NEW CLUES ON FISSION DYNAMICS FROM SYSTEMSOF INTERMEDIATE FISSILITY

摘要

Systems of intermediate fissility are characterized by an evaporation residues(ER) cross section comparable or larger than the fission cross section, and bya relatively higher probability for charged particle emission in the pre-scissionchannel. In a theoretical framework in which time scale estimates of the fissionprocess rely on statistical model calculations, the analysis of particle emissionin the ER channel is the source of additional constraints on the statistical anddynamical models. This contribution will offer an overall view of the systemsstudied so far and will provide new clues for interesting and contradictory phys-ical cases. In particular, the analysis of the systems 32S + 100Mo at ELab =200 MeV and ~(18)0+ ~(150)SmatE_(Lab) =122 MeV will be presented. Recent ad-vancement will be briefly discussed on the interplay between the fission and theevaporation residues channels as implied by a dynamical (Langevin) approach to the description of the fission process.