Study On The Possibility Of Using Multinucleon Transfer Reaction To Synthesize Super-heavy Nuclei

The research of the properties of super-heavy elements?SHE?and the way of synthesizing them is an important region of nuclear physics.As the development both of experiment technologies and theoretical models,physicists make a great progress in synthesizing super-heavy nucleus.So far,one of the most successful synthesis of super-heavy nuclei experiment method is using heavy target nuclear fusion reaction at first,evaporation and the evaporation residual nuclear recoil separation,implanted in the residual nuclear position sensitive detector,with its decay chain to determine whether super-heavy nuclei.At present,the super-heavy elements of Z=110 to 118have been successfully synthesized in the laboratory,but these synthetic super-heavy nuclear life is very short.Experiment technologies and theoretical models have encountered different bottlenecks in the synthesis of super-heavy nuclei.So it is very important to explore new ways an for super-heavy nuclear synthesis in theory.In a heavy nuclear system,the fusion cross section cannot be described simply by considering the coulomb barrier.Because fusion in the heavy nuclear system that reduces the probability of forming a composite nucleus.Therefore,multiple nucleon transfer processes in low energy heavy ion collisions have opened a new field of study for the synthesis of super-heavy nuclei.In this thesis,retrospect the theory of nuclei and super-heavy nuclei history in a briefly way.And then we introduced the two step model both the basic idea and detail.The two-step model is modified to apply the study of multi-nucleon transfer reaction.The mass distributions of fragments of quasi-fission of the reaction¹³⁶Xe?10?²⁰⁸Pbhas been calculated at different bombard energies.The experiments data were compared with the theoretical results well.In the fourth chapter,there will be a concrete analysis.Show the rational of the two-step Model.According to the modified two-step model,the quasi-fission mass distribution in different energies is compared with the stable nuclear distribution after quasifission vaporized particles.Analysis of the isotopic sections of the constituent elements vary with excitation energy.In this way,multiple nucleon transfer reaction is used to synthesize the superheavy nuclei.