CPOD2022 - Workshop on Critical Point and Onset of Deconfinement

Spinodal Enhancement of Light Nuclei Yield Ratio in Relativistic Heavy Ion Collisions

1 Dec 2022, 17:30

20m

Neutron Stars and very high $m{u}_B$ - 1

Speaker

开佳 孙

Description

Using a relativistic transport model to describe the evolution of the quantum chromodynamic matter produced in Au+Au collisions at $\sqrt{s_{NN}}=3-200$ GeV, we study the effect of a first-order phase transition in the equation of state of this matter on the yield ratio $N_t{N}_p/N_d^2$ ($tp/d^2$) of produced proton ($p$), deuteron ($d$), and triton ($t$). We find that the large density inhomogeneities generated by the spinodal instability during the first-order phase transition can survive the fast expansion of the subsequent hadronic matter and lead to an enhanced $tp/d^2$ in central collisions at $\sqrt{s_{NN}}=3-5$~GeV as seen in the experiments by the STAR Collaboration and the E864 Collaboration. However, this enhancement subsides with increasing collision centrality, and the resulting almost flat centrality dependence of $tp/d^2$ at $\sqrt{s_{NN}}=3$ GeV can also be used as a signal for the first-order phase transition.

Presentation materials

CPOD2022_Spinodal-KaiJia Sun.pdf