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利用裂变碎片的折叠角分布,从实验上实现了全熔合裂变和转移跟随裂变两种成份的区分.在此基础上测量了质心系能量72.61至80.11MeV16O+232Th全熔合裂变截面和碎片角分布.包含靶核静态形变效应的耦合道模型计算与实验激发曲线一致.然而,裂变统计理论无法解释实验上观察到的全熔合裂变碎片角分布.而鞍点模型与断点模型的理论预言有较明显的差别.
The fission angle distribution of fission fragments is used to realize the distinction between fission and fission transfer. Based on this, the full fusion fission cross section and the angular distribution of fragments of the centroid system energies of 72.61 to 80.11MeV16O + 232Th were measured. The coupled-channel model including the static deformation effect of the target nucleus is consistent with the experimental excitation curve. However, the statistical theory of fission can not explain the experimentally observed angular distribution of fission fragments. The saddle point model and breakpoint model of the theoretical predictions have more obvious differences.