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Nuclear Theory·nucl-th

Tuesday·January 6, 2026

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 01

    Neutron skins probed in proton knockout from neutron-rich nuclei

    C.A Bertulani🇺🇸 · R.V. Lobato🇧🇷

    Proton-induced quasifree knockout reactions provide a powerful probe of nuclear single-particle structure and reaction dynamics in both stable and neutron-rich nuclei. In this work we develop a unified theoretical framework for the calculation of inclusive (p,2p) and sequential (p,3p) reaction cross sections and fragment momentum distributions at intermediate and relativistic energies. The approach is based on a probabilistic extension of Glauber multiple-scattering theory combined with microscopic nuclear densities obtained from Hartree-Fock-Bogoliubov calculations using Skyrme energy-density functionals. We focus in particular on the sensitivity of total cross sections and longitudinal momentum dispersions to neutron-skin thickness along isotopic chains. Our results indicate that both (p,2p) and (p,3p) reactions exhibit a systematic decrease of cross section and momentum width with increasing neutron excess, reflecting enhanced attenuation and surface bias induced by neutron skins. The effect is significantly stronger for two-proton removal, suggesting that (p,3p) reactions may offer enhanced sensitivity to isovector nuclear structure. These findings establish proton-induced knockout reactions as complementary hadronic probes of neutron skins and the density dependence of the nuclear symmetry energy.

    nucl-thPRC(2026)·2 citations
  2. 02

    Microscopic Description of Rotational Nuclear Fission Elucidates Fragment Spin Generation and Scission Mechanism

    Yu Qiang · Zhibo Li · Junchen Pei

    The generation of fission fragment spin as a probe of scission mechanism remains a question of considerable interests. We present here microscopic calculations of rapidly rotating fission of the compound nucleus 240Pu under varying initial conditions within the time-dependent density functional theory framework. The obtained spin ratio of light to heavy nascent fragments is unchanged up to high spins but diminished as excitation energies increase, indicating sawtooth structures in fragment spins would fade away at high excitations rather than high angular momentum. Further analysis elucidates that the bending scission mode is predominated at low excitation energies, which has been under intense debates. Results also show thicker and elongated neck configurations, along with scission nucleons emitted perpendicular to the fission axis, owing to rapid rotations. These findings offer insights into the scission mechanism of rotating compound nuclei that have usually been overlooked in earlier studies.

    nucl-th1 citation
  3. 03

    Comment on QED Corrections to the Parity Violating Asymmetry in High-Energy Electron-Nucleus Scattering

    Brendan T. Reed🇺🇸 · C. J. Horowitz🇺🇸

    In a recent letter Roca-Maza and Jakubassa-Amundsen claim a large radiative correction to the parity-violating asymmetry in electron-nucleus scattering. If true, this would be important for the interpretation of the PREX, CREX, and MREX experiments. However, Roca-Maza and Jakubassa-Amundsen do not explicitly include the axial-vector vertex correction to exchange (at the momentum transfer of the experiment). We show that including this cancels much of the change in .

    nucl-thhep-phnucl-ex5 citations
  4. 04

    Searching for the Tetraneutron Resonance on the Lattice

    Linqian Wu🇨🇳 · Serdar Elhatisari🇸🇦 · Ulf-G. Meißner🇨🇳 · Shihang Shen🇨🇳 · Li-Sheng Geng🇨🇳 · Youngman Kim🇰🇷

    The nature of the tetraneutron () system remains a pivotal question in nuclear physics. We investigate the system using nuclear lattice effective field theory in finite volumes with a lattice size up to ~fm, employing both a high-precision NLO interaction and a simplified SU(4) symmetric one. The ground-state energy is found to decrease smoothly with increasing box size, showing no plateau characteristic of a resonance. We further compute the dineutron-dineutron scattering phase shift using Lüscher's finite-volume method. At the smallest relative momenta, the extracted -- -wave phase shift is small, consistent with a weak interaction in the dilute limit. At intermediate momenta, it exhibits a weak attraction with a peak of approximately at relative momentum of 60--84~MeV. While this structure does not constitute a resonance, the corresponding confined energy of 1.7--3.3~MeV lies close to the experimentally observed low-energy peak.

    nucl-thPRL(2026)·5 citations
  5. 05

    Exploring bound states and interactions of the nucleon-antinucleon system in a constituent quark model

    Aaron Park🇰🇷 · Sungtae Cho🇰🇷 · Su Houng Lee🇰🇷

    In this work, we study the nucleon-antinucleon system in a constituent quark model. We first construct the nucleon-antinucleon wave function such that the multiquark and multiantiquark components each satisfy the Pauli exclusion principle, and then investigate the possibility of a bound state using a Hamiltonian that includes color-color, spin-dependent interactions and three-quark potentials. Our results indicate that, in specific channels, the nucleon-antinucleon interaction exhibits significant attraction, suggesting a strong possibility of a bound state.

    nucl-thhep-ph0 citations

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