Dissipative dynamics in quasifission

Oberacker, V. E.; Umar, A. S.; Simenel, C.

doi:10.1103/physrevc.90.054605

Cited by 107 publications

(167 citation statements)

References 64 publications

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“…The feasibility of using TDHF for quasifission has only been recognized recently [33,42,43]. By virtue of long contact-times for quasifission and the energy, orientation and impact parameter dependencies, these calculations require extremely long CPU times and numerical accuracy [91][92][93]105].…”

Section: Resultsmentioning

confidence: 99%

“…The Hartree-Fock approximation and its time-dependent generalization, the time-dependent Hartree-Fock theory, have provided a possible means to study the diverse phenomena observed in low energy nuclear physics [41,42]. In general modern TDHF calculations provide a useful foundation for a fully microscopic many-body description of large amplitude collective motion including collective surface vibrations and giant resonances [48][49][50][51][52][53][54][55][56][57][58][59][60][61] nuclear reactions in the vicinity of the Coulomb barrier, such as fusion [36,39,[62][63][64][65][66][67][68][69], deepinelastic reactions and transfer [70][71][72][73][74][75][76], and dynamics of (quasi)fission fragments [33,[43][44][45][46][47].…”

Section: Formalism a Tdhf And Dc-tdhf Approachesmentioning

confidence: 99%

“…It is therefore common practice to investigate a subset of specific orientations depending on the reaction mechanism one is interested to investigate. For instance, it is sufficient to study "side collisions" in order to investigate the competition between quasifission and fusion in collisions with actinide nuclei [43].…”

Section: Formalism a Tdhf And Dc-tdhf Approachesmentioning

confidence: 99%

“…In particular, the time-dependent Hartree-Fock theory [40], has been recognized for its realistic description of several low-energy nuclear reaction mechanisms [41,42]. It has been recently utilized for studying the dynamics of quasifission [25,33,43,44] and scission [45][46][47]. The study of quasifission is showing a great promise to provide insight based on very favorable comparisons with experimental data [25,33].…”

Section: Introductionmentioning

confidence: 99%

“…These are indeed the relevant quantities for fragment mass-angle distributions and angular distribution analyses. These quantities are computed for collisions between calcium isotopes and actinides for which the TDHF approach has been shown to provide a deep insight into the quasifission reaction mechanisms [33,43,44].…”

Section: Introductionmentioning

confidence: 99%

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Shape evolution and collective dynamics of quasifission in the time-dependent Hartree-Fock approach

2015

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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 crosssections. 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.Purpose: Our main goal is to utlize the time-dependent Hartee-Fock (TDHF) approach to extract ingredients of the formula used in the analysis of experimental angular distributions. These include the moment-of-inertia and temperature.Methods: We investigate the evolution of the nuclear density in TDHF calculations leading to quasifission. We study the dependence of the relevant 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.

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Section: Resultsmentioning

confidence: 99%

Section: Formalism a Tdhf And Dc-tdhf Approachesmentioning

confidence: 99%

Section: Formalism a Tdhf And Dc-tdhf Approachesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shape evolution and collective dynamics of quasifission in the time-dependent Hartree-Fock approach

2015

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From Light to Hyper-heavy Molecules and Neutron-Star Crusts in a Dynamical Mean-Field Approach

Simenel

2014

Clusters in Nuclei, Volume 3

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The richness of phenomena occurring in heavy-ion collisions calls for microscopic approaches where the motion of each nucleon is treated quantum mechanically. The most popular microscopic approach for low-energy collisions between atomic nuclei is the time-dependent Hartree-Fock (TDHF) theory, providing a mean-field dynamics of the system. The TDHF approach and some of its extensions are used to predict the evolution of out-of-equilibrium nuclear systems. The formation of di-nuclear systems with a structure close to molecular states is investigated. In particular, lifetimes and exit channels are described. The formation of light molecules and the dynamics of α-clustering are discussed. Di-nuclear systems formed in transfer, deep-inelastic, and quasi-fission reactions, as well as hyperheavy molecules produced in reactions between actinides are also investigated. The formation and stability of structures in neutron star crusts are finally discussed.

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Fusion and quasi-fission dynamics in nearly-symmetric reactions

Wang

Zhao

2015

Sci. China Phys. Mech. Astron.

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Some nearly-symmetric fusion reactions are systematically investigated with the improved quantum molecular dynamics (ImQMD) model. By introducing two-body inelastic scattering in the Fermi constraint procedure, the stability of an individual nucleus and the description of fusion cross sections at energies near the Coulomb barrier can be further improved. Simultaneously, the quasi-fission process in 154 Sm+ 160 Gd is also investigated with the microscopic dynamics model for the first time. We find that at energies above the Bass barrier, the fusion probability is smaller than 10 −5 for this reaction, and the nuclear contact-time is generally smaller than 1500 fm/c. From the central collisions of Sm+Gd, the neutron-rich fragments such as 164,165 Gd, 192 W can be produced in the ImQMD simulations, which implies that the quasi-fission reaction could be an alternative way to synthesize new neutron-rich heavy nuclei. * Electronic address: wangning@gxnu.edu.cn

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Dissipative dynamics in quasifission

Cited by 107 publications

References 64 publications

Shape evolution and collective dynamics of quasifission in the time-dependent Hartree-Fock approach

Shape evolution and collective dynamics of quasifission in the time-dependent Hartree-Fock approach

From Light to Hyper-heavy Molecules and Neutron-Star Crusts in a Dynamical Mean-Field Approach

Fusion and quasi-fission dynamics in nearly-symmetric reactions

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