PaperPanorama

Nuclear Theory·nucl-th

Monday·August 31, 2026

24 papers—7 primary·17 cross-listed

All24Primary7Cross-lists17
  1. 01

    Nuclear lattice effective field theory as a testing ground for -cluster structures in

    Gianluca Stellin · Serdar Elhatisari · Timo A. Lähde · Shihang Shen

    The framework of nuclear lattice effective field theory (NLEFT) is applied to , with the perspective of obtaining a model-independent density map of the geometry of a sample of excited states of the nucleus. The Hamiltonian incorporates Wigner SU(4)-symmetric nuclear forces as well as the Coulomb interaction. The coupling constants of the spin-isospin symmetric nucleon-nucleon potentials have been adjusted in order to reproduce the experimental ground-state (g.s.) energy of as well as the experimental Tjon ratio between the binding energies of and . The ensuing parameter set turns out to be capable of capturing the experimental trend of the binding energy per nucleon, reproducing simultaneously within 1% deviation the measured values for , , , , and . Considerations based on the convergence rate of Euclidean-time extrapolations for the two lowest energy eigenvalues highlight the dual nature of the and states, of hybrid mean-field and -cluster type. For the latter, triaxial -cluster configurations seem to be favoured over the axially-symmetric ones, whereas oblate superdeformation might characterize a rotational band at MeV excitation energy.

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  2. 02

    Microscopic Realization of Topologically Quantized Alignment in Fast-Rotating Nuclei

    Ganlong Ding · Sibo Wang · Hiroyuki Tajima · Daisuke Suzuki · Jing Peng · Haozhao Liang

    We present the first quantitative microscopic realization of topologically quantized alignment in a finite nuclear system. The realization is obtained by exact diagonalization of a cranking seniority model, with the first Chern number evaluated over the sphere of cranking-axis orientations and analyzed together with the orientation-averaged alignment and cranking-frame configuration probabilities. The Chern number changes in integer steps as the system evolves from initially paired configurations to increasingly aligned configurations. A new intermediate phase is found in which the Chern number is already nonzero while the alignment continues to evolve toward its quantized value. We show that this deviation originates from the competition among pairing, axial quadrupole splitting, and Coriolis mixing. Thus, our microscopic approach reveals a more nuanced emergence of topologically quantized alignment in realistic nuclei, providing a quantitative stepping stone toward experimental investigations.

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  3. 03

    Nuclear surface energy in a semiclassical Extended Thomas-Fermi approach with finite-range interactions

    D. Davesne · Y. Lallouet · A. Pastore · J. Navarro · X. Viñas

    Using the Gogny finite-range interaction, we investigate a series of semiclassical approximations to the Fock term entering the calculation of the nuclear surface energy. By comparing these approximations with the exact results obtained from the full Hartree-Fock solution in semi-infinite nuclear matter, we derive a simple pocket formula that can be incorporated into fitting protocols to estimate the surface energy coefficient with excellent accuracy.

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  4. 04

    The iconic U: ab initio nuclear structure theory towards the limit of the periodic table

    A. Scalesi · T. Duguet · V. Somà

    The ab initio description of heavy and superheavy nuclei constitutes one of the holy grails of nuclear theory, bearing on the synthesis of the heaviest elements and the limits of nuclear stability. Over the last fifteen years, many-body expansion methods, whose numerical cost scales polynomially with system size, have extended first-principles calculations to medium-mass nuclei and a few spherical closed-shell heavy systems. The largest portion of the nuclear chart is however composed of heavy deformed doubly open-shell nuclei and has remained completely out of reach. This is due to two major obstacles: (i) the huge computational cost of beyond mean-field calculations in very large single-particle bases, and (ii) a dubious collapse of the mean-field energy at large prolate deformation. While a highly efficient numerical implementation of the novel deformed self-consistent Green's function formalism removes the first difficulty, the second is cured by the inclusion of many-body correlations beyond the deformed mean field. Presenting the first ab initio calculation of the iconic U nucleus, this work brings the upper-end of the nuclear chart within reach of theoretical predictions based on first principles.

