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Background: Precise understanding of nuclear fission is crucial forexperimental and theoretical nuclear physics, astrophysics, and industrialapplications; however, the complete physical mechanics is unresolved due to thecomplexities.  Purpose: In this study, we present a new method to describe thedynamical-fission process and following prompt-neutron emission, where wecombine the dynamical fission calculation based on the Langevin method and theHauser-Feshbach statistical model.  Methods: Two methods are connected smoothly within the universal chargedistribution and the energy conservation, allowing us to calculate a sequenceof fission dynamics and post-fission phase, including prompt neutron emission.  Results: Using a certain set of model parameters, we successfully reproducethe experimental primary-fission yields, total kinetic energy,independent-fission yields, and prompt neutron emissions for the neutroninduced fission of ${}^{236}$U, a compound nucleus of ${\rm n} + {}^{235}{\rmU}$. We elucidate the physical mechanism of the characteristic featuresobserved in previous experiments, such as shell properties. Additionally, weapply our calculation to two very neutron-rich uranium isotopes, i.e.,${}^{250}$U and ${}^{255}$U, which are not experimentally confirmed but areimportant for r-process nucleosynthesis. Theoretical results indicate that${}^{250}$U exhibits an asymmetric multiple-peak fission yield distribution,while the neutron-rich ${}^{255}$U has a single peak due to symmetric fission.Our method predicts post-neutron emission fragments, where ${}^{250}$U shows astronger neutron emissivity than ${}^{255}$U.  Conclusions: Our framework is highly reproducible in the experiments andshows that the number of emitted neutrons after fission differs significantlyin neutron-rich uranium fission depending on distributions of fissionvariables.

Postfission properties of uranium isotopes: A hybrid method with Langevin dynamics and the Hauser-Feshbach statistical model