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Study of fission dynamics with a three-dimensional Langevin approach

机译：用三维典范方法研究裂变动力学

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The three-dimensional Langevin model plus a constraint on the heavy fragment deformation is used to study the fission dynamics for uranium and plutonium isotopes at low excitation energies. The potential energy surface is calculated with the macroscopic-microscopic model based on the two-center shell model. The Werner-Wheeler approximation is used to calculate the inertia tensor and the wall-and-window model is applied to calculate the friction tensor. In this work, the influence of the model parameters on the fission fragment mass distribution is investigated. The fission fragment mass distributions for U-234,U-236,U-239 and Pu-240 at low excitation energies are calculated and compared with the results of GEF code as well as the evaluated data of ENDF/B-VIII.0. A nice agreement is found in the comparison, in which the incorporation of the constraint on the heavy fragment deformation plays an important role. In addition, the dependence of the mass distribution on the excitation energies for n + U-235 fission is also studied within the model. Furthermore, the correlation between the elongation and mass asymmetry at the scission point and the correlations of the fission time with both the elongation and mass asymmetry are studied. This study may shed light on understanding the dynamics of the superlong channel for symmetric fission and the standard channels for asymmetric fission in the GEF model and other phenomenological fission models.
机译：三维Langevin模型加上重型片段变形的约束用于研究低励磁能量下铀和钚同位素的裂变动力学。基于双中心壳模型，用宏观 - 微观模型计算电位能表面。 Werner-Wheeler近似用于计算惯性张量，墙壁模型应用于计算摩擦张量。在这项工作中，研究了模型参数对裂变片段质量分布的影响。计算低励磁能量的U-234，U-236，U-239和PU-240的裂变片段质量分布，并与GEF码的结果以及Endf / B-VIII.0的评估数据进行比较。在比较中发现了一个很好的一致性，其中纳入重型片段变形的约束起着重要作用。另外，在模型内还研究了批量分布对N + U-235裂变的激发能量的依赖性。此外，研究了狭称点处的伸长和质量不对称性与裂变时间与伸长伸长和质量不对称的相关性之间的相关性。本研究可以阐明在理解对称裂变的超延伸通道的动态和GEF模型中不对称裂变的标准通道和其他现象学裂变模型。

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