Production of heavy neutron-rich nuclei in transfer reactions within the dinuclear system model

Zhu, Long; Feng, Zhao-Qing; Zhang, Feng-Shou

doi:10.1088/0954-3899/42/8/085102

Cited by 50 publications

(33 citation statements)

References 32 publications

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“…3 and 4 for the 40 Ca+ 208 Pb and 58 Ni+ 208 Pb reactions can be removed if one excludes contributions from small impact parameters, where the onset of mass equilibration process through a thick-neck formation and its breaking is observed [46]. However, all figures in the present paper 24 (-5p; P) 16 show cross sections obtained by integration over the full impact-parameter range, avoiding any ad hoc manipulation of the obtained results.…”

Section: Resultsmentioning

confidence: 97%

“…However, there exist discrepancies between the TDHF results and the experimental data. Namely, 24 (-5p; P) 16 latter originated from trajectories at small impact parameters accompanying large energy losses, where dynamics of a thick-neck formation and its breaking is responsible for the amount of nucleon transfer (see Ref. [46] for a detailed discussion).…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, different theoretical approaches have also been developed: e.g. a dynamical model based on Langevin-type equations of motion [5][6][7][8][9][10][11][12], dinuclear system model (DNS) [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], and improved quantum molecular dynamics model (ImQMD) [29][30][31][32][33][34][35][36][37][38]. Although those models can describe both peripheral and damped collisions, including fusion and quasifission (QF) processes, they are to some extent empirical containing model parameters.…”

Section: Introductionmentioning

confidence: 99%

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Microscopic description of production cross sections including deexcitation effects

Sekizawa

2017

Phys. Rev. C

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Background: At the forefront of the nuclear science, production of new neutron-rich isotopes is continuously pursued at accelerator laboratories all over the world. To explore the currently-unknown territories in the nuclear chart far away from the stability, reliable theoretical predictions are inevitable.Purpose: To provide a reliable prediction of production cross sections taking into account secondary deexcitation processes, both particle evaporation and fission, a new method called TDHF+GEMINI is proposed, which combines the microscopic time-dependent Hartree-Fock (TDHF) theory with a sophisticated statistical compoundnucleus deexcitation model, GEMINI++.Methods: Low-energy heavy ion reactions are described based on three-dimensional Skyrme-TDHF calculations. Using particle-number projection method, production probabilities, total angular momenta, and excitation energies of primary reaction products are extracted from the TDHF wavefunction after collision. Production cross sections for secondary reaction products are evaluated employing GEMINI++. Results are compared with available experimental data and widely-used GRAZING calculations. Results:The method is applied to describe cross sections for multinucleon transfer processes in MeV) reactions at energies close to the Coulomb barrier. It is shown that the inclusion of secondary deexcitation processes, which are dominated by neutron evaporation in the present systems, substantially improves agreement with the experimental data. The magnitude of the evaporation effects is very similar to the one observed in GRAZING calculations. TDHF+GEMINI provides better description of the absolute value of the cross sections for channels involving transfer of more than one protons, compared to the GRAZING results. However, there remain discrepancies between the measurements and the calculated cross sections, indicating a limit of the theoretical framework that works with a single mean-field potential. Possible causes of the discrepancies are discussed. Conclusions:In order to perfectly reproduce experimental cross sections for multinucleon transfer processes, one should go beyond the standard self-consistent mean-field description. Nevertheless, the proposed method will provide valuable information to optimize production mechanisms of new neutron-rich nuclei through its microscopic, non-empirical predictions.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microscopic description of production cross sections including deexcitation effects

Sekizawa

2017

Phys. Rev. C

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“…There are a bunch of models developed so far for the MNT study, such as the semi-classical model, like GRAZING [122,[205][206][207][208][209][210] or CWKB [117][118][119]211], the dinuclear system (DNS) model [212][213][214][215][216][217][218][219][220][221][222][223][224][225][226], the improved quantum molecular dynamics (ImQMD) model [227][228][229][230], and the Langevin model [131-140, 231, 232]. There are pros and cons in those approaches.…”

Section: E Remarks On Other Theoretical Approachesmentioning

confidence: 99%

TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: A Mini Review

Sekizawa

2019

Front. Phys.

106

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Time-dependent Hartree-Fock (TDHF) theory has been a powerful tool in describing a variety of complex nuclear dynamics microscopically without empirical parameters. In this contribution, recent advances in nuclear dynamics studies with TDHF and its extensions are briefly reviewed, along the line with the study of multinucleon transfer (MNT) reactions. The latter lies at the core of this Research Topic, whose application for production of extremely neutron-rich nuclei has been extensively discussed in recent years. Having in mind the ongoing theoretical developments, it is envisaged how microscopic theories may contribute to the future MNT study. 1 Here a local EDF (like Skyrme) has been assumed, which makes the TDHF equations (1) local in space, as it is currently used in most of practical applications. In general, E = E(r)dr is composed of various local densities, ξ ≡ {ρ, τ, . . . }, and the TDHF equations (1)In such a case, the single-particle Hamiltonian can have spin dependence as well as differential operators (for the explicit form, see, e.g., Refs. [27][28][29]).

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“…In Fig. 1, the calculated yields of heavy neutron-rich nuclei in the transfer reaction 176 Yb+ 238 U are shown [93]. The de-excitation process of primary fragments are treated with the GEM-INI code [94].…”

Section: A Dinuclear System (Dns) Modelmentioning

confidence: 99%

Production cross sections for exotic nuclei with multinucleon transfer reactions

Zhang

Zhu

et al. 2018

Front. Phys.

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Production of heavy neutron-rich nuclei in transfer reactions within the dinuclear system model

Abstract: Abstract. The dynamics of nucleon transfer processes in heavy-ion collisions is investigated within the dinuclear system model.

Cited by 50 publications

References 32 publications

Microscopic description of production cross sections including deexcitation effects

Microscopic description of production cross sections including deexcitation effects

TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: A Mini Review

Production cross sections for exotic nuclei with multinucleon transfer reactions

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