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How much energy is turned into heat on the way to scission, and why extra input energy goes mostly to the heavy fragment, are not understood from first principles.","posed_since":"","precise":"For $235\\mathrm{U}(\\mathrm{n},\\mathrm{f})$ and $239\\mathrm{Pu}(\\mathrm{n},\\mathrm{f})$, determine the partition of the total excitation energy TXE (approximately 20 to 30 MeV) between light and heavy fragments as a function of fragment mass, and the fraction of collective energy dissipated into intrinsic excitation between saddle and scission. The answer must reproduce the sawtooth of prompt neutron multiplicity $\\nu(A)$ and its change with incident neutron energy, where added excitation appears mainly in the heavy fragment.","problem_ref":null,"references":"","settled_by":"A microscopic dynamical calculation, with no parameters fitted to neutron multiplicities, that reproduces $\\nu(A)$ and its incident-energy dependence for at least two actinides.","status_note":"","title":"Energy sharing and dissipation between fragments at 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