Neutron density fluctuation and neutron-proton correlation from AMPT model

作者：Zhang, Zuman; Yu, Ning^*; Xu, Hongge

来源：European Physical Journal A, 2022, 58(12): 240.

DOI：10.1140/epja/s10050-022-00897-2

• LIGHT-NUCLEI PRODUCTION
• PHASE-DIAGRAM
• QCD

Using the multiphase transport (AMPT) model, we study the relative neutron density fluctuation and neutron- proton correlation in matter produced by Au + Au collisions at root s(NN) =7.7-200 GeV. The rapidity, centrality, and energy dependence of these two observations are also discussed. The light nuclei yield ratio of proton, deuteron, and triton NtNp/N-d(2) calculated directly from the relative neutron den-sity fluctuation and neutron-proton correlation, decreases with rapidity coverage and increases with collision centrality. Our study also found that the ratio does not exhibit any non-monotonic behavior in collision energy dependence. Since there is no first-order phase transition or critical physics in the AMPT model, our work provides a reference for extract-ing the relative neutron density fluctuation from light nuclei production in experiments.