Antisymmetrized Molecular Dynamics

Horiuchi, Hisashi

doi:10.1007/978-1-4615-2516-5_18

Cited by 1 publication

(1 citation statement)

References 14 publications

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“…Besides these macroscopic transport models, many microscopic approaches like the time-dependent HartreeFock (TDHF) theory [15][16][17][18][19][20][21][22][23][24][25][26][27][28], the many-body correlation transport theory [29], and the quantum molecular dynamics (QMD) [30,31], the antisymmetrized molecular dynamics [32,33], and the fermion molecular dynamics [34] models have been developed. It is worthwhile mentioning that, among the TDHF approaches, there have been proposed new methods in recent years like the dissipative-dynamics (DD) TDHF [22,23] and the density-constrained (DC) TDHF [35,36] theories, which intend to explore how the macroscopic collective behavior of two colliding nuclei described by the Langevin-type equation appears as a result of huge dimensional micro- * sgzhou@itp.ac.cn scopic dynamics.…”

Section: Introductionmentioning

confidence: 99%

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

Wen

Sakata

et al. 2014

Phys. Rev. C

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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.

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