Fission dynamics, dissipation and clustering at finite temperature

Abstract

The saddle-to-scission dynamics of the induced fission process is explored using a microscopic finite-temperature model based on time-dependent nuclear density functional theory (TDDFT), that allows to follow the evolution of local temperature along fission trajectories. Starting from a temperature that corresponds to the experimental excitation energy of the compound system, the model propagates the nucleons along isentropic paths toward scission. For the four illustrative cases of induced fission of ${}^{240}$Pu, ${}^{234}$U, ${}^{244}$Cm, and ${}^{250}$Cf, characteristic fission trajectories are considered, and the partition of the total energy into various kinetic and potential energy contributions at scission is analyzed, with special emphasis on the energy dissipated along the fission path and the prescission kinetic energy. The model is also applied to the dynamics of neck formation and rupture, characterized by the formation of few-nucleon clusters in the low-density region between the nascent fragments.

arXiv comment31 pages, 10 figures

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• Time-dependent Hartree-Fock study of quasifission trajectories in reactions forming ${}^{294}$Og
• Multinucleon transfer with time-dependent covariant density functional theory
• Generalized time-dependent generator coordinate method for induced fission dynamics
• Ternary quasifission in collisions of actinide nuclei
• Nuclear Quantum Many-Body Dynamics: From Collective Vibrations to Heavy-Ion Collisions (2nd edition)
• Entanglement in multinucleon transfer reactions
• Time-dependent density functional theory study of induced-fission dynamics of ${}^{226}$Th
• Non-Markovian character and irreversibility of real-time quantum many-body dynamics
• Examining the justification for the introduction of a fermion localization function