摘要
实验对25MeV／u^(40)Ar＋^(209)Bi体系的裂变反应，利用线性动量转移的分窗选择不同的激发能，研究裂变动能分布和质量分布与热核初始激发能的关系．实验证实激发能小于380MeV时裂变总动能分布与低激发能复合核相似．激发能大于380MeV时，最可几动能呈现出随激发增加而增加，并出现高能非对称性，而且质量分布宽度随激发能增加而迅速增大．
The distribution properties of the total fission kinehc energy and of themass of fission fragments at different initial excitation energies of hot nuclei in thereaction 25MeV / u ^(40)Ar +^(209)Bi are investigated. The initial excitation energies areobtained according to the linear momentum transfer. The experimental results showthat the fission kinetic energy distribution is similar to the case of compound nucleiwith lower excitation energy when the initial excitation energy of hot nuclei is below380MeV. While the inihal excitation energy is above 380MeV, the most probablevalue of fission kinehc energy increases with the inihal excitahon energy. The fissionenergy spectra become asymmetric due to an enhancement of the yield at higherkinehc energies, and the width of mass distribution increases rapidly.
出处
《高能物理与核物理》
CSCD
北大核心
1999年第5期409-416,共8页
High Energy Physics and Nuclear Physics
基金
国家自然科学基金!19235011
关键词
裂变
碎片总功能
激发能
中能
重离子
氩40
fission, total kinetic energy of fission fragments, excitation energy
