Quantum molecular dynamics study of the mass distribution of products in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>7.0</mml:mn><mml:mi>A</mml:mi></mml:mrow></mml:math> MeV<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:mrow><mml:mo>+</mml:mo></mml:mrow><mml:mmultiscripts><mml:mi m

Zhao, Kai; Wu, X.; Li, Zhuxia

doi:10.1103/physrevc.80.054607

Cited by 32 publications

(37 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using the ImQMD model, the Coulomb barriers for many reaction systems were well described [9], the fusion excitation functions for a series of fusion reactions, including neutron-rich projectile and target reactions, were well reproduced [10], and the capture cross sections of 48 Ca + 208 Pb and 48 Ca + 238 U were also calculated [11] and compared with experimental data. The charge distribution of products in the central collisions of 197 Au + 197 Au at 35A MeV and the mass distribution of final fragments in 7.0A MeV 238 U + 238 U collisions were reproduced quite satisfactorily by the model [12,13]. Thus, the ImQMD model is appropriate to study the mechanism of the ternary breakup in Au + Au at 15A MeV.…”

Section: Introductionmentioning

confidence: 68%

See 1 more Smart Citation

Mechanism of ternary breakup in the reactionAu197+Au197at
Tian
¹
,
Wu
²
,
Li
³

et al. 2010
Phys. Rev. C
Self Cite

View full text Add to dashboard Cite

The mechanism of the ternary breakup of the very heavy system 197 Au + 197 Au at an energy of 15A MeV has been studied by using the improved quantum molecular dynamics model. The calculation results reproduce the characteristic features in ternary breakup events explored in a series of experiments; i.e., the masses of three fragments are comparable in size and the very fast, nearly collinear breakup of the colliding system is dominant in the ternary breakup events. Further, the evolution of the time scales of different ternary reaction modes and the behavior of mass distributions of three fragments with impact parameters are studied. The time evolution of the configurations of the composite reaction systems is also studied. We find that for most of the ternary breakup events with the features found in the experiments, the configuration of the composite system has two-preformed-neck shape. The study shows that those ternary breakup events having the characteristic features found in the experiments happen at relatively small impact parameter reactions, but not at peripheral reactions. The ternary breakup reaction at peripheral reactions belongs to binary breakup with a neck emission.

show abstract

Section: Introductionmentioning

confidence: 68%

“…The nuclear local interaction potential energy density functional V loc [ρ(r)] is the same as that in Refs. [10,12,13], which reads…”

Section: Brief Introduction Of the Imqmd Modelmentioning

confidence: 99%

Mechanism of ternary breakup in the reactionAu197+Au197at
Tian
¹
,
Wu
²
,
Li
³

et al. 2010
Phys. Rev. C
Self Cite

View full text Add to dashboard Cite

show abstract

“…Like in the original QMD model [30] and in various modern versions of QMD models [47][48][49][50][51][52][53][54], a trial wave function for a nucleus in the ImQMD model [55][56][57][58][59] is restricted within a parameter space {r j , p j }, where r j and p j are mean values of position and momentum operators of the jth nucleon expressed by a Gaussian wave packet, and the total wave function is a direct product of these wave functions of Gaussian form. With the aid of a Wigner transformation, a nucleus composed of distinguishable N nucleons is characterized by the following one-body phase space distribution function,…”

Section: A Imqmdmentioning

confidence: 99%

Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions

Wen

Sakata

et al. 2014

Phys. Rev. C

View full text Add to dashboard Cite

Applying a macroscopic reduction procedure on the improved quantum molecular dynamics (ImQMD) model, the energy dependences of the nucleus-nucleus potential, the friction parameter, and the random force characterizing a one-dimensional Langevin-type description of the heavy-ion fusion process are investigated. Systematic calculations with the ImQMD model show that the fluctuation-dissipation relation found in the symmetric head-on fusion reactions at energies just above the Coulomb barrier fades out when the incident energy increases. It turns out that this dynamical change with increasing incident energy is caused by a specific behavior of the friction parameter which directly depends on the microscopic dynamical process, i.e., on how the collective energy of the relative motion is transferred into the intrinsic excitation energy. It is shown microscopically that the energy dissipation in the fusion process is governed by two mechanisms: One is caused by the nucleon exchanges between two fusing nuclei, and the other is due to a rearrangement of nucleons in the intrinsic system. The former mechanism monotonically increases the dissipative energy and shows a weak dependence on the incident energy, while the latter depends on both the relative distance between two fusing nuclei and the incident energy. It is shown that the latter mechanism is responsible for the energy dependence of the fusion potential and explains the fading out of the fluctuation-dissipation relation.

show abstract

“…Note that lighter systems may also exhibit quasi-fission, although with a smaller probability. For instance, quasi-fission has been observed in 16 O, 32 S+ 238 U [12][13][14], and in 32 S+ 208 Pb [14].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the recent increase of computational power allowed microscopic descriptions of nuclear dynamics. For instance, systems as heavy as actinide collisions have been studied with microscopic approaches [30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Effects of nuclear structure on quasi-fission

Simenel

Wakhle

Avez

et al. 2012

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. The quasi-fission mechanism hinders fusion of heavy systems because of a mass flow between the reactants, leading to a re-separation of more symmetric fragments in the exit channel. A good understanding of the competition between fusion and quasi-fission mechanisms is expected to be of great help to optimize the formation and study of heavy and superheavy nuclei. Quantum microscopic models, such as the time-dependent Hartree-Fock approach, allow for a treatment of all degrees of freedom associated to the dynamics of each nucleon. This provides a description of the complex reaction mechanisms, such as quasi-fission, with no parameter adjusted on reaction mechanisms. In particular, the role of the deformation and orientation of a heavy target, as well as the entrance channel magicity and isospin are investigated with theoretical and experimental approaches.

show abstract

Quantum molecular dynamics study of the mass distribution of products in7.0A MeVU238+

Cited by 32 publications

References 22 publications

Mechanism of ternary breakup in the reactionAu197+Au197at
Tian
¹
,
Wu
²
,
Li
³

et al. 2010
Phys. Rev. C
Self Cite

Mechanism of ternary breakup in the reactionAu197+Au197at
Tian
¹
,
Wu
²
,
Li
³

et al. 2010
Phys. Rev. C
Self Cite

Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions

Effects of nuclear structure on quasi-fission

Contact Info

Product

Resources

About

Quantum molecular dynamics study of the mass distribution of products in7.0A MeVU238+

Cited by 32 publications

References 22 publications

Mechanism of ternary breakup in the reactionAu197+Au197atTian1, Wu2, Li3 et al. 2010Phys. Rev. CSelf Cite

Mechanism of ternary breakup in the reactionAu197+Au197atTian1, Wu2, Li3 et al. 2010Phys. Rev. CSelf Cite

Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions

Effects of nuclear structure on quasi-fission

Contact Info

Product

Resources

About

Mechanism of ternary breakup in the reactionAu197+Au197at
Tian
¹
,
Wu
²
,
Li
³

et al. 2010
Phys. Rev. C
Self Cite

Mechanism of ternary breakup in the reactionAu197+Au197at
Tian
¹
,
Wu
²
,
Li
³

et al. 2010
Phys. Rev. C
Self Cite