Abstract
The variances of the mass distribution of fission fragments for nuclei in the fissility parameter range 30 < Z2/A < 40 have been calculated. The Fokker-Planck equation for the distribution function of collective variables is used as a dynamical equation to describe the descent of the fissioning nucleus from the saddle to scission. The calculations reproduce the experimentally observed increase of the mass variances with a growth of the parameter Z2/A. The increase of the calculated variances is due to a considerable decrease in the stiffness coefficients corresponding to the saddle points for heavy fissioning nuclei and to the non-equilibrium character of the descent.
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The authors would like to thank cordially Dr. Yu.A. Lazarev for many useful discussion and his continuous interest in this work. They are also grateful to Drs. A.V. Ignatyuk, V.M. Kolomietz, V.V. Pashkevich and G.N. Smirenkin for stimulating discussions.
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Adeev, G.D., Gonchar, I.I. The dynamical description of the mass distribution of fission fragments. Z Physik A 320, 451–457 (1985). https://doi.org/10.1007/BF01415722
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DOI: https://doi.org/10.1007/BF01415722