We studied the nuclear shape evolutions in fission process of ²⁴⁰Pu by the time-dependent Hartree-Fock approach with various Skyrme forces. Calculations are performed for the later phase of the fission with large initial deformations toward the scission. We show that calculations with Skyrme forces with large surface energies and large symmetry energies can have extremely long fission evolution time. The symmetry energy plays a role in the evolution of neutron-rich necks. In addition, we also demonstrated the shape oscillations of fission fragments after the fission. We see that particularly the heavy near-spherical fragments have remarkable octupole oscillations.

我们通过时变的Hartree-Fock方法和各种Skyrme力研究了²⁴⁰ Pu裂变过程中的核形演化。对裂变的后期进行了计算，该裂变的后期具有朝向裂隙的较大初始变形。我们表明，使用具有大表面能和大对称能的Skyrme力进行的计算可能具有非常长的裂变演化时间。对称能量在富中子颈的演化中起作用。此外，我们还证明了裂变后裂变碎片的形状振荡。我们看到特别重的近球形碎片具有显着的八极振荡。