以Ti为弹核研究超重核的合成机制

Investigation on the mechanism of synthesizing superheavy elements with Ti as a projectile

近年来,合成超重核已经成为核物理研究的热点问题,无论在实验还是在理论上都取得较大地进展。这里选择50 Ti作为弹核去轰击靶核,来合成更重的超重核[1],用到的模型为两步模型,第1步为弹靶的粘连阶段,第2步为弹靶形成复合核阶段,且都用朗之万方程来描述。首先,系统地计算出合成超重核的生成截面,包括粘连几率、形成几率、熔合几率;其次,进一步研究了以50 Ti作为弹核研究超重核的合成机制,给出各反应的剩余截面、分离能、激发能、壳修正能、反应能值与质量数的关系,说明以上物理因素对机制的影响;最后,分析了合成超重核的同位素依赖性,研究表明,超重核的形成是一个极其复杂的动力学过程,其形成几率受诸多方面的影响。

In recent years,the synthesis of superheavy elements has become one of the hot study fields in nuclear physics.Much progress have been obtained both in experiments and theories.In this work,element Ti is chosen as a projectile bombarded actinide targets to synthesize superheavy element.Sticking probabilities,formation probabilities and fusion probabilities are calculated with two-step model.In the model the fusion process is divided into two parts：sticking process and formation process,both of which the two parts can descript both with Langevin equation.The firstly ystem to calculate the synthesis of superheavy nuclei generation section was calculated systematically,including sticking probabilities,formation probabilities and fusion probabilities.Secondly this paper further studies the fusion mechanism of heavy nucleus 50 Ti was studied as revers synthesis,by giving with mass number and the rest of the cross section of each reaction,dissociation energy,system can separate,excitation energy,reaction ability,shell correlation energy,can relationship curve correction,which can be used to illustrate the influence of above factors on the fusion mechanism,and analyzed the synthesis of superheavy nuclei isotopic dependence was analyzied,and studies have shown that the formation of the super-heavy nuclei is an extremely complex dynamic process,and its formation rate is influenced by many aspects.