论文标题
重新调查裂变模式的相互作用和重肌动蛋白核中249BK和257md的非平衡裂变过程
Re-investigation of the interplay of fission modes and non-equilibrium fission processes in heavy actinide nuclei 249Bk and 257Md
论文作者
论文摘要
介绍了在融合反应11b和19f + 238238U中产生的actinide Nuclei 249bk和257MD的裂变片段的质量和角度分布的测量。实验观察到的质量比分布在裂变过程中通过裂变模式的相互作用表明“多概率裂变”，它们与使用GEF的计算（“裂变的一般描述”）模型代码的预测非常吻合。此外，为了测试249BK和257MD核中非混合核过程的事件的签名，使用Gemini ++进行了蒙特卡洛统计衰减模型计算，以在所有能量的所有能量下进行测量的质量分布。为了进行比较，还介绍了12C和16o弹丸在238U靶标上产生的250CF和254FM核的相邻重肌动物核的裂变片段质量分布。 19F + 238U反应的测得的角各向异性数据与融合屏障低于融合屏障的过渡状态模型的结果不同。由于本研究的结果，我们建议考虑K松弛时间，动态耗散及其对壳校正的影响之间的相互作用，以了解重型离子诱导的肌动蛋白核中裂变动力学的演变
Measurements of mass and angular distributions of fission fragments from actinide nuclei 249Bk and 257Md, produced in fusion reactions 11B and 19F + 238238U, are presented. Experimentally observed mass ratio distributions indicate 'multi-chance fission' through the interplay of fission modes in the fission process, and they agree well with predictions from calculations using the GEF ('GEneral description of Fission observables') model code. Furthermore, to test the signatures of events from non-compound nuclear processes in the fission of 249Bk and 257Md nuclei, Monte Carlo statistical decay model calculations using GEMINI++ were performed for the measured mass distribution at all energies. For comparison purposes, the fission fragment mass distributions of neighboring heavy actinide nuclei, previously measured in the fission of 250Cf and 254Fm nuclei produced by 12C and 16O projectiles on a 238U target, are also presented. The measured angular anisotropy data for the 19F + 238U reaction differ from the results of the Transition State Model at energies below the fusion barrier. As a result of the present study, we suggest considering the interplay between K relaxation time, dynamic dissipation, and their influence on shell correction to understand the evolution of fission dynamics in heavy-ion-induced actinide nuclei
