Shape evolution and collective dynamics of quasifission in TDHF

Abstract

Background: At energies near the Coulomb barrier, capture reactions in heavy-ion collisions result either in fusion or in quasifission. The former produces a compound nucleus in statistical equilibrium, while the second leads to a reseparation of the fragments after partial mass equilibration without formation of a compound nucleus. Extracting the compound nucleus formation probability is crucial to predict superheavy-element formation cross-sections. It requires a good knowledge of the fragment angular distribution which itself depends on quantities such as moments of inertia and excitation energies which have so far been somewhat arbitrary for the quasifission contribution. Methods: We investigate the evolution of the nuclear density in time-dependent Hartree-Fock (TDHF) calculations leading to quasifission. Our main goal is to extract ingredients of the formula used in the analysis of experimental angular distributions. These include the moment-of-inertia and temperature. We study the dependence of these quantities on various initial conditions of the reaction process. Results: The evolution of the moment of inertia is clearly non-trivial and depends strongly on the characteristics of the collision. The temperature rises quickly when the kinetic energy is transformed into internal excitation. Then, it rises slowly during mass transfer. Conclusions: Fully microscopic theories are useful to predict the complex evolution of quantities required in macroscopic models of quasifission.

10 pages, 7 figures

References in corpus (20)

• Particle transfer reactions with the time-dependent Hartree-Fock theory using a particle number projection technique
• Energy dependence of nucleus-nucleus potential close to the Coulomb barrier
• 3-D unrestricted TDHF fusion calculations using the full Skyrme interaction
• Heavy-ion interaction potential deduced from density-constrained TDHF calculation
• Interplay between quantum shells and orientation in quasi-fission
• Particle number fluctuations and correlations in transfer reactions obtained using the Balian-Vénéroni variational principle
• Fission dynamics within time-dependent Hartree-Fock: deformation-induced fission
• Dissipative dynamics in quasi-fission
• Quasifission and fusion-fission in massive nuclei reactions. Comparison of reactions leading to the Z=120 element
• Microscopic study of Ca$+$Ca fusion
• Excitation energy dependence of fission in the mercury region
• Production of heavy and superheavy nuclei in massive fusion reactions
• Reduced quasifission competition in fusion reactions forming neutron-rich heavy elements
• Microscopic Calculation of Pre-Compound Excitation Energies for Heavy-Ion Collisions
• Neutron Transfer Dynamics and Doorway to Fusion in Time-Dependent Hartree-Fock Theory
• Particle-number projection method in time-dependent Hartree-Fock theory: Properties of reaction products
• TDHF fusion calculations for spherical+deformed systems
• Time-dependent HF approach to SHE dynamics
• Nuclear Giant Resonances and Linear Response
• Superfluid dynamics of 258Fm fission

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