclei

    Horst Lenske🇩🇪

    In-medium interactions of omega-mesons in infinite nuclear matter and finite nuclei are investigated in a microscopic approach with nucleon-nucleon and nucleon-resonance particle-hole polarization modes. The nuclear polarization tensor formalism is used. Covariant mean-field self-energies are taken into account. Longitudinal and transversal self-energies are derived. The theoretical results are applied to finite nuclei in local density approximation. Applications to recent data on the in-medium width of omega mesons in 93-Nb are presented. The data are well described by self-energies containing S-wave and P-wave resonances. Low-energy parameters are determined. For the first time a spectrum of omega-nucleus bound states is obtained, albeit with reduced lifetimes.

    Comments:
    6 pages, 3 figures, Proceedings QNP 2024 Conference, Barcelona
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2410.16895 [pdf]
    PoS(2025)·1 citation
  3. 03

    [Submitted on 22 Oct 2024]

    Model for the Glauber-type calculations of beam fragmentation at low energies

    A. N. Ismailova · Yu. L. Parfenova · P. G. Sharov · D. M. Janseitov

    In the present paper momentum distributions of nuclei produced in the heavy ion beam fragmentation at the relatively low energies (below 100 MeV) are studied. For this study, a new theoretical approach is developed on the basis of the Glauber model modified for taking into account the energy and momentum conservation laws. In this approach, the longitudinal momentum of the most neutron rich nuclei, Be, Li, He, produced in a few neutron removal reactions in the B fragmentation in the Be target at a beam energy of 35 MeV are calculated. The region of applicability of the new approach is discussed. This approach gives the asymmetric longitudinal momentum distributions at low energies, and the asymmetry is defined by the kinematical locus and geometry of the reaction (central of peripheral reactions). We analyze the changes of the phase volume and the longitudinal momentum distributions with the beam energy and number of the removed nucleons. The results of the calculations are compared to the parametrizations widely used for estimates of nuclear production in fragmentation for planning of nuclear experiments.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2410.16962 [pdf]
    CPC(2025)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE