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Nuclear Theory·nucl-th

Wednesday·December 18, 2024

8 papers—2 primary·6 cross-listed

All8Primary2Cross-lists6
  1. 01

    [Submitted on 15 Dec 2024]

    Radiative Capture Reaction in Cluster Effective Field Theory

    F. Nazari · M. Radin · M. Moeini Arani

    In this study, we focus on the radiative capture process of the deuteron on alpha particle leading to the formation of in the two-body formalism through the cluster effective field theory~(CEFT). It was the primitive nuclear reaction to produce in a few minutes after the Big Bang. In detail, we outline the calculation of the dominant and electromagnetic transition amplitudes of . Then, we obtain the astrophysical S-factor by fitting it to the experimental data. Finally, we compare the obtained CEFT results for the astrophysical S-factor with the other theoretical results.

    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    2412.12205 [pdf]
    PTEP(2025)·1 citation
  2. 02

    [Submitted on 17 Dec 2024]

    Neutron Star Properties and Femtoscopic Constraints

    I. Vidana🇮🇹 · V. Mantovani Sarti🇩🇪 · J. Haidenbauer🇩🇪 · D. L. Mihaylov🇩🇪 · L. Fabbietti🇩🇪

    We construct the equation of state of hypernuclear matter and study the structure of neutron stars employing a chiral hyperon-nucleon interaction of the Jülich--Bonn group tuned to femtoscopic data of the ALICE Collaboration, and and N interactions determined from lattice QCD calculations by the HAL QCD Collaboration that reproduce the femtoscopic and data. We employ the ab-initio microscopic Brueckner--Hartree--Fock theory extended to the strange baryon sector. A special focus is put on the uncertainties of the hyperon interactions and how they are effectively propagated to the composition, equation of state, mass-radius relation and tidal deformability of neutron stars. To such end, we consider the uncertainty due to the experimental error of the femtoscopic data used to fix the chiral hyperon-nucleon interaction and the theoretical uncertainty, estimated from the residual cut-off dependence of this interaction. We find that the final maximum mass of a neutron star with hyperons is in the range , in agreement with previous works. The hyperon puzzle, therefore, remains still an open issue if only two-body hyperon-nucleon and hyperon-hyperon interactions are considered. Predictions for the tidal deformability of neutron stars with hyperons are found to be in agreement with the observational constraints from the gravitational wave event GW170817 in the mass range .

    Comments:
    10 pages, 3 figures, 3 tables. Accepted for publication in the European Journal of Physics A
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2412.12729 [pdf]
    EPJA(2025)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE