Abstract
The behaviour of the dynamical mass parameters in the nuclear fission process has been considered. The mass asymmetry--neck mixing mass parameter is studied as a function of the different five collective coordinates by taking the temperature into account. Mathematical expressions are obtained for the mass asymmetry--neck mixing mass parameter using the cranking model. Numerical calculations of the obtained analytical expressions are carried out for the two fissioning nuclei exp 236 U and exp 238 U. The present calculations show the dependence of the mass asymmetry--neck mixing mass parameter on each of the different five collective coordinates and also on the temperature. The results of the present calculations show the strong dependence of the dynamical mass parameters on the collective coordinates as well as the importance of the temperature which should be taken into account.