Reexamination of the neutron-to-proton-ratio puzzle in intermediate-energy heavy-ion collisions

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	Reexamination of the neutron-to-proton-ratio puzzle in intermediate-energy heavy-ion collisions
	Kong, HY; Xia, Y; Xu, J; Chen, LW; Li, BA; Ma, YG
刊名	PHYSICAL REVIEW C
	2015
卷号	91 期号:4 页码:—
关键词	NUCLEAR SYMMETRY ENERGY EFFECTIVE-MASS SCATTERING DATA CONSTRAINTS DEPENDENCE EQUATION STATE MODEL CHALLENGES DYNAMICS
英文摘要	Incorporating a newly improved isospin- and momentum-dependent interaction in the isospin-dependent Boltzmann-Uehling-Uhlenbeck transport model IBUU11, we have investigated relative effects of the density dependence of nuclear symmetry energy E-sym(rho) and the neutron-proton effective mass splitting m(n)* - m(p)* on the neutron-to-proton ratio of free nucleons and those in light clusters. It is found that the m(n)* - m(p)* has a relatively stronger effect than the E-sym(rho) and the assumption of m(n)* <= m(p)* leads to a higher neutron-to-proton ratio. Moreover, this finding is independent of the in-medium nucleon-nucleon cross sections used. However, results of our calculations using the E-sym(rho) and m(n)* - m(p)* both within their current uncertainty ranges are all too low compared to the recent National Superconducting Cyclotron Laboratory double neutron-to-proton-ratio data from central Sn-124+Sn-124 and Sn-112+Sn-112 collisions at 50 and 120 MeV/u, thus calling for new mechanisms to explain the puzzlingly high neutron-to-proton ratio observed in the experiments.
收录类别	SCI
语种	英语
公开日期	2015-12-24
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/24554]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
推荐引用方式 GB/T 7714	Kong, HY,Xia, Y,Xu, J,et al. Reexamination of the neutron-to-proton-ratio puzzle in intermediate-energy heavy-ion collisions[J]. PHYSICAL REVIEW C,2015,91(4):—.
APA	Kong, HY,Xia, Y,Xu, J,Chen, LW,Li, BA,&Ma, YG.(2015).Reexamination of the neutron-to-proton-ratio puzzle in intermediate-energy heavy-ion collisions.PHYSICAL REVIEW C,91(4),—.
MLA	Kong, HY,et al."Reexamination of the neutron-to-proton-ratio puzzle in intermediate-energy heavy-ion collisions".PHYSICAL REVIEW C 91.4(2015):—.