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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
2015
Source PublicationPHYSICAL REVIEW C
Volume91Issue:4Pages:
Subtype期刊文献
AbstractIncorporating 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.
KeywordNuclear Symmetry Energy Effective-mass Scattering Data Constraints Dependence Equation State Model Challenges Dynamics
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/24554
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
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):—.
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