Nucleon-nucleon cross sections in neutron-rich matter and isospin transport in heavy-ion reactions at intermediate energies

doi:10.1103/PhysRevC.72.064611

	Nucleon-nucleon cross sections in neutron-rich matter and isospin transport in heavy-ion reactions at intermediate energies
	Li, BA ; Chen, LW
刊名	PHYSICAL REVIEW C
	2005-12-01
卷号	72 页码:12
ISSN号	0556-2813
DOI	10.1103/PhysRevC.72.064611
英文摘要	Nucleon-nucleon (NN) cross sections are evaluated in neutron-rich matter using a scaling model according to density, momentum, and isospin dependent nucleon effective masses. It is found that the in-medium NN cross sections are not only reduced but also have a different isospin dependence compared with the free-space ones. Because of the neutron-proton effective mass splitting the difference between nn and pp scattering cross sections increases with the increasing isospin asymmetry of the medium. Within the transport model IBUU04, the in-medium NN cross sections are found to influence significantly the isospin transport in heavy-ion reactions. With the in-medium NN cross sections, a symmetry energy of E(sym)(rho) approximate to 31.6(rho/rho(0))(0.69) was found most acceptable compared with both the MSU isospin diffusion data and the presently acceptable neutron-skin thickness in (208)Pb. The isospin dependent part K(asy)(rho(0)) of isobaric nuclear incompressibility was further narrowed down to -500 +/- 50 MeV. The possibility of determining simultaneously the in-medium NN cross sections and the symmetry energy was also studied. The proton transverse flow, or even better the combined transverse flow of neutrons and protons, can be used as a probe of the in-medium NN cross sections without much hindrance from the uncertainties of the symmetry energy.
WOS关键词	EFFECTIVE-MASS ; MEAN-FIELD ; MICROSCOPIC CALCULATION ; COLLECTIVE FLOW ; COLLISIONS ; DEPENDENCE ; EQUATION ; MOMENTUM ; STATE ; DISAPPEARANCE
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000234337400057
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/25058]
专题	中国科学院近代物理研究所
通讯作者	Li, BA
作者单位	1.Arkansas State Univ, Dept Chem & Phys, State Univ, AR 72467 USA 2.Shanghai Jiao Tong Univ, Inst Theoret Phys, Shanghai 200240, Peoples R China 3.Natl Lab Heavy Ion Accelerator, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Li, BA,Chen, LW. Nucleon-nucleon cross sections in neutron-rich matter and isospin transport in heavy-ion reactions at intermediate energies[J]. PHYSICAL REVIEW C,2005,72:12.
APA	Li, BA,&Chen, LW.(2005).Nucleon-nucleon cross sections in neutron-rich matter and isospin transport in heavy-ion reactions at intermediate energies.PHYSICAL REVIEW C,72,12.
MLA	Li, BA,et al."Nucleon-nucleon cross sections in neutron-rich matter and isospin transport in heavy-ion reactions at intermediate energies".PHYSICAL REVIEW C 72(2005):12.