变形核强阻尼碰撞中巨复合体系的形成和衰变

Giant Composite System Formation and Decay in Strongly Damped Collisions with Deformed Nuclei

利用改进的量子分子动力学(ImQMD)模型研究了质心系入射能量为980 MeV时变形核238U+238U体系的3种不同碰撞模式(腹对腹、尖对腹和尖对尖)下强阻尼反应过程中初级超重碎块的产生几率和复合体系的寿命、形状和拉长取向等性质,发现尖对腹碰撞模式有利于初级超重碎块的产生,还发现这种碰撞模式产生的复合体系有最长的寿命。

Three different collision modes （ Belly-belly, Belly-tip and Tip-tip） of the deformed uranium nu- cleus 238U bombarding the deformed 238U in strongly damped reaction at the incident energy 980 MeV has been investigated based on the improved quantum molecular dynamics （ImQMD） model. The formation and properties of the formed composite system during the reaction process were carefully studied including the lifetime, the shape configuration and the angular distribution of primary fragment. It was found that the Belly-tip mode is suitable for producing the super heavy fragments, and the composite system has the longest lifetime in this mode.