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Nuclear Theory·nucl-th

Thursday·December 11, 2025

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 10 Dec 2025]

    Understanding Xe isotopes near through the prolate-oblate shape phase transition

    Wei Teng · Sheng-Nan Wang · Yu Zhang

    A simple algebraic scheme incorporating the prolate-oblate shape phase transition (SPT) is proposed within the framework of the interacting boson model to describe the quadrupole deformation features of Xe isotopes near . The analysis demonstrates that novel -soft modes, characterized by the unusual quadrupole moments and , can emerge near the critical point of this SPT. This finding is further applied to interpret the properties of low-lying states in the relevant Xe nuclei, particularly the experimentally observed nearly vanishing spectroscopic quadrupole moment , thereby offering new insights into the structure of a -soft deformed nucleus.

    Comments:
    10 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2512.09265 [pdf]
    PRC(2025)·4 citations
  2. 02

    [Submitted on 10 Dec 2025]

    Anomalous collective modes in atomic nuclei within the proton-neutron interacting boson model

    Wei Teng · Yu Zhang · Sheng-Nan Wang · Feng Pan · Chong Qi · J. P. Draayer

    Novel collective modes characterized by a ratio () less than 1.0 that were observed recently have been identified within the proton-neutron interacting boson model (IBM-2) using the consistent- Hamiltonian. These modes are shown to give rise to triaxial spectral features, including significant band mixing. The results provide a compelling explanation for the deeply suppressed ratio observed in W, Os, and Pt, offering new insights into the anomaly phenomenon in neutron-deficient nuclei.

    Comments:
    9 page, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2512.09272 [pdf]
    PLB(2025)·12 citations
  3. 03

    [Submitted on 10 Dec 2025]

    Determination of nuclear deformations with an emulator for sub-barrier fusion reactions

    Zehong Liao · K. Hagino · Long Zhu · S. Yoshida · K. Uzawa

    Based on the eigenvector continuation, which is mathematically an instance of the reduced basis method (RBM), we construct an emulator for coupled-channels calculations for heavy-ion fusion reactions at energies around the Coulomb barrier. We apply this to the O+Sm, W reactions and examine whether the emulator can be used to extract the deformation parameters of the target nuclei. We show that the emulator not only accelerates the calculations but also has an ability to accurately extract the nuclear shapes. This indicates that the emulator provides a powerful tool to systematically explore intrinsic shapes of atomic nuclei, enhancing our understanding of the fundamental properties of nuclear systems.

    Comments:
    13 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2512.09429 [pdf]
    PRC(2026)·1 citation
  4. 04

    [Submitted on 10 Dec 2025]

    Renormalizing Two-Neutron Halo Nuclei Without Neutron-Core Interaction

    Daniel Kromm · Matthias Göbel · Hans-Werner Hammer

    We consider the Effective Field Theory (EFT) scheme proposed by Hongo and Son (HS) to describe two-neutron halo nuclei where the neutron-core interaction is subleading. In this EFT, the ratio of the mean-square matter radius and charge radius is universal in so far that it only depends on the two-neutron separation energy of the nucleus and the neutron-neutron scattering length. By investigating the divergence structure of this theory, we find that one further renormalization condition is required to predict both radii separately. Our renormalization scheme uses one of the mean square radii or the scattering amplitude as input. We use the HS scheme to calculate the matter radii of the two-neutron halo nuclei \(^{11}\)Li, \(^{14}\)Be, \(^{17}\)B, \(^{19}\)B, and \(^{22}\)C and compare to the values obtained with standard Halo EFT. In this comparison we use both the physical value of the neutron-core scattering length and rescaled values. We observe good convergence against the HS scheme for the case of a negligible neutron-core interaction. Similar agreement for the radii is also found in the case of the halo nucleus \(^6\)He, where the \(nc\) interaction is in the p-wave. Our renormalization scheme makes the restriction in the ultraviolet cutoff range from the Landau pole explicit. We calculate the position of the Landau pole for various halo nuclei. In all cases the Landau pole restricts the cutoff to rather low values. Finally, we derive an explicit expression for the three-to-three neutron-neutron-core scattering amplitude and discuss its cut structure.

    Comments:
    27 pages, 7 figures, 4 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2512.09503 [pdf]
    J.Phys.G(2026)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE