Characteristics of quasifission products within the dinuclear system model

Adamian, G. G.; Antonenko, N. V.; Scheid, W.

doi:10.1103/physrevc.68.034601

Cited by 219 publications

(172 citation statements)

References 60 publications

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“…During the long contact times many nucleon exchanges take place between projectile and target nuclei. A number of models are developed for a description of the reaction mechanism in the quasi-fission process [8][9][10]. In a recent work, the quasi-fission mechanism in 40 Ca + 238 U and 48 Ca + 238 U collisions was investigated in the mean-field approach of the time-dependent Hartree-Fock theory by Oberacker et al [11].…”

Section: Introductionmentioning

confidence: 99%

Multinucleon exchange in quasifission reactions

2015

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Nucleon exchange mechanism is investigated in the central collisions of 40 Ca + 238 U and 48 Ca + 238 U systems near the quasi-fission regime in the framework of the Stochastic Mean-Field (SMF) approach. Sufficiently below the fusion barrier, di-nuclear structure in the collisions is maintained to a large extend. Consequently, it is possible to describe nucleon exchange as a diffusion process familiar from deep-inelastic collisions. Diffusion coefficients for proton and neutron exchange are determined from the microscopic basis of the SMF approach in the semi-classical framework. Calculations show that after a fast charge equilibration the system drifts toward symmetry over a very long interaction time. Large dispersions of proton and neutron distributions of the produced fragments indicate that diffusion mechanism may help to populate heavy trans-uranium elements near the quasi-fission regime in these collisions.

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Section: Introductionmentioning

confidence: 99%

Multinucleon exchange in quasifission reactions

2015

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“…Most dynamical models [13][14][15][16][17][18][19] argue that, for heavy systems, a dinuclear complex is formed initially and the barrier structure and the excitation energy of this precompound system determine its survival to breaking up via quasi-fission. Furthermore, if the nucleus survives this initial state and evolves to a compound system, it can still fission due to its excitation.…”

Section: Introductionmentioning

confidence: 99%

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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“…During the long contact times many nucleon exchanges take place between projectile and target nuclei. A number of models was developed for a description of the reaction mechanism in the multi-nucleon transfer process in quasi-fission reactions [1][2][3][4]. Within the last few years the time-dependent Hartree-Fock (TDHF) approach [5][6][7] has been utilized for studying the dynamics of quasifission [7][8][9][10][11][12][13][14][15][16][17] and scission dynamics [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Multinucleon transfer in central collisions of U238+U238

et al. 2017

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Quantal diffusion mechanism of nucleon exchange is studied in the central collisions of 238 U + 238 U in the framework of the stochastic mean-field (SMF) approach. For bombarding energies considered in this work, the di-nuclear structure is maintained during the collision. Hence, it is possible to describe nucleon exchange as a diffusion process for mass and charge asymmetry. Quantal neutron and proton diffusion coefficients, including memory effects, are extracted from the SMF approach and the primary fragment distributions are calculated.

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Characteristics of quasifission products within the dinuclear system model

Cited by 219 publications

References 60 publications

Multinucleon exchange in quasifission reactions

Multinucleon exchange in quasifission reactions

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

Multinucleon transfer in central collisions of U238+U238

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