Properties of the composite systems formed in the reactions of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>238</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>238</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998

Tian, Jing; Wu, X.; Zhao, Kai; Zhang, Yingxun; Li, Zhuxia

doi:10.1103/physrevc.77.064603

Cited by 95 publications

(79 citation statements)

References 33 publications

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“…The GRAZING has recently been extended to incorporate transfer-induced fission, which is referred to as GRAZING-F [26]. To describe damped collisions, a dynamical model based on Langevin-type equations [9][10][11][12][13][27][28][29][30], the dinuclear system (DNS) model [14][15][16][17][31][32][33][34][35][36][37][38], and the improved quantum molecular dynamics model (ImQMD) [39][40][41][42][43][44] have been extensively developed. Despite numerous successes in describing measurements, they are to some extent empirical, containing adjustable parameters.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent Hartree-Fock calculations for multinucleon transfer and quasifission processes in theNi64+U238reaction

2016

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Background: Multinucleon transfer (MNT) and quasifission (QF) processes are dominant processes in lowenergy collisions of two heavy nuclei. They are expected to be useful to produce neutron-rich unstable nuclei. Nuclear dynamics leading to these processes depends sensitively on nuclear properties such as deformation and shell structure.Purpose: We elucidate reaction mechanisms of MNT and QF processes involving heavy deformed nuclei, making detailed comparisons between microscopic time-dependent Hartree-Fock (TDHF) calculations and measurements for the 64 Ni+ 238 U reaction.Methods: Three-dimensional Skyrme-TDHF calculations are performed. Particle-number projection method is used to evaluate MNT cross sections from the TDHF wave function after collision.Results: Fragment masses, total kinetic energy (TKE), scattering angle, contact time, and MNT cross sections are investigated for the 64 Ni+ 238 U reaction. They show reasonable agreements with measurements. At small impact parameters, collision dynamics depends sensitively on the orientation of deformed 238 U. In tip (side) collisions, we find a larger (smaller) TKE and a shorter (longer) contact time. In tip collisions, we find a strong influence of quantum shells around 208 Pb.Conclusions: It is confirmed that the TDHF calculations reasonably describe both MNT and QF processes in the 64 Ni+ 238 U reaction. Analyses of this system indicate the significance of the nuclear structure effects such as deformation and quantum shells in nuclear reaction dynamics at low energies.

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Section: Introductionmentioning

confidence: 99%

Time-dependent Hartree-Fock calculations for multinucleon transfer and quasifission processes in theNi64+U238reaction

2016

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“…In recent years, the production of neutron-rich heavy and superheavy nuclei have been discussed by Zagrebaev and Greiner [14,15]. The multinucleon transfer processes are also investigated by the time-dependent HartreeFock (TDHF) approach [16,17] and improved quantum molecular dynamics (ImQMD) model [18]. The dinuclear system (DNS) model has been successfully used in investigating mechanisms of the synthesis of SHN in fusion reactions [19][20][21][22][23] and the transfer processes of the damped collisions [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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

Zhu

Feng

Zhang

2015

J. Phys. G: Nucl. Part. Phys.

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“…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%

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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Properties of the composite systems formed in the reactions ofU238+U238and
Jing Tian
¹
,
X. Wu
²
,
Kai Zhao
³

et al.

Cited by 95 publications

References 33 publications

Time-dependent Hartree-Fock calculations for multinucleon transfer and quasifission processes in theNi64+U238reaction

Time-dependent Hartree-Fock calculations for multinucleon transfer and quasifission processes in theNi64+U238reaction

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

Microscopic description of production cross sections including deexcitation effects

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Properties of the composite systems formed in the reactions ofU238+U238andJing Tian1, X. Wu2, Kai Zhao3 et al.

Cited by 95 publications

References 33 publications

Time-dependent Hartree-Fock calculations for multinucleon transfer and quasifission processes in theNi64+U238reaction

Time-dependent Hartree-Fock calculations for multinucleon transfer and quasifission processes in theNi64+U238reaction

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

Microscopic description of production cross sections including deexcitation effects

Contact Info

Product

Resources

About

Properties of the composite systems formed in the reactions ofU238+U238and
Jing Tian
¹
,
X. Wu
²
,
Kai Zhao
³

et al.