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Nuclear Theory·nucl-th

Thursday·February 26, 2026

8 papers—2 primary·6 cross-listed

All8Primary2Cross-lists6
  1. 01

    [Submitted on 25 Feb 2026]

    Isotope-Resolved Ba and Xe Yields in Actinide Fission and Correlated Heavy--Light Fragment Systematics

    K. Pomorski · A. Augustyn · T. Cap · Y. J. Chen · M. Kowal · B. Nerlo-Pomorska · M. Warda · Z. G. Xiao

    Isotope-resolved post-neutron fission yields in the Ba and Xe chains are calculated and benchmarked against evaluated reference data, with emphasis on element-resolved isotopic chains at fixed fragment charge and on the consistency of heavy--light fragment correlations. Calculations are performed within a four-dimensional (4D) Langevin framework employing Fourier-over-Spheroid shape parametrization. The benchmark covers spontaneous fission of selected Cm and Cf isotopes (including Cm and Cf) as well as neutron-induced fission at thermal and 14-MeV energies for representative actinides in the Th--Pu region (including Th, U, Pu, and Cf). The dominant neutron-number maxima are reproduced for a large fraction of the isotopic chains considered, indicating that the mean charge partition and the average neutron content of the main fission channels are described consistently. A systematic residual discrepancy is observed in the isotopic widths: the calculated yields often fall off too rapidly on the distribution tails, producing distributions that are narrower than the evaluated data, most notably for heavy-fragment chains.

    Comments:
    submitted to PRC
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2602.21692 [pdf]
    PRC(2026)·1 citation
  2. 02

    [Submitted on 25 Feb 2026]

    Ab initio calculations of nuclear charge radii across and beyond Sn: Putting chiral EFT nuclear interactions to the test

    Pepijn Demol🇧🇪 · Urban Vernik🇧🇪 · Thomas Duguet🇧🇪 · Alexander Tichai🇩🇪

    Charge radii are investigated along the Tin isotopic chain via ab initio Bogoliubov coupled cluster calculations at the singles and doubles level. In addition to the reproduction of absolute radii, the parabolic behavior of isotopic shifts between the N = 50 and N = 82 magic numbers and the kink through Sn are shown to provide stringent tests for state-of-the-art chiral effective field theory (EFT) inter-nucleon interactions. Indeed, none of the employed fine-tuned interactions can capture all such key characteristics. Eventually, the pronounced sensitivity of the results to the employed Hamiltonian beyond Sn provides a unique playground to pin down critical attributes of EFT inter-nucleon interactions in the future. This calls for measuring isotopic shifts both towards Sn and beyond Sn, as well as for performing high-accuracy ab initio calculations of mean-square radii in heavy open-shell nuclei by adding both triples corrections to the many-body wave function and the two-body charge density correction to the operator

    Comments:
    published version, 7 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2602.22030 [pdf]
    PLB(2026)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE