ADVANCES IN THE UNDERSTANDING OF STRUCTUREAND PRODUCTION MECHANISMS FOR SUPERHEAVYELEMENTS

摘要

The talk is aimed to discussion of the problems around production and study ofsuperheavy elements. Different nuclear reactions leading to formation of super-heavy nuclei are analyzed. Dynamics of heavy-ion low energy collisions is stud-ied within the realistic model based on multi-dimensional Langevin equations.Interplay of strongly coupled deep inelastic scattering, quasi-fission and fusion-fission processes is discussed. Collisions of very heavy nuclei (238 u+238 u, 232Th+250Cf and 238u+248 This ) are investigated as an alternative way for production of superheavy elements with increasing neutron number. Largecharge and mass transfer was found in these reactions due to the inverse (anti-symmetrizing) quasi-fission process leading to formation of surviving super-heavy long-lived neutron-rich nuclei. Lifetime of the composite system con-sisting of two touching nuclei is stunied with the objective to find time delayssuitable for the observation of spontaneous positron emission from super-strongelectric field.