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核技术（英文版）
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2026年10期
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Light nuclei elliptic flow at mid-rapidity in √sNN=3.0-3.9 GeV Au+Au collisions using coalescence model
Light nuclei elliptic flow at mid-rapidity in √sNN=3.0-3.9 GeV Au+Au collisions using coalescence model
摘要
The collective flow of light nuclei is an important probe for understanding their production mechanisms in heavy-ion colli-sions.The STAR collaboration has reported that the atomic mass-number(A)scaling of light nuclei elliptic flow ν2 breaks down at √sNN=3.0-3.9 GeV.The observations reveal that,while protons maintain negative ν2 values at mid-rapidity for both 3.0 and 3.2 GeV,light nuclei ν2 exhibit a sign change from negative at 3.0 GeV to positive at 3.2 GeV.In this study,we investigate the ν2 of protons and deuterons in mid-central Au+Au collisions at √sNN=3.0,3.2,3.5 and 3.9 GeV using the JAM2 microscopic transport model.Deuterons are formed via nucleon coalescence,with the spatial distance ΔR and momentum difference ΔP between constituent nucleons serving as the coalescence criteria.Our calculations reproduce the sign change in deuteron ν2 at 3.2 GeV.We observe a pronounced dependence of the nucleon coalescence probability on the azimuthal angle relative to the reaction plane.This effect is primarily driven by the transverse momentum dependence of the mean spatial<ΔR>and momentum<ΔP>separations between nucleon pairs,which vary with the nucleon azimuthal angle.Moreover,our analysis indicates that the stiffness of the nuclear equation of state plays a crucial role in determining whether the sign change in deuteron ν2 occurs near √sNN=3.2 GeV.
年，卷(期)：
2026, 37(10)
机标分类号：
TQ0
R392.11
TP393.07
在线出版日期：
2026年10月16日
