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Nuclear Theory·nucl-th

Friday·April 17, 2026

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 01

    [Submitted on 15 Apr 2026]

    Constraining the Shell Gap in C via Transfer to the Continuum in the CC Reaction

    P. Punta · J. A. Lay · A. M. Moro · J. Lois-Fuentes · B. Fernández-Domínguez

    Recently, a semi-microscopic structure model has been presented to study the structure of a weakly-bound, two-body nucleus with a deformed core, including Pauli-blocking effects. The model has been successfully applied within the adiabatic distorted wave approximation (ADWA) reaction framework to study the reactions C(d, p)C, restricting the analysis to bound states of the residual C nucleus. In these calculations, the structure of C is described using the recently presented semimicroscopic Nilsson+AMD model (NAMD), considering different Pauli-blocking methods. In the present work, the analysis is extended to unbound states of this nucleus with the aim of constraining the location of the single-particle strength and infer the shell-gap. Comparing the measured energy differential cross section for this reaction with calculations in which the position of the orbital is arbitrarily varied, we conclude that a large shell-gap (>5 MeV) is required, in agreement with recently reported value from [J. Lois-Fuentes et al., Phys. Lett. B 867, 139600 (2025)].

    Comments:
    7 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2604.14423 [pdf]
    PLB(2026)·1 citation
  2. 02

    [Submitted on 16 Apr 2026]

    Perturbative calculations of light nuclei up to NLO in chiral effective field theory

    Oliver Thim🇸🇪 · Andreas Ekström🇸🇪 · Christian Forssén🇸🇪

    We predict ground-state energies of H, He, and Li in chiral effective field theory up to next-to-next-to-next-to-leading-order (NLO) using a power counting guided by renormalization-group invariance. Subleading two-nucleon interactions are treated perturbatively, and for He and Li, we calculate the perturbative corrections from numerical derivatives of ground-state energies obtained with Lanczos diagonalization. We find that including the H binding energy in the calibration is essential for robust predictions of He and Li. This work demonstrates that the employed power counting can be applied to construct nuclear interactions with predictive power for light nuclei, bringing nuclear structure predictions closer to a foundation in quantum chromodynamics.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2604.14985 [pdf]
    2 citations
  3. 03

    [Submitted on 15 Apr 2026] (cross-list from nucl-ex)

    Measurement of the Gerasimov-Drell-Hearn integrand for proton and deuteron from 200 to 1400 MeV

    P. Pedroni · F. Afzal · S. Abt · P. Achenbach · J.R.M. Annand · H.J. Arends · S.D. Bass · M. Biroth · R. Beck · N. Borisov · A. Braghieri · W.J. Briscoe and 50 other authors

    New data for the total inclusive helicity-dependent cross section for the proton and deuteron were obtained in the photon energy interval 200-1400 MeV. The experiment was performed at the A2 tagged-photon facility of the Mainz Microtron (MAMI) using a circularly polarized photon beam and longitudinally polarized proton and deuteron targets. The reaction products were detected using the large-acceptance Crystal Ball/TAPS calorimeter, which covers 97% of the full solid angle. These new results, obtained with fine energy binning, significantly expand both the quantity and the quality of the available data for these observables and enable a detailed comparison with state-of-the-art theoretical calculations. From the combination of the results for the deuteron and the proton, important information could also be extracted for the free neutron. Based on these data, and using existing models to evaluate the missing contributions from unmeasured photon energy regions, the validity of the Gerasimov-Drell-Hearn (GDH) sum rule has been verified for the proton, the neutron, and the deuteron. These new data provide a precise experimental benchmark for theoretical models used to study nucleons, both in their free state and when embedded in the nuclear medium.

    Comments:
    16 pages, 9 figures
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2604.14385 [pdf]
    1 citation
  4. 04

    [Submitted on 16 Apr 2026] (cross-list from hep-lat)

    A minimal implementation of Yang-Mills theory on a digital quantum computer

    Georg Bergner🇩🇪 · Masanori Hanada🇬🇧 · Emanuele Mendicelli🇬🇧

    We present a minimal implementation of SU() pure Yang-Mills theory in dimensions for digital quantum simulation, designed to enable quantum advantage. Building on the orbifold lattice simulation protocol with logarithmic scaling in the local Hilbert-space truncation, we introduce further simplified Hamiltonians. Furthermore, we test simple methods that improve the convergence to the infinite mass limit, thereby removing the requirement of a large scalar mass to obtain the Kogut-Susskind Hamiltonian. For the SU(2) theory, we can cut the resource requirement further by utilizing the embedding of into . Monte Carlo simulations of the Euclidean path integral were used to benchmark the accuracy of these new analytical improvements to the theory. These results provide further support for the noncompact-variable-based approach as a practical framework for quantum simulation of non-Abelian gauge theories.

    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2604.15132 [pdf]
    4 citations

Affiliations

first authorsco-authorsvia INSPIRE