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Nuclear Theory·nucl-th

Monday·September 15, 2025

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    [Submitted on 12 Sept 2025]

    SU(3) rigid triaxiality in Sm

    Chunxiao Zhou · Xue Shang · Tao Wang

    The Sm nucleus, which has long been regarded as a typical quantum system exhibiting axial symmetry, has been recently suggested to exhibit a small degree of triaxiality by Otsuka \textit{et al.}. This small triaxiality was recently observed using the decay of the Sm isovector giant dipole resonance. Thus further studying this small triaxiality is very necessary for understanding the nature of the collectivity in nuclei. In this paper, the rigid triaxiality in Sm is investigated using the newly proposed SU3-IBM theory. If the irreducible representation (irrep) of the ground state is (18,2) in the SU(3) symmetry limit, the new model can effectively reproduce the experimental data of Sm, showing good agreements with realistic energy spectra, B(E2) values, and quadrupole moments. This result further confirms the vality of the SU3-IBM for the description of the rigid triaxiality in realistic nuclei, and reveals the SU(3) dominance of the collectivity motions in nuclei.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2509.10008 [pdf]
    2 citations
  2. 02

    [Submitted on 12 Sept 2025]

    Nuclear chiral density wave in neutron stars?

    Orestis Papadopoulos🇬🇧 · Andreas Schmitt🇬🇧

    Anisotropic phases potentially play a role in the internal composition of neutron stars, the main laboratory for the phase structure of QCD at high baryon densities. We review the study of such a phase, the chiral density wave, within a phenomenological nucleon-meson model, including nucleonic vacuum fluctuations within a renormalization scheme recently developed. Neutron stars in this model and within our approximations either do not contain a chiral density wave core or they are too light to agree with observations.

    Comments:
    12 pages, 4 figures, contribution to proceedings of XQCD 2025, July 2-4; v2: small modifications to the text, matches published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2509.10135 [pdf]
    J.Subatomic Part.Cosmol.(2025)·5 citations
  3. 03

    [Submitted on 12 Sept 2025]

    Effective Mass in Quantum Hadrodynamics-I and its Impact on the Equation of State of Neutron Matter

    Ghitha Nadhira Azka Rahiemy🇮🇩 · Eko Tri Sulistyani🇮🇩 · Pekik Nurwantoro🇮🇩

    The effective nucleon mass (M^*) plays a central role in Quantum Hadrodynamics-I (QHD-I), linking scalar meson interactions at the microscopic level to the macroscopic properties of dense nuclear matter. In this work, we re-derive the scalar density integral in detail and validate it numerically using Gaussian quadrature. The numerical and analytic results are found to be in excellent agreement, confirming the robustness of both approaches. We then investigate the sensitivity of M^* to different parameter sets, highlighting its strong influence on nuclear saturation, compressibility, and the resulting equation of state (EoS). The analysis shows that variations in meson-nucleon couplings propagate directly into differences in pressure and energy density, affecting the stiffness of the EoS. While QHD-I produces characteristically stiff EoS, the effective mass evaluation provides a transparent framework for connecting microscopic meson dynamics to macroscopic neutron star properties. These findings underline the relevance of M^* as a microscopic-macroscopic bridge and demonstrate the utility of numerical methods for extending relativistic mean-field models in nuclear astrophysics.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2509.10176 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE