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 $Y\left(N_f\right)$ at fixed fragment charge $Z$ 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 ${}^{244,246}\mathrm{Cm}$ and ${}^{250}\mathrm{Cf}$) as well as neutron-induced fission at thermal and 14-MeV energies for representative actinides in the Th–Pu region (including ${}^{229}\mathrm{Th}$, ${}^{235}\mathrm{U}$, ${}^{239}\mathrm{Pu}$, and ${}^{249}\mathrm{Cf}$). 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.

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• Fission
• Langevin equation