【摘要】 本工作采用金硅面垒型半导体探测器和固体径迹探测器测量了57.0—73.0MeV¹²C+¹⁶⁹Tm,¹⁷⁵Lu,¹⁸¹Ta,W,Re,Pt.¹⁹⁷Au,Pb和²⁰⁹Bi裂变反应碎片角分布和裂变激发函数。由相当于全动量转移的裂变事件的碎片角分布统计理论直接确定了全熔合反应截面σ_fu,从而获得了作为激发能函数的〈Г_f/Г_n〉实验值。与理论计算符合得到裂变位垒高度,标准偏差为2.5MeV。实验上确定的裂变位垒与非旋转液滴模型计算值相符合。用同样方法,我们还分析了已经发表了的¹²C+¹⁷⁴Yb,¹²C+¹⁹⁸Pt,¹⁶O+¹⁴²Nd,¹⁶O+¹⁷⁰Er,¹⁶O+¹⁸¹Ta和¹⁸O+¹⁹²Os裂变反应激发函数,研究了裂变位垒随裂变核质量数A的变化,并且和液滴模型理论做了比较。更多还原

【Abstract】 Angular distributions of fission fragment and fission excitation functions was me-asured for a series of reactions ¹²C+¹⁶⁹Tm, ¹⁷⁵Lu, ^181Ta, W, Re, Pt, ¹⁹⁷Au,Pb and ²⁰⁹Bi in the 57.0--73.0 MeV energy region with mica detectors and gold sur-face barrier silicon detectors. The experimental values 〈Γ_f/Γ_n〉 we are abtainedfrom fission excitation functions and compared to theoretical ones. The variation ofthe experimental values for the fission barrier height with the mass number A of thecompound nuclei was studied and compared to the theoretical predictions by the liquiddrop medel.更多还原