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Properties of the composite systems formed in the reactions of (238)U+(238)U and (232)Th+(250)Cf
Tian, Junlong; Wu, Xizhen; Zhao, Kai; Zhang, Yingxun; Li, Zhuxia; Tian, JL , Beijing Normal Univ, Inst Low Energy Nucl Phys, Beijing 100875, Peoples R China
2008
发表期刊PHYSICAL REVIEW C
ISSN0556-2813
卷号77期号:6页码:-
摘要Strongly damped reactions of (238)U+(238)U, (232)Th+(250)Cf at E(c.m.)=680-1880 MeV have been studied based on the improved quantum molecular dynamics model. The formation and properties of the transiently formed composite system during the reaction process are carefully studied. We find that at a certain energy region, the entrance channel potential is weakly repulsive, and the dissipation is very strong after touching configuration. These two effects delay the re-separation time for a composite system. The single-particle potential well of the transiently formed composite system has a Coulomb barrier about 15-20 MeV high at the surface, which causes the excited unbound protons still embedded in the potential well to move in a common mono-single-particle potential for a period of time and thus restrains the quick decay of the composite system. The incident-energy dependence of the lifetime of the composite system and how the lifetime correlates with the shape configuration, the momentum distribution of the composite system, and the angular distribution of primary fragments are carefully investigated. The results indicate that the longest average lifetime for the transient composite system of U+U can reach about 1200 fm/c at properly selected incident energies.
部门归属[Tian, JL; Wu, XZ; Zhao, K; Zhang, YX; Li, ZX] China Inst Atom Energy, Beijing 102413, Peoples R China; [Li, ZX] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
关键词Heavy-ion Collisions Molecular-dynamics Shell-model Superheavy Elements Fragment Formation Fusion-fission U-238 Nuclei Search Decay
学科领域Physics
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收录类别SCI
WOS记录号WOS:000257290000039
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被引频次:42[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5520
专题理论物理所1978-2010年知识产出
通讯作者Tian, JL , Beijing Normal Univ, Inst Low Energy Nucl Phys, Beijing 100875, Peoples R China
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Tian, Junlong,Wu, Xizhen,Zhao, Kai,et al. Properties of the composite systems formed in the reactions of (238)U+(238)U and (232)Th+(250)Cf[J]. PHYSICAL REVIEW C,2008,77(6):-.
APA Tian, Junlong,Wu, Xizhen,Zhao, Kai,Zhang, Yingxun,Li, Zhuxia,&Tian, JL , Beijing Normal Univ, Inst Low Energy Nucl Phys, Beijing 100875, Peoples R China.(2008).Properties of the composite systems formed in the reactions of (238)U+(238)U and (232)Th+(250)Cf.PHYSICAL REVIEW C,77(6),-.
MLA Tian, Junlong,et al."Properties of the composite systems formed in the reactions of (238)U+(238)U and (232)Th+(250)Cf".PHYSICAL REVIEW C 77.6(2008):-.
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