Born-Oppenheimer expansion: from muon distribution to dissipation in fission

It is shown that consistent treatment of the momentum translation in the problem of muon distribution of the prompt fission fragments modifies the nonadiabatic transition operator in the Born-Oppenheimer expansion and eliminates difficulties noted in earlier calculations. The muon distribution for very asymmetric prompt fission turns out to be highly sensitive to the velocity of the primary fragments at the scission point. The mean collective energy dissipated during saddle-to-scission discrete due to the one-body mechanism is calculated within the framework of the same approach