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  5. 05

    Hadronic rescattering effects on net-proton cumulants from functional renormalization group calculations

    Qianru Lin🇨🇳 · Shi Yin🇩🇪 · Jianing Li🇩🇪 · Hannah Elfner🇩🇪 · Fabian Rennecke🇩🇪 · Long-Gang Pang🇨🇳 · Jan M. Pawlowski🇩🇪

    Net-proton cumulants in the Beam Energy Scan region of heavy-ion collisions are widely used to probe critical fluctuations associated with the conjectured critical endpoint of Quantum Chromodynamics (QCD). Most existing studies, however, concentrate on the initial-state or phase-transition contributions, while the impact of hadronic rescattering on these observables has not been fully quantified. To address this gap, we construct event-by-event proton and antiproton distributions from functional renormalization group (fRG) cumulants using the maximum entropy principle, and propagate the resulting particles through the hadronic transport model SMASH in a simplified spherical evolution setup. We systematically investigate how the hadronic cascade modifies net-proton cumulants at collision energies , 3.9, 4.9, 7.2, and 7.7~GeV. In the canonical-ensemble framework, which enforces exact net-baryon number conservation, the higher-order cumulant signal---in particular the ratio at ~GeV---is strongly reduced during the early stage of the cascade; the suppression of reaches approximately . The non-monotonic energy dependence inherited from the fRG input survives the hadronic evolution, but its magnitude is substantially modified. These results demonstrate that hadronic rescattering provides a non-negligible background effect that must be accounted for when extracting QCD critical-point signals from experimental data.

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  6. 06

    Spin-State Teleportation and Tests of EPR Correlations Using 151 MeV Entangled Protons

    H. Witała

    We discuss the feasibility of quantum spin-state teleportation in a three-proton system at an energy of 151 MeV, where, similarly to the low-energy case, a single Bell-state term dominates the proton-proton scattering matrix. We find that, in contrast to the low-energy regime, where unpolarized proton-proton scattering produces strongly entangled outgoing proton pairs, at higher energies a pair of protons, each with an energy of ~MeV, must be produced in an unpolarized, exclusive proton-deuteron breakup reaction under complete final-state-interaction kinematics. The subsequent interaction of one of the entangled protons with a polarized hydrogen target triggers, as in the low-energy case, the teleportation process, whereby the polarization of the target proton is transferred to the second member of the entangled pair within the very narrow angular region of strong entanglement centered around a laboratory scattering angle of . We also find that scattering one member of a strongly correlated proton pair forming a Bell state from an unpolarized hydrogen target leads to Einstein-Podolsky-Rosen-like correlations between the polarization of the scattered proton and that of the unscattered second entangled proton. The polarization of the scattered proton varies with its scattering angle. An identical polarization, following the angular dependence of thepolarization of the first proton, is induced in the second member of the pair, whose initial polarization was zero and whose momentum remains unchanged. The sign of the polarization of the second proton is determined by the sign of the spin correlation in the Bell state.

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  7. 07

    Implications of relativistic corrections on high-momentum nucleon-transfer reactions

    W. L. Hai · D. Y. Pang · I. Tanihata · H. J. Ong · S. Terashima · X. Wang · Y.P. Xu · W.D. Chen · R.Y. Chen · J.J. Yan

    High-momentum components (HMCs) of nuclear wave functions, governed by short-range nucleon-nucleon correlations, provide essential insights into nuclear structure beyond the mean-field picture. High-energy (p, d) reactions offer access to these HMCs, but their theoretical treatment requires relativistic corrections when incident proton energies reach several hundred MeV. Although effects of relativistic kinematic corrections (RKCs) have been studied in several types of direct nuclear reactions, it has not been systematically studied in nucleon transfer reactions. Here, RKCs are incorporated into the adiabatic distorted wave approximation (ADWA) for (p, d) reactions by redefining particle masses in the zero-momentum frame. The approach is validated against proton elastic scattering data on 16O from 135 to 800 MeV using Dirac global optical model potentials, and then applied to (p,d) reactions on 12C, 16O, and 40Ca at incident energies from approximately 50 to 800 MeV. The RKCs yield neutron spectroscopic factors that are significantly more consistent across the entire energy range than those obtained from non-relativistic calculations, which systematically overestimate spectroscopic factors obtained at high incident energies. The present analysis demonstrates that relativistic kinematic corrections are of fundamental importance for the reliable extraction of spectroscopic factors and the accurate description of high-momentum nucleon-transfer reaction data.

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Affiliations

first authorsco-authorsvia INSPIRE