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Nuclear Theory·nucl-th

Monday·May 25, 2026

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    [Submitted on 22 May 2026]

    Intertwined quantum phase transitions in the even-even Sr isotopes

    Noam Gavrielov

    The even-even Sr isotopes are identified as a region of intertwined quantum phase transitions (IQPTs). In this scenario, a quantum phase transition involving the crossing of normal and intruder configurations is accompanied by a shape evolution within the intruder configuration. Using the interacting boson model with configuration mixing (IBM-CM), we show that the strontium chain exhibits coexisting Type I and Type II QPTs, where the intruder configuration evolves from a near-spherical structure in Sr to a deformed one in Sr, while the normal and intruder configurations cross between Sr and Sr. As a result, the ground state changes abruptly from a weakly collective normal configuration to a deformed intruder configuration. Evidence for this scenario is provided by a detailed comparison with experimental excitation energies, spectroscopic quadrupole moments, isotope shifts, and monopole transition strengths, together with the configuration and decompositions of the calculated wave functions. The results place the strontium isotopes alongside the neighboring zirconium chain as another realization of IQPTs in the intricate region.

    Comments:
    9 pages, 5 figures, 1 table
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2605.23352 [pdf]
    1 citation
  2. 02

    [Submitted on 22 May 2026]

    Quasiradial oscillations of rotating hybrid neutron stars

    Zi-Yue Zheng🇨🇳 · Ting-Ting Sun🇨🇳 · Huan Chen🇨🇳 · Xiao-Ping Zheng🇨🇳 · Jin-Biao Wei🇨🇳 · G. F. Burgio🇮🇹 · H.-J. Schulze🇮🇹

    We investigate fundamental quasiradial oscillations in slow-rotation approximation of pure and hybrid neutron stars, employing equations of state of nuclear matter from Brueckner-Hartree-Fock theory or the relativistic mean field model, and of quark matter from the Dyson-Schwinger quark model, performing a Gibbs construction for the mixed phase in hybrid stars. Characteristic differences between neutron-star and hybrid-star fundamental quasiradial oscillation frequencies during spin-down are pointed out.

    Comments:
    17 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2605.23433 [pdf]
    0 citations
  3. 03

    [Submitted on 22 May 2026]

    Coulomb bridge mechanism for peripheral polarization of weakly bound projectiles

    Hao Liu · Jin Lei · Zhongzhou Ren

    We identify the matrix elements that carry peripheral polarization of weakly bound projectiles through the Feshbach dynamical polarization potential (DPP) within the continuum-discretized coupled-channels (CDCC) framework. Splitting the two P-Q bridge couplings into nuclear and Coulomb parts, while keeping a single Q-space propagator common to every term, decomposes the DPP into a nuclear, a Coulomb, and an interference component, . Applied to Ni, LiPb, BeZn, and BZn, the decomposition reveals a controlled hierarchy: a nuclear bridge in the light system, a mixed bridge with strong destructive interference in the heavy stable case, and a Coulomb-dominated bridge in both halo systems, with the proton halo showing constructive nuclear-Coulomb interference. For the halo reactions, peripheral partial waves () satisfy , with the high- DPP tail dominated by . Two diagnostic calculations isolate the responsible matrix elements: removing the off-diagonal Coulomb propagation inside Q leaves the pattern essentially intact, whereas removing the Coulomb part of the P-Q bridge collapses both DPP-induced absorption and breakup. The peripheral polarization of halo reactions is therefore a Coulomb-bridge effect, and the high- elastic-breakup yield serves as its observable signature.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2605.23541 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE