首页|Nucleon effective mass splitting and density-dependent symmetry energy effects on elliptic flow in heavy ion collisions at Elab=0.09 ～ 1.5 GeV/nucleon

Nucleon effective mass splitting and density-dependent symmetry energy effects on elliptic flow in heavy ion collisions at Elab=0.09 ～ 1.5 GeV/nucleon

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By incorporating an isospin-dependent form of the momentum-dependent potential in the ultra-relativistic quantum molecular dynamics (UrQMD) model,we systematically investigate effects of the neutron-proton effective mass splitting m*n-p=m*n-m*p/ m and the density-dependent nuclear symmetry energy Esym(9) on the elliptic flow v2 in 197Au + 197Au collisions at beam energies from 0.09 to 1.5 GeV/nucleon.It is found that at higher beam energies (≥0.25 GeV/nucleon) with the approximately 75 MeV difference in slopes of the two different Esym(ρ),and the variation of m* ranging from-0.03 to 0.03 at saturation density with isospin asymmetry δ =(ρn-ρp)/ρ =0.2,the Esym(ρ) has a stronger influence on the difference in v2 between neutrons and protons,i.e.,vn2-vp2,than m*n-p has.Meanwhile,at lower beam energies (≤ 0.25 GeV/nucleon),v n2-vp2 is sensitive to both the Esym(ρ) and the m*n-p.Moreover,the influence of m*n-p on vn2-vp2 is more evident with the parameters of this study when using the soft,rather than stiff,symmetry energy.

nuclear symmetry energyheavy ion collisionelliptic flow

Luyao Tong、Pengcheng Li、Fupeng Li、Yongjia Wang、Qingfeng Li、Fanxin Liu

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Department of Physics, Zhejiang University of Technology, Hangzhou 310023, China

School of Science, Huzhou University, Huzhou 313000, China

School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China

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Supported in part by the National Natural Science Foundation of ChinaSupported in part by the National Natural Science Foundation of ChinaSupported in part by the National Natural Science Foundation of ChinaSupported in part by the National Natural Science Foundation of ChinaZhejiang Provincial Natural Science Foundation of ChinaZhejiang Provincial Natural Science Foundation of ChinaTen Thousand Talent Program of Zhejiang province

11875125119474101184731511505057LY18A050002LY19A0500012018R52017

2020

中国物理C(英文版)
中国物理学会　中国科学院高能物理研究所　中国科学院近代物理研究所

中国物理C(英文版)

CSTPCDCSCDSCI
影响因子：0.347
ISSN：1674-1137
年,卷(期)：2020.44(7)
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