利用两步模型对可能合成Z＝117的核反应~(48)Ca+~(249)Bk进行了研究.模型将熔合过程分为弹靶接触前的粘连过程和从弹靶接触到形成复合核的形成过程.结合统计蒸发模型,计算了297117蒸发数个中子的剩余截面.结果表明,在激发能E＝31 MeV且复合核蒸发3中子时的剩余截面最大,为0.34 pb,已经可以用实验方法进行探测.
A possible way to synthesize superheavy element (Z=117) by using ~(48)Ca+~(249)Bk reaction is studied with two step model. The fusion process is divided into two steps- the sticking process that the projectile approaches to the target to get contacted with the target by passing over the Coulomb barrier, and the formation process that the di-nuclear system evolves from contact into compound nuclear state. Combined with the statistical evaporation model, the formation cross section of 297117 is calculated. The result shows that the residue for 3 neutron evaporation is 0.34 pb at excitation energy E* =31 MeV, which is detectable in laboratory.
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