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

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	Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions
	Zhou, SG
刊名	PHYSICAL REVIEW C
	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
ISSN号	0556-2813
通讯作者	Wen, K (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
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.
学科主题	Physics
收录类别	SCI
资助信息	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]
原文出处	http://dx.doi.org/10.1103/PhysRevC.90.054613
语种	英语
WOS记录号	WOS:000345466300009
公开日期	2015-06-03
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15566]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Zhou, SG. Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions[J]. PHYSICAL REVIEW C,2014,90(5):54613.
APA	Zhou, SG.(2014).Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions.PHYSICAL REVIEW C,90(5),54613.
MLA	Zhou, SG."Energy dependence of the nucleus-nucleus potential and the friction parameter in fusion reactions".PHYSICAL REVIEW C 90.5(2014):54613.