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题名: Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions
作者: Wen, K ;  Sakata, F ;  Li, ZX ;  Wu, XZ ;  Zhang, YX ;  Zhou, SG
刊名: PHYSICAL REVIEW C
出版日期: 2014
卷号: 90, 期号:5, 页码:54613
关键词: HEAVY-ION COLLISIONS ;  ANTISYMMETRIZED MOLECULAR-DYNAMICS ;  SUPERHEAVY NUCLEI ;  DINUCLEAR SYSTEM ;  HARTREE-FOCK ;  BALANCE ENERGY ;  DISSIPATION ;  ELEMENTS ;  FISSION ;  BARRIER
学科分类: Physics
DOI: 10.1103/PhysRevC.90.054613
通讯作者: Wen, K (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
部门归属: [Wen, Kai
英文摘要: Applying a macroscopic reduction procedure to 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 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.
资助者: National Key Basic Research Program of China [2013CB834400]; National Natural Science Foundation of China [11075215, 11121403, 11120101005, 11275052, 11275248, 11375062]; Knowledge Innovation Project of the Chinese Academy of Sciences [KJCX2-EW-N01]; Chinese Academy of Sciences (CAS) Visiting Professorship for Senior International Scientists [2013T1J0046]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000345466300009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15566
Appears in Collections:理论物理所2014年知识产出 _期刊论文

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Recommended Citation:
Wen, K,Sakata, F,Li, ZX,et al. Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions[J]. PHYSICAL REVIEW C,2014,90(5):54613.
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