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

doi:10.1103/PhysRevC.90.054613

	Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions
	Wen, Kai 1; Sakata, Fumihiko 1,2; Li, Zhu-Xia 3; Wu, Xi-Zhen 3; Zhang, Ying-Xun 3; Zhou, Shan-Gui 1,4,5
刊名	PHYSICAL REVIEW C
	2014-11-19
卷号	90
ISSN号	0556-2813
DOI	10.1103/PhysRevC.90.054613
文献子类	Article
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.
资助项目	Chinese Academy of Sciences (CAS) Visiting Professorship for Senior International Scientists[2013T1J0046]
WOS关键词	HEAVY-ION COLLISIONS ; ANTISYMMETRIZED MOLECULAR-DYNAMICS ; SUPERHEAVY NUCLEI ; DINUCLEAR SYSTEM ; HARTREE-FOCK ; BALANCE ENERGY ; DISSIPATION ; ELEMENTS ; FISSION ; BARRIER
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000345466300009
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/49401]
专题	中国科学院近代物理研究所
通讯作者	Wen, Kai
作者单位	1.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China 2.Ibaraki Univ, Inst Appl Beam Sci, Grad Sch Sci & Technol, Mito, Ibaraki 3108512, Japan 3.China Inst Atom Energy, Beijing 102413, Peoples R China 4.Natl Lab Heavy Ion Accelerator, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R China 5.Cent China Normal Univ, Ctr Nucl Matter Sci, Wuhan 430079, Peoples R China
推荐引用方式 GB/T 7714	Wen, Kai,Sakata, Fumihiko,Li, Zhu-Xia,et al. Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions[J]. PHYSICAL REVIEW C,2014,90.
APA	Wen, Kai,Sakata, Fumihiko,Li, Zhu-Xia,Wu, Xi-Zhen,Zhang, Ying-Xun,&Zhou, Shan-Gui.(2014).Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions.PHYSICAL REVIEW C,90.
MLA	Wen, Kai,et al."Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions".PHYSICAL REVIEW C 90(2014).