Abstract
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 towards 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.
Highlights
Nuclear fission is a very complex and large amplitude collective motion of many-body quantum systems
The aim of the present work is to study the role of different Skyrme force in nuclear fission dynamics, as well as the oscillations of fission fragments based on the time-dependent Hartree-Fock (TDHF) framework, which can capture the major features of real-time fission dynamics, at least close to scission
To study the influences of surface energies in fission dynamics, we adopted the series of SLy5sX forces [33]
Summary
Nuclear fission is a very complex and large amplitude collective motion of many-body quantum systems. Fission was discovered in 1939, the development of a fully self-consistent and predictive microscopic fission theory is still very challenging [1, 2]. Thanks to the developments of supercomputing capabilities in recent years, microscopic fission theory has achieved remarkable progresses. The time-dependent Generator-Coordinate Method [5,6,7] as an adiabatic dynamical fission theory can describe reasonably well the mass distributions of fission yields, based on parallel calculations of complex potential energy surfaces. The time-dependent Hartree-Fock (TDHF) or timedependent density functional theory [8,9,10,11,12,13,14,15,16] as a non-adiabatic dynamical theory is helpful for understanding fission mechanisms, in the part of the trajectory close to scission
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
