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Utilizing the PYTHIA8 Angantyr model, which incorporates the multiple-partoninteractions (MPI) based color reconnection (CR) mechanism, we study therelative neutron density fluctuation and neutron-proton correlation in Au+Aucollisions at $\sqrt{s_\text{NN}}$ = 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and200 GeV. In this study, we have not only delved into the dependence of thesetwo remarkable observations on rapidity, centrality, and energy, but alsopresented an analysis of their interplay with the MPI and CR. Our results haveshown that the light nuclei yield ratio of proton, deuteron, and triton,expressed by the elegant expression $N_tN_p/N_d^2$, remains unchanged even asthe rapidity coverage and collision centrality increase. Interestingly, we havealso revealed that the effect of CR is entirely dependent on the presence ofMPI; CR has no impact on the yield ratio if MPI is off. Our findings furtherdemonstrate that the light nuclei yield ratio experiences a slight increasewith increasing collision energy as predicted by the PYTHIA8 Angantyr model,but it cannot describe the non-monotonic trend observed by the STAR experiment.Based on the Angantyr model simulation results, it is essential not to overlookthe correlation between neutron and proton fluctuations. The Angantyr model isa good baseline for studying collisions in the absence of a Quark-Gluon Plasma(QGP) system, given its lack of flow and jet quenching.

Study of neutron density fluctuation and neutron-proton correlation in Au+Au collisions using PYTHIA8/Angantyr