Dissipative dynamics in quasi-fission

Abstract

Quasi-fission is the primary reaction mechanism that prevents the formation of superheavy elements in heavy-ion fusion experiments. Employing the time-dependent density functional theory approach we study quasi-fission in the systems ${}^{40,48}$Ca+${}^{238}$U. Results show that for ${}^{48}$Ca projectiles the quasi-fission is substantially reduced in comparison to the ${}^{40}$Ca case. This partly explains the success of superheavy element formation with ${}^{48}$Ca beams. For the first time, we also calculate the repartition of excitation energies of the two fragments in a dynamic microscopic theory. The system is found in quasi-thermal equilibrium only for reactions with ${}^{40}$Ca. The differences between both systems are interpreted in terms of initial neutron to proton asymmetry of the colliding partners.

5 pages, 4 figures

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• Time-dependent Hartree-Fock plus Langevin approach for hot fusion reactions to synthesize the $Z=120$ superheavy element
• Exploring Zeptosecond Quantum Equilibration Dynamics: From Deep-Inelastic to Fusion-Fission Outcomes in ${}^{58}$Ni+${}^{60}$Ni Reactions
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• Multi-Nucleon Transfer in Central Collisions of ${}^{238}$U + ${}^{238}$U
• Evidence for the role of proton shell closure in quasi-fission reactions from X-ray fluorescence of mass-identified fragments
• Comparison of fission and quasi-fission modes
• Dynamical effects in fusion with exotic nuclei
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• Quantal Nucleon Diffusion I: Central Collisions of Symmetric Nuclei
• Microscopic dynamics simulations of multi-nucleon transfer in ${}^{86}$Kr+${}^{64}$Ni at 25 MeV/nucleon
• Microscopic study of the compound nucleus formation in cold-fusion reactions
• Merging of transport theory with TDHF: multinucleon transfer in U+U collisions
• Effects of the tensor force on low-energy heavy-ion fusion reactions: A mini review
• Simulation of fusion and quasi-fission in nuclear reactions leading to production of superheavy elements using the Constrained Molecular Dynamics model
• Microscopic study of the effect of intrinsic degrees of freedom on fusion
• Time-dependent mean-field investigations of the quasifission process