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Nuclear Theory·nucl-th

Monday·May 25, 2026

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    [Submitted on 22 May 2026] (cross-list from hep-ph)

    Enhanced Stellar Production of Weakly Interacting Slim Particles from Non-Thermal Nuclear Cascades

    Víctor Fonoll🇪🇸 · Maurizio Giannotti🇪🇸 · Giuseppe Lucente🇺🇸

    Weakly interacting slim particles (WISPs) can be produced in stars through the conversion of non-thermal photons generated in nuclear reactions. Previous studies have generally treated these sources only at the level of their primary injection lines. We show that this picture is incomplete: repeated Compton scatterings redistribute the injected photons into a broad low-energy spectrum, while associated positrons can thermalize and annihilate into a 511~keV line. Together, these effects define a generic non-thermal photon reservoir and thus a broadly applicable source term for any photon-coupled WISP. We develop a general framework for this mechanism and illustrate its impact with the example of dark-photon production in the solar pp chain. Our results show that non-thermal stellar WISP production can be substantially underestimated if Compton reprocessing and positron annihilation are neglected.

    Comments:
    11 pages. 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
    arXiv:
    2605.23317 [pdf]
    0 citations
  2. 05

    [Submitted on 22 May 2026] (cross-list from nucl-ex)

    Observation of Entanglement Enabled Spin-Interference in the Drell-Söding Process in Au+Au Ultraperipheral Collisions at RHIC

    The STAR Collaboration

    We report a measurement of the Drell-Söding production in Au + Au ultraperipheral collisions at a center-of-mass energy per nucleon pair using the STAR detector. For the first time, the Entanglement Enabled Spin-Interference (EESI) effect is observed in the Drell-Söding process through the amplitude of the modulation. The measured exhibits no significant dependence on the invariant mass . An enhancement of three standard deviations is observed for the Drell-Söding process compared to photoproduction. Furthermore, we measure the -dependence of the Drell-Söding process and photoproduction. The Drell-Söding spectrum falls more steeply with and exhibits diffractive structures shifted to lower compared to photoproduction, features that are not captured by theoretical calculations. These results provide new insights into the interplay between quantum interference and photon-nuclear interactions in ultra-peripheral heavy-ion collisions.

    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2605.23615 [pdf]
    1 citation
  3. 06

    [Submitted on 22 May 2026] (cross-list from nucl-ex)

    Probing nuclear interactions à la Rutherford: Insights on He from scattering

    F. Cappuzzello · V. Soukeras · S. Bacca · D. Carbone · M. Cavallaro · L. C. Chamon · I. Lombardo · G. Orlandini · M. Viviani · C. Agodi · H.-W. Becker · G. A. Brischetto and 18 other authors

    Nuclear interactions play a key role for the stability of atomic nuclei and stellar environments. Successful parametrization and models of these interactions, developed in the last decades, accurately reproduce all the proton and neutron scattering data, besides the properties of few-body nuclear systems. However, recent electron scattering results focusing on the first excited resonant state of He nucleus, reveal a puzzling situation suggesting potential gaps in our understanding of the nuclear phenomenology. Here, we report a new study of such He resonance by He + He scattering featuring data of unprecedented sensitivity and state-of-art analyses of the spectral line shape together with a phenomenological reaction modeling that incorporates the same nuclear densities employed in electron-scattering studies. Our analysis of the full set of experimental observables yields a reasonable description within the framework of current nuclear-interaction physics, thereby highlighting the need for further advancing the modeling of few-body open quantum systems.

    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2605.23654 [pdf]
    Nature Commun.(2026)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE