Light-particle emission from the fissioning nuclei Ba-126, Pt-188 and (266,272,278)110: theoretical predictions and experimental results

We present a comparison of our model treating fission dynamics in conjuncti on with light-particle (n, p, alpha) evaporation with the available experim ental data for the nuclei Ba-126, Pt-188 and three isotopes of the element Z = 110. The dynamics of the symmetric fission process is described through the solution of a classical Langevin equation for a single collective vari able characterizing the nuclear deformation along the fission path. A micro scopic approach is used to evaluate the emission rates for prefission light particles. Entrance-channel effects are taken into account by generating a n initial spin distribution of the compound nucleus formed by the fusion of two deformed nuclei with different relative orientations. (C) 2000 Elsevie r Science B.V. All rights reserved.