Title: Excitation energy of fission fragments within nuclear time-dependent density functional theory Show Chinese title

Title: 核时间依赖密度泛函理论中裂变碎片的激发能

Abstract: The number and properties of the neutrons and photons emitted in nuclear fission are directly related to the excitation energy of the fission fragments when they are formed at scission. Though not observable experimentally because of the extremely short time scales, the excitation energy of fission fragments can be predicted by microscopic theory based on time-dependent density functional theory (TDDFT). Initial results on the value of the total kinetic energy of fission reactions were very promising, but could not probe all possible fragmentations. In this work, we perform large-scale TDDFT calculations in $^{240}$Pu enabled by the development of a new TDDFT solver. We obtain TDDFT trajectories covering nearly all possible fragmentations. We find that the total kinetic energy is close to experimental values only for the most likely fission while it is severely underestimated at both small and large asymmetries. This conclusion seems rather independent of the parameterization of the energy functional, both in its particle-hole and particle-particle channels. Show Chinese abstract

Abstract: 中子和光子的数量及性质在核裂变过程中直接与裂变碎片形成时的激发能相关。 尽管由于时间尺度极短而无法在实验中观察到，但裂变碎片的激发能可以通过基于时间依赖密度泛函理论（TDDFT）的微观理论进行预测。 关于裂变反应总动能的初始结果非常有希望，但无法探测所有可能的裂变方式。 在这项工作中，我们利用新开发的TDDFT求解器，在$^{240}$Pu上进行了大规模的TDDFT计算。 我们获得了覆盖几乎所有可能裂变方式的TDDFT轨迹。 我们发现，只有在最可能的裂变情况下，总动能才接近实验值，而在小质量和大质量不对称性情况下，总动能被严重低估。 这一结论似乎与能量泛函的参数化方式无关，无论是在粒子-空穴通道还是粒子-粒子通道中都是如此。