NZ-equilibration and nucleon exchange in dissipative heavy-ion collisions

Freiesleben, H.; Kratz, J. V.

doi:10.1016/0370-1573(84)90092-9

Cited by 145 publications

(78 citation statements)

References 161 publications

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“…(ii) Furthermore, it is very instructive and useful to compare these transport coefficients extracted from the SMF approach with those familiar from the phenomenological nucleon exchange models, which were developed and applied to analyzed experimental data some years ago [16,27,28]. In previous works [19][20][21], we carried out such an investigation of nucleon exchange mechanism for central collisions.…”

Section: Nucleon Transfer In Deep-inelastic Collisionsmentioning

confidence: 99%

Nucleon exchange in heavy-ion collisions within a stochastic mean-field approach

et al. 2014

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Nucleon exchange mechanism is investigated in deep-inelastic symmetric heavy-ion collisions in the basis of the Stochastic Mean-Field approach. By extending the previous work to off-central collisions, analytical expression is deduced for diffusion coefficient of nucleon exchange mechanism. Numerical calculations are carried out for 40 Ca + 40 Ca and 90 Zr + 90 Zr systems and the results are compared with the phenomenological nucleon exchange model. Also, calculations are compared with the available experimental results of deep-inelastic collisions between calcium nuclei.

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Section: Nucleon Transfer In Deep-inelastic Collisionsmentioning

confidence: 99%

Nucleon exchange in heavy-ion collisions within a stochastic mean-field approach

et al. 2014

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“…Over many years experimental data have been measured in the field of deep inelastic heavy ion collisions [71,72]. The characteristic feature of these collisions is the binary character of the system, i.e.…”

Section: Charge Equilibration In Deep Inelastic Reactionsmentioning

confidence: 99%

Open Quantum Systems

Исар

Săndulescu

Scutaru

et al. 1994

Int. J. Mod. Phys. E

197

232

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The damping of the harmonic oscillator is studied in the framework of the Lindblad theory for open quantum systems. A generalization of the fundamental constraints on quantum mechanical diffusion coefficients which appear in the master equation for the damped quantum oscillator is presented; the Schrödinger, Heisenberg and Weyl-WignerMoyal representations of the Lindblad equation are given explicitly. On the basis of these representations it is shown that various master equations for the damped quantum oscillator used in the literature are particular cases of the Lindblad equation and that not all of these equations are satisfying the constraints on quantum mechanical diffusion coefficients. Analytical expressions for the first two moments of coordinate and momentum are obtained by using the characteristic function of the Lindblad master equation. The master equation is transformed into Fokker-Planck equations for quasiprobability distributions and a comparative study is made for the Glauber P representation, the antinormal ordering Q representation and the Wigner W representation. The density matrix is represented via a generating function, which is obtained by solving a time-dependent linear partial differential equation derived from the master equation. Illustrative examples for specific initial conditions of the density matrix are provided. The solution of the master equation in the Weyl-Wigner-Moyal representation is of Gaussian type if the initial form of the Wigner function is taken to be a Gaussian corresponding (for example) to a coherent wavefunction. The damped harmonic oscillator is applied for the description of the charge equilibration mode observed in deep inelastic reactions. For a system consisting of two harmonic oscillators the time dependence of expectation values, Wigner function and Weyl operator are obtained and discussed. In addition models for the damping of the angular momentum are studied. Using this theory to the quantum tunneling through the nuclear barrier, besides Gamow's transitions with energy conservation, additional transitions with energy loss, are found. The tunneling spectrum is obtained as a function of the barrier characteristics. When this theory is used to the resonant atom-field interaction, new optical equations describing the coupling through the environment of the atomic observables are obtained. With these equations, some characteristics of the laser radiation absorption spectrum and optical bistability are described.

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“…However, difficulties exist in modeling these reactions due to their timedependent non-equilibrium nature. The portioning of excitation energy between the final fragments [3,[24][25][26], the amount of irreversible energy dissipation as opposed to excitation of collective modes, conversion of angular momentum to intrinsic spins of the final fragments [27], influence of transfer [23,28,29] have all been subject to experimental [15,[30][31][32] scrutiny with often less than satisfactory comparisons [3,33]. Part of the complication arises from the model dependence of the experimental analysis.…”

Section: Introductionmentioning

confidence: 99%

Transport properties of isospin asymmetric nuclear matter using the time-dependent Hartree-Fock method

Umar

Simenel

2017

Phys. Rev. C

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Background: The study of deep-inelastic reactions of nuclei provide a vehicle to investigate nuclear transport phenomena for a full range of equilibration dynamics. These inquires provide us the ingredients to model such phenomena and help answer important questions about the nuclear Equation of State (EOS) and its evolution as a function of neutron-to-proton (N/Z) ratio.Purpose: The motivation is to examine the real-time dynamics of nuclear transport phenomena and its dependence on (N/Z) asymmetry from a microscopic point of view to avoid any pre-conceived assumptions about the involved processes.Method: Time-dependent Hartree-Fock (TDHF) method in full 3D is employed to calculate deep-inelastic reactions of 78 Kr+ 208 Pb and 92 Kr+ 208 Pb systems at 8.5 MeV/A. The impact parameter and energy-loss dependence of relevant observables are calculated. In addition, density constrained TDHF method is used to compute excitation energies of the primary fragments. The statistical deexcitation code GEMINI is utilized to examine the final reaction products.Results: The kinetic energy loss and sticking times as a function of impact parameter are calculated. Final properties of the fragments (charge, mass, scattering angle, kinetic energy) are computed. Their evolution as a function of energy loss is studied and various intra-relations are investigated. The fragment excitation energy sharing is computed. Conclusions:We find a smooth dependence of the energy loss, E loss , on the impact parameter for both systems. On the other hand the transfer properties for low E loss values are very different for the two systems but become similar in the higher E loss regime. The mean life time of the charge equilibration process, obtained from the final (N − Z)/A value of the fragments, is shown to be ∼ 0.5 zs. This value is slightly larger (but of the same order) than the value obtained from reactions at Fermi energies.

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NZ-equilibration and nucleon exchange in dissipative heavy-ion collisions

Cited by 145 publications

References 161 publications

Nucleon exchange in heavy-ion collisions within a stochastic mean-field approach

Nucleon exchange in heavy-ion collisions within a stochastic mean-field approach

Open Quantum Systems

Transport properties of isospin asymmetric nuclear matter using the time-dependent Hartree-Fock method

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