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Nuclear Theory·nucl-th

Thursday·September 19, 2024

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    Optimization of Nuclear Mass Models Using Algorithms and Neural Networks

    Jin Li · Hang Yang

    Taking into account nucleon-nucleon gravitational interaction, higher-order terms of symmetry energy, pairing interaction, and neural network corrections, a new BW4 mass model has been developed, which more accurately reflects the contributions of various terms to the binding energy. A novel hybrid algorithm and neural network correction method has been implemented to optimize the discrepancy between theoretical and experimental results, significantly improving the model's binding energy predictions (reduced to around 350 keV). At the same time, the theoretical accuracy near magic nuclei has been marginally enhanced, effectively capturing the special interaction effects around magic nuclei and showing good agreement with experimental data.

    nucl-th0 citations
  2. 02

    Quantum Magic and Multi-Partite Entanglement in the Structure of Nuclei

    Florian Brökemeier🇩🇪 · S. Momme Hengstenberg🇩🇪 · James W. T. Keeble🇩🇪 · Caroline E. P. Robin🇩🇪 · Federico Rocco🇩🇪 · Martin J. Savage🇺🇸

    Motivated by the Gottesman-Knill theorem, we present a detailed study of the quantum complexity of -shell and -shell nuclei. Valence-space nuclear shell-model wavefunctions generated by the BIGSTICK code are mapped to qubit registers using the Jordan-Wigner mapping (12 qubits for the -shell and 24 qubits for the -shell), from which measures of the many-body entanglement (-tangles) and magic (non-stabilizerness) are determined. While exact evaluations of these measures are possible for nuclei with a modest number of active nucleons, Monte Carlo simulations are required for the more complex nuclei. The broadly-applicable Pauli-String exact (PSIZe-) MCMC technique is introduced to accelerate the evaluation of measures of magic in deformed nuclei (with hierarchical wavefunctions), by factors of for some nuclei. Significant multi-nucleon entanglement is found in the -shell, dominated by proton-neutron configurations, along with significant measures of magic. This is evident not only for the deformed states, but also for nuclei on the path to instability via regions of shape coexistence and level inversion. These results indicate that quantum-computing resources will accelerate precision simulations of such nuclei and beyond.

    nucl-thquant-phPRC(2025)·58 citations
  3. 03

    Quark saturation in the QCD phase diagram

    Marcus Bluhm🇫🇷 · Yuki Fujimoto🇺🇸 · Larry McLerran🇺🇸 · Marlene Nahrgang🇫🇷

    We determine the onset of Quarkyonic Matter corresponding to values of temperature and baryon chemical potential at which the quark phase space density becomes one. At zero temperature for baryon chemical potentials below the mass of the Lambda baryon, only nucleons contribute to the quark density. This is different at finite temperature, where all baryons, mesons and their resonances can be excited and thus add quarks to the phase space. The probability density to find a quark inside a hadron is determined using the Yukawa ansatz of the IdylliQ model of Quarkyonic Matter. We estimate separately the magnitude of the various contributions of nucleons, Delta baryons, pions as well as further hadrons and resonances. The uncertainty in the parametrization of the probability density to find a quark inside a nucleon is spanned by assuming that at zero temperature the transition density to Quarkyonic Matter is between one and three times that of nuclear matter. Various predictions for a possible critical point associated with the chiral phase transition are found close to a triple point at which the line of the deconfinement transition and the curve associated with the transition to Quarkyonic Matter intersect. These considerations provide an estimate for the region in the QCD phase diagram where Quarkyonic Matter may be found.

    nucl-thhep-phPRC(2025)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